3. One leads to the oil pump and one leads to the carburetor. See if the side covers are still installed. Most of the parts for the QT50 are still available from Yamaha dealers. Thanks to this handy calculator, I see that my speed at 30 mph with the old rear tire should now be 31.53 mph. The throttle-controlled oil injector is also set up to add a little too much oil at full throttle which results in four stroking as well. The original tire size on the qt50 is 2.25 wide by 14 in diameter. Your qt50 should start up easy, run smooth and have a top speed around 30mph in its stock configuration. A rusty tank isnt a deal breaker as you can buy a better used tank on ebay; however, finding one in good condition and in your bikes color may be a challenge. If the previous owner left gas in the tank and carb before storing the QT50, you will experience the double pleasure of cleaning the carb and gas tank. Install a free-flowing air filter; The VM18 will require MLM's intake designed for the VM18. Call 563-359-7222. Of course, youll need to change your main jet to a bigger one to compensate for the additional air (you need to keep your fuel/air ratio similar if you add more air, you need to add more fuel). 2. -DO NOT CONTACT ME. At full throttle, the bad seals may let in so much air that it causes your bike to die. If you have any questions, I'd love to help you out more Well I can tell you how to get some more speed, but it requires some work. If it does not, your compression will suffer. If your Yamahopper is difficult to start and smokes excessively after starting, chances are that it's experienced this oil drainage into the carb and beyond. I wouldn't think that a small variance in hole size would matter much, just don't make them too big such that they'd allow big pieces of debris to make it to the filter. Day 1 - 49cc engine is on my blue qt50. Just like too much gas, too much oil can cause the engine to four stroke. Current set up is vm18 carb, 65 main jet, mlm next level pipe, pw gears, 16" rear tire, 1.0mm spacer. Install a new and bigger rear tire. Do this little by little in combination with PB-Blaster. Needs both tires subtract $95-105; So the caveat here is just because it runs and rides well doesnt mean you are home free. The stock main jet in a qt50 is a 70. The next easiest thing that you can do is slap on an expansion chanber. Ive had the stock cylinder slightly over 400 before. Yamaha QT50 Cables & Brackets. A popular choice is the IRC NR-77 moped tire: 14 x 70/90. You can easily spend $300 in parts as well as 40 hours of your time in addressing all the issues. You more than likely over-jetted. Makes me wonder how anyone could really go fast with a stock head. Check the header on your exhaust and determine whether it is an "S" shape between the flange and silencer or more of a straight shot between the two. Or fastest delivery Jan 20 - 24 . Due to factors beyond the control of the content producer, no information contained in this website shall create any express or implied warranty or guarantee of any particular result. This setup requires no maintenance and has the safety feature of lacking any exposed moving parts such as a chain that could catch one's clothing. Re: 1982 Yamaha QT50 Yamahopper top speed. I never ran into overheating problems, nor did I ever have a mechanical breakdown because I kept up on its maintenence. Commentaire fait aux tats-Unis le 10 novembre 2019. Chances are your tires on your 35 or so year old qt50 are a mess. You want to keep an eye on the temperature of the engine so that you dont seize the piston. In 2018, MLM introduced the MLM yamaha QT50 techno EDM circuit pipe. Universal Rubber Sleeve by Motion Pro. Better a fouled spark plug than a seized piston, right? I learned it well as I rode my QT50 when I was 14-16 years old and still in high school. A 28 or 29mm air filter will fit on the stock Mikuni VM12 carburetor. Your QT50 is just getting too much gas and oil. The Yamahopper has an approximate top speed of 30 mph in stock form, and thus can be used for city driving. On a large ride, I was able to keep up with the Puch's and Carabela's. Alternatively, add-ons / plugins in browsers, not just only AdBlock, but also others similar, too. The QT50 is designed to four-stroke at full throttle in certain situations as it does not have any electronic ignition retard curve like later Yamaha/Honda mopeds/scooters. Expect a top speed gain of at least 10% over stock with this modification. I also read on mopedarmy.com (concerning the Suzuki FA50) that if you went from 20W-40 conventional oil to 10W-30 synthetic oil, you would obtain a 2-4 mph top speed increase. Titled and ready to go. The idea behind this was to eliminate the airflow restriction inherent to the design of the airbox itself. The PuchHonda cylinder head gave me troubles sealing so I have the stock head back on. Thats an almost 2 mph increase by just changing the rear tire. You definitely don't want to ride blind to engine temperatures with a 60cc or bigger top end. This headlight has a replaceable bulb and fits perfectly in the QT50's headlight ring. Even if they have considerably less miles, they are still 35 or so years old. $650 in Ohio may be the same as $900 in California or New York. For Cable Housing. Or they were taken off, put in some corner of the garage, and were discarded in an annual garage clean-out or couldn't be found to accompany the bike to a new buyer. Cylinder Piston Gasket Head Set Fits Yamaha PW50 (1981-2018) Bore 40mm. If it goes slower than this, negotiate accordingly. Prices vary throughout the country. The simplified driveshaft setup makes wheel changes easy. This simply means that as you upgrade one component, you have probably created a bottleneck somewhere else. 99. My initial acceleration may be a bit slower with the bigger rear tire. Im looking at a QT50 that Im thinking about buying. It four-strokes fairly easily in the stock configuration so that you don't overheat and soft-seize under low load at full throttle. Want to post in this forum? Mlm next level pipe is not too impressive. Check and see if all the lights and horn work. A complete PW50 stator can be had for less than $20. A small diameter wire is an effective cleaning tool when attempting to clear the idle jet of whatever crud that has narrowed its passageway. I solved it by going from a 102.5 jet to an 87 and finally to an 85 main jet. Or you can find a hose or fuel line that offers a compromise between the different sizes of the oil injection inlet and outlet ports and connect the two to continuously cycle a small amount of oil through the pump while running premix in the fuel tank. To combat this, many riders have eliminated the oil pump and replaced it with an oil plate block-off or an automotive freeze plug. Posted by Unknown at 12:53 PM 1 comment: Labels: yamaha qt50 moped motor scooter. Adjust your throttle stop screw and your idle air screw on your carb; For only $99, it offers better flow and performance than an old stock pipe and is priced only slightly higher than most used stock pipes that you may find on eBay or elsewhere. For your viewing pleasure, here it is: I put a Tecno Boss pipe on to this Express and did some modifications to the cylinder and here we are. The immediate goal is to break 40 and then shoot for 45 mph. The puch head keeps her cool. Having fun on the Yamaha qt50 AboutPressCopyrightContact. What you are experiencing is a phenomenon known as four-stroking. I had cyclekeysonline make me a $10 key for it and it worked. Re: I got manuals for yall on the net for FREE. South of the gas tank is the resting place of the qt's petcock. The oil pump is reputed to add excessive amounts of two stroke oil to the fuel. Although unlikely that any significant difference exists, the straighter version contributed more to performance than the "S" shaped version. Ok, so I put a DR kit on the Orange Express. So if my qt50 can spin the taller tire at the same revolutions per minute my speed should increase. For every 1 mph below top speed of 30 mph, subtract $15-20; This does not mean that all four stroking is bad. It also seems to help if you reconnect the common ground shared between the charge coil and the light coil. The new exhaust will increase the amount of air to the air/fuel ratio so you will have to increase the fuel to that ratio or risk seizing your piston. Rinse and repeat several times. Be nice to her. Manufactured. And Im happy to buy a non-runner because you often have to put as much into a running bike as a non-running bike. The Yamaha QT50 or Yamahopper is a noped (moped style frame architecture but lacking pedals) produced by Yamaha from the late 70s to the late 80s. The QT50 drive train was shared by the Tri-Zinger and PW50. 2 stroke engines are designed to four stroke in certain situations. What should you pay for (or sell) a Honda Express? Another option is to obtain a headlight for a Honda C70. Ron Peek / yamahauler. Subscribe to: Posts (Atom) In its factory form, the Yamaha QT50 should reach a top speed of around 28-30 mph. New and used parts are often found on eBay as well. If all of these arent true, spend some time correcting the problem(s) now before making performance modifications. Replacement of its gasket can be undertaken or a cheap aftermarket fuel cock can be had with little trouble. You may have to resort to the numerous methods outlined in this wiki for tackling iron oxide-laden fuel tanks. In addition 60cc top ends are prevalent on ebay and amazon. 5,0 sur 5 toiles Works great. I achieved a top speed of 39.7mph which I consider amazing on a stock cylinder. Categories. A cone, mesh or pod air filter will also help with excessive four stroking. Pull off the battery cover and check out the wiring in the back as well. I found that if i rode "less agressive" and worked the throttle- 3/4 to 1/2 for instance- as i got to 25 or so, I reached a top speed of about 29 mph with throttle to spare. . I probably have more if I dig around. yamaha qt50 big bore party pack with pretty much all the stuff you need! Day 1 49cc engine is on my blue qt50. Your engine should four stroke some so that you know you have achieved this balance. This leads to hacking into the wiring. At 70mm wide or 2.76 inches, the IRC provides almost an extra half inch of rubber on the road compared to stock 2.25" tires. Try a slightly smaller main jet; Due to factors beyond the control of the content producer, no information contained in this website shall create any express or implied warranty or guarantee of any particular result. Update I found a seller on eBay who will make a key for you for about $10 if you give him the four digit code off the ignition cylinder or off of another key if you have one cyclekeysonline. Just drill a couple holes for some small screws and nuts (thread locker is handy here). Prices vary throughout the year with the change of seasons. Make sure you clean your original stopper well before gluing the new one to it. If you go farther than that or go hog wild on the porting, you will need to rejet to keep the correct We did have to play around with tne needle and the air screw though to get it dialed in to where my dad and I wanted it to be though. Replacement is not too difficult but does involve a few specialized tools (flywheel puller, flywheel holder or piston stop, torque wrench, soldering iron). Want to post in this forum? Overheating and piston seizure are traps for the unwary. Because I opened up the reed block slightly, a 2.5 increase in jet size is significant. 1. Mine changes gears . Try an 80 or 85 main jet. Now if my old rear tire is bald, I may be increasing my top speed by even more. The temperature gauge will be your other. Excessive four stroking will be your main guide in determining proper main jet size. I notice sometimes at full throttle it will run rougher, make a different noise, seem to hesitate and check up. My Yamaha QT50 . My top speed now is somewhere around 28 mph. Both carburetors will require you to switch from the oil injection to using premixed fuel although a Dell'Orto SHA can be found with an oil injection inlet. Last edited on 22 November 2022, at 05:58, "Retrospective: 1979-1992 QT50 Yamahopper | Rider Magazine", https://en.wikipedia.org/w/index.php?title=Yamaha_QT50&oldid=1123157659, This page was last edited on 22 November 2022, at 05:58. They just need to make the cylinder "breathe" better at mid/high RPM. Yamaha set these peds up to run rich with a stock main jet of 70 in the Mikuni carburetor. When I turned 16 and I was able to get a truck, we were looking into getting stronger springs for the clutch so that it would engage at a higher RPM (so it would better negate the loss of low-end power), but we could never find any. To see our full inventory go to brennys dot com. Ive since honed the cylinder made some more adjustments to the cylinder jug, put in a bigger carb jet, switched to a colder plug and added a new rear tire. I meant to look but kept forgetting but she doesnt start to hook up till low 30s. Noped Thursday 2.03K subscribers Subscribe 3.7K views 4 years ago Some further tweaks yet but 49.1 mph. Youll need to increase the size of the main jet when you do this. I used a 65 main jet and it seems to be pretty dialed in. Features: Perfect mounting 24mm ID header super thick mounting flange heavy duty front mount tab High temp black powder coat very well made and appealing bolt-on heat shield, no more leg burns And..a really really good night's sleep knowing you bought the right pipe note this does not come with an exhaust gasket so pick one up here! The other 2 wires are power for lights or battery. If you lose the oil pump, you also lose some of that snap-back tension. What you are really experiencing is the engine four stroking as a result of too much fuel in the combustion chamber. The wires from your QT motor are: https://www.mopedarmy.com/w/index.php?title=Yamaha_QT50&oldid=27436. Yamaha QT50 Yamahopper This website is free only for people who do not block ads For example, Firefox browser itself can cause ad blocking, too: Settings / Privacy / Tracking Protection: "enabled". Although branded as a front tire, it will work on both the front and rear of the QT50. seat is beat up subtract $40; QT know's she isn't fast, but she'll give you all she's got if you just let her do her stuff. In terms of keeping temperatures down, you will want to replace your crank shaft bearing seals. 5. The engine needs more fuel going uphill because it is under a bigger load. Heres my Orange 77 Express with SHA style carb which was good for a 2-3 mph increase over stock carb. Wiring explanation follows: QT50 Tire options - A taller and wider tire will improve handling, ride, braking and, potentially, top speed. Available at Brennys Motorcycle Clinic in Bettendorf, Ia. That extra bit of fuel that causes some four stroking is required by the engine when it is under greater loads like climbing hills, running into a strong wind, etc. Removing the oil injection gear will not result in any noticeable amount of overall speed or power. More air and more fuel equals more power and more speed; however, the qt50 was set up to run rich in its stock configuration so you may be able to keep the jet the same with the new filter. Unfortunately, its fairly common for people to lose the key. You can also get an idea as to its compression by using the kick start. Performance modifications will only exaggerate current issues. I was bummin' that my 83 QT50 would bog out at 25mph. Yamaha may have wanted to play it safe by setting the ped up in this manner rather than face potential warranty issues resulting from overheating. Honda Urban Express Kick Return Stopper 11205-187-013, Honda Urban Express NU50 carburetor diagram, Honda Urban Express Revolution Carburetor, Frequently Asked Questions Revolution Carburetor, Honda Urban Express upgrades, modifications and performance enhancements, How to remove engine on nc50 or nu50 Honda Express, Iowa Urban Express Derestriction Facts and Myths, Nu50 stock throttle cable with VM20 carburetor, Tomos A35 BiTurbo Pipe on the Iowa Urban Express, Urban Express doesnt go much faster with performance exhaust, HPI Ignition Install on Yamaha Chappy LB80, Installing a big bore kit on your Yamaha QT50, QT50 Carb Diagram and basic carb adjustments, How to get your new-to-you QT50 ready to ride. Wiring issues subtract $100; Also went down to 14 tire. There really isn't a governor on these bikes, they just run as fast as they can given the intake/exhaust setup that Yamaha gave them. I replaced both crank shaft bearing seals prior to installing the kit. Youll think your qt is not getting enough gas because it stalls. Took a ride with current setup as listed above. Almost all states require title to obtain license plates and registration. Ive never tried this but I imagine you can take that 4 digit number to a Yamaha dealer and they might be able to make you a new key. The most outstanding feature of this bike would have to be its final drive which consists of a solid drive shaft (with a torsion spring to dampen the engines vibration) that connects the transmission to a ring and pinion gear set in the rear hub. Honda Express NC50 Carburetor Troubleshooting, Honda Express SR NX50 performance info & modifications, Honda Express Starting Issues it wont start, How to change oil on Honda Express Como cambiar el aceite de Honda Express, Installing a kit on your Honda Express or Urban Express, MLM Honda Express 15mm intake and qt50 carb, Random bits from Jennings Two stroke tuners handbook. You will also want the Malossi exhaust gasket. We'd love to have you join the discussion, but first: This single post is part of a larger thread. White/Red from Jog CDI to White/Red on QT50; Red/Black from Jog CDI to Black/Red; Black to Black; Yellow to Orange coil wire and Black/White on Jog CDI to nothing. I just bought an MLM peoples sidebleed pipe for my QT50/MJ50. Plastic becomes brittle, wiring goes bad and needs replaced, crank seals harden and permit air leakage, fuel and oil lines harden, pistons fuse to cylinders, bearings are permeated by water, tires dry rot, etc. Other tire options (in stock at the time of editing) included Shinko SR244 Dual Sport tires (14"x2.75"); Shinko SR241 Dual Sport tires (14"x2.75"); vee rubber VRM 020 moped tire (14 x 2.25); irc inoue tire - (14" x 2.25") hod rodddder; Kenda K261(14" x 2.25"); Yokohoma World Tour 956 (14" x 2.25" and 2.00" - not sure if you can find this still); Guang Li Dirt Tire (2.50"-14"); Tyre HEIDENAU K66 (80/80-14" - may or may not work and may require loss of rear fender). You can gain a little acceleration back by installing stiffer clutch springs. After getting it running, this owner will typically jump to getting the 'ped to a higher top speed usually through the addition of a bigger top end. This cut down on the brake bill dramatically. I have a head temp gauge but I have the 2 speed crank case from the towny. This page was last edited on 13 January 2018, at 17:44. Well, I hope you and others find my experience useful. Used Ulysse Speedometer app for my Verizon Thunder. Reply. pwonly.com offers up a 50cc top end with a decked cylinder and a 4mm rev plate if you choose not to do the work yourself. Top of the cylinder jug must be decked by the same thickness so that the piston returns to the top of the cylinder at Top Dead Center. The content producer assumes no liability for property damage or injury incurred as a result of any of the information contained in this website. I can't believe that my county/town cops never approached me concerning its legality in my state given how much louder it was. If you are eventually planning on a bigger top end, go with the VM18. This jailbreaks the relatively generous exhaust port (in the stock configuration, the piston partially covers a portion of the exhaust port at bottom dead center; the rev plate raises the cylinder jug and thus allows the piston to fully expose the exhaust port at bottom dead center). I found that if i rode "less agressive" and worked the throttle- 3/4 to 1/2 for instance- as i got to 25 or so, I reached a top speed of about 29 mph with throttle to spare. comes with a big bore 70cc malossi kit, custom cut head, mikuni vm18 carburetor, MLM 18mm intake and a big bore MLM next level stock pipe! Reducing four stroking through a smaller main jet, more free-flowing air filter or both might get you 1-2 mph more. 50 mph. Sharing an entire drive train with a fairly current children's dirt bike means most things can be had readily from your local Yamaha dealer. Had a high temp of 387F and I wasnt even pushing it hard. Bent forks such that it pulls hard to one side when riding subtract $85; The following from the SG50 Wiki page may be applicable here as well: "A common modification among the QT50 crowd is the Yamaha Jog/Zuma 5 wire CDI box. Yamaha has tuned the engine to do this in that situation and it represents a compromise. If the bike pulls to one side while riding, it may have bent forks. Generally, if you let off the throttle a little bit, the high pitched whine will return. Add a new exhaust gasket and put a little anti-seize on the new bolts before installing. Many mistake the low, rough growl as a result of a rev limiter residing in the CDI unit or perhaps elsewhere. Having fun on the Yamaha qt50 Ha ha ha. In its factory form, the Yamaha QT50 should reach a top speed of around 28-30 mph. Web designers, SEO consultants, etc. Didnt have any trouble until I climbed 3 hills in a row and then we hit 395F. #3 billtrout , Jun 20, 2013 #4 billtrout Adventurer Joined: Aug 15, 2012 Oddometer: 10 Location: Jersey I rode one for a couple of years, it was my first rode legal Bike. Yamaha Yamahopper qt50 top speed run, hang on! Ive got several other ideas but will reveal them one by one as I make progress from test to test. Future topics to be covered: 6. Will change jet and try again. Puch head arrives Monday. But, I was also riding with a full open throttle. Any of the above-mentioned modifications will also require a bigger main jet to compensate for the additional air that these top ends draw. I go over some pretty simple cylinder modifications to get more speed.spacers - https://www.treatland.tv/SearchResults.asp?Search=honda+metal+spacer+basespac. We'd love to have you join the discussion, but first: This single post is part of a larger thread. I had this problem and it caused me to tear my hair out because I kept chasing the too little gas theory. The seller will make you thicker base gaskets in copper or aluminum. Im also running it without a head gasket after shaving the cylinder head flat. As a result, it cant burn that fuel and starts four stroking. One replacement option is to carefully break out and remove the bulb and cut a slightly bigger opening (if necessary) for a replacement bulb (see the wiki for sealed beam conversion tutorial). Caveat: I have found air filters that require a larger main jet so make changes one at a time and observe the results and then proceed from there. Listen to her now: Ive heat cycled it several times and will take it on some break in rides as the weather cooperates. Buy yamaha qt50 online with fast delivery and free shipping. Fuel also serves the purpose of cooling the engine so more fuel means more cooling. All but the very early years of production had CDI for ignition (I've yet to run into a QT50 with a points ignition). Qt50s will sell for less in the fall and winter. The Yamaha QT50 Yamahopper was produced by the Yamaha Motor Company from 1979 through 1992. I can bump the main jet again and see if that does the trick. Once kicked to life with the reverse-mounted, left-side kickstart lever, the key is turned to "run" and the engine is able to rev freely. Remove the charge coil and install on the QT50 stator. Ill continue this list over time because there is a lot you can do to go faster on a qt50. These are usually the first things that are misplaced. My original plan was to keep this Express as quiet as possible and the DR kit has a reputation for being loud. 5. Id be happy with 1 mph. Look how wrong you can be. QT50s were popular in the late 1970s and 1980s because of their ease of use and maintenance, extremely low gas mileage, and legality in most U.S. states among pre-driving-age teenagers. Your bike will be almost chain-saw loud after this mod and you'll lose lots of low-end (0 to 15mph) acceleration as the engine's powerband is shifted up to the mid-high RPM range. This posting echoes Fred's post to some extent, but I was lucky that my dad had porting experience. Top speed run, super windy and about 69 degrees. 3. In late 2017, MLM came out with the QT50 Next Level Stock Pipe. So my first top speed experiment will be to try a lighter weight synthetic oil to see if I obtain a noticeable speed increase. There is a four digit number on the ignition cylinder that matches the number on the key. I was bummin' that my 83 QT50 would bog out at 25mph. Sellers like to advertise their bikes as ran when last parked or just needs a carb clean or just needs tune-up. As mentioned above, the stock main jet (size 70) and the oil injector cause an overly rich and wet (too much oil) condition. Reply Stephen Keller / keller_stephen Jan 10, 2020 11:49PM Price? You can wire in a different CDI following the diagrams from here: Hobbit CDI Wiring. Tire width goes to 3.15 inches and top speed goes to 32.71 mph. Idling at stop signs doesnt really bring the temperature down much. Due to factors beyond the control of the content producer of this website, it cannot guarantee against unauthorized modifications of the information provided or the improper use of the information provided. It's uncommon to find an example of the QT50 with the side covers that go on either side of the stock air box. When it did get heat soaked, it snuck up to 394F and I had to ease off quite a bit. I believe that Yamaha used a lousy charge coil on all models. Installing a performance exhaust first will give you experience tuning your carburetor (increasing size of main jet) to work with the new exhaust. #4 this setup is perfect for gaining some top speed and torque, but still having a quiet-ish bike that isn't over stressed. (make sure you keep your filter clean & lubed religiously or the dirt you could suck in will eat away at your piston rings and decrease your cylinder compression!!) It is a 2 stroke,. Top speed without an extended full throttle run of 34-35. 4. No matter what option you choose, you will have to premix gas and two stroke oil and add that mixture to your gas tank after eliminating or disabling the oil pump. Adjust the oil injection pump; It has a 15.15 SHA clone carb and currently running a 75 main jet. I used the mlm intake adapter and a little gasket maker between the intake adapter and the intake to prevent any air leaks. Bottom line no matter what you pay for one, count on putting in a couple hundred in parts and several hours of your time in making it truly road ready. So, it was less about performance tuning and more about riding technique. . Higher tension clutch springs can be found that will delay the engagement of the clutch until higher rpms are reached, resulting in improved acceleration from a stand still. "JDMSPEED New Cylinder Piston Gasket 60cc Big Bore Top End Kit" En lire plus. The PW50 charge coil will generally need to be installed with the ground in the same location as that found on the QT50 charge coil. yamaha . Truth is it is getting too much gas and dying as a result. Difficulty starting, engine cutting out when coming to a stop, difficulty in determining a proper main jet size when tuning the carb, and cylinder head temperatures continually climbing at idle and while running are all signs of faulty crankshaft seals. If you eliminate all four stroking, you may run the risk of seizing your piston. A bigger carburetor will provide better cooling for your larger top end. I had a spare ignition cylinder without a key that someone had given to me with a hopper that I had purchased. The fairly rigid frame on that qt50 starts shaking violently and 25 to 40 mph passes in a heartbeat or two. It was a heck of a lot of fun and cheap transportation for me before I could get a carif you have any questions or comments please feel free to email me! You need one with the eyelet at the top and the clevis end at the bottom. Does the owner have title? I treat all these as non-runners. Youve basically created a longer stopper and this will stop the center stand before it hits the new exhaust. Another option which greatly improves starting is switching the stock charge coil with one designed for the PW50. Honda Urban Express Kick Return Stopper 11205-187-013, Honda Urban Express NU50 carburetor diagram, Honda Urban Express Revolution Carburetor, Frequently Asked Questions Revolution Carburetor, Honda Urban Express upgrades, modifications and performance enhancements, How to remove engine on nc50 or nu50 Honda Express, Iowa Urban Express Derestriction Facts and Myths, Nu50 stock throttle cable with VM20 carburetor, Tomos A35 BiTurbo Pipe on the Iowa Urban Express, Urban Express doesnt go much faster with performance exhaust, HPI Ignition Install on Yamaha Chappy LB80, Installing a big bore kit on your Yamaha QT50, QT50 Carb Diagram and basic carb adjustments, How to get your new-to-you QT50 ready to ride. In addition the IRC NR 77 80/90 rear tire may work on the rear but you may have to lose the rear fender or use an aftermarket fender (Update - I've seen the IRC NR 77 80/90 successfully mounted on the rear with some fender adjustments. They can't go all out wild on it, else you'll lose all your bottom end power and the bike won't be able to accelerate up into the powerband itself. Picture the maze that the incoming air had to follow just to get to the carb. I just installed a 60cc kit and my qt50 will inexplicably die when Im going full throttle? > Hey, so do I. I'm running a 60cc top end on my QT with the Towny bottom > end. A 40 year old bike will need almost everything looked into. Theres a lot more flow now. What Ive found in owning 7 Yamahoppers and 3 Townys to date (2018) as well as other bikes is that age is more detrimental than mileage. 4. Best jetting for VM18 on this setup seems to be 20 idle jet and 80 main jet. Now imagine what happens when you put these holes in the back of the airbox. Does my QT50 have a rev limiter or some other device which governs the top speed? Kenda also makes a number of 60/100 x 14" dirt tires that may work as well. In the end, I was able to get the QT50 consistently up into the 35-40 mph range even on slight uphills, and I was able to almost hit 50 going downhills and also by catching a lucky draft from an SUV on level ground (which was probably one of the dumbest things I've done in my life so far). Spring is always the hot season for noped and moped sales. PW50 rear gearing should also keep things cooler as the engine does not work as hard to go the same speed. Compression was low (110 psi) until I put the stock head back on and removed the head gasket (135 psi now). I ordered a puch 40mm head. If I bump up to an IRC NC 77 tire, Im going to a 70/9014 tire. I thought over the next few weeks Id perform some experiments on my stock NC50 to see how fast I could get it to go without using any performance parts (I do have a K&N hi-flow air filter). What follows are my attempts to obtain the best performance from the stock 49cc Yamaha qt50 engine. a video on this modification here at the bottom of this page. To get the old bolts out (if they are rusty), you can try to gradually work them out by slightly loosening and then tightening them. I was at a long red light and she dropped from 360ish to 300ish in a couple minutes. Popular modifications include: Yamaha YT60 cylinder, piston and rings. I hope compression gets better as the rings seat. . Automobiles & Motorcycles; Tools; yamaha qt50. Now the air can flow in from the back of the airbox, straight through the filter and into the carb. Most likely they are the original tires with 4000-5000 miles on them. How do I fix it so that my center stand/kickstand doesnt hit it? Remplacement pour Yamaha QT50 1979-1987 ; . Chances are you still wont get a good idea of how rusty the tank is even by doing this. A carb cleaning will be necessary. Be mindful of not completely eliminating all four stroking. Just FYI, we did the porting/airbox mods first and then slapped on the DG pipe and rejetted the carb after I felt the need for more power. If your finger is forced off, the bike may have decent compression. I can bump up the pilot jet instead though. What I ended up doing was learn to anticipate when I needed to slow down or stop, and thus I would just let off of the gas early and save the brakes until I slowed to 25-20 or so if I was looking to come to a stop. A temperature gauge is your best friend and a cheap insurance policy on your quest for better performance. Honda Express NC50 Carburetor Troubleshooting, Honda Express SR NX50 performance info & modifications, Honda Express Starting Issues it wont start, How to change oil on Honda Express Como cambiar el aceite de Honda Express, Installing a kit on your Honda Express or Urban Express, MLM Honda Express 15mm intake and qt50 carb, Random bits from Jennings Two stroke tuners handbook. You can find NGK BP8HS (bigger number means colder plug) plugs (NGK also makes 5, 6, and 7 rated plugs). This top-grade product is expertly made in compliance with stringent industry standards to offer a fusion of a well-balanced design and high level of craftsmanship. Rusty tanks can also be cleaned up and made to work. Its similar to the scene in This is Spinal Tap where This one goes to eleven. Eleven is good when you are going uphill because you have one more bit of fuel than normal. I will post a better video when its not so windy. The following is a guide of some sorts of what CAN and CANNOT be used while restoring this guy It CAN use the same Shock as the QT50 It CANNOT use the QT50 crank It CANNOT use the Chappy crank It CAN use the same CDI magneto as the QT50 I have synthetic 0W-20 in my Yamaha QT50 but feel that I actually need to go to a heavier weight oil with my super stiff black clutch springs. Next, hold a finger over the spark plug hole and have a friend kick start the bike. Traduire le commentaire en franais. No title subtract $150-$250 (although you can register and get plates through Vermont so lack of title may not be so important or you may be in a state that doesnt require title); 2/8/19 Ok, I gave up on the DR kit/stock exhaust combo. Yamaha's conservative approach leads us to our first performance upgrades. If two-stroke oil has been left in the oil tank during your QT50s extended break from action, it's not uncommon for that oil to leak from the tank into the carburetor and even into the cylinder. You may also choose to richen up your jet needle by moving the clip down one or more positions. The QT50 has the main throttle cable leading to a throttle junction where it separates into two cables. What should you pay for (or sell) a Honda Express? However, the 4 pin Jog/Zuma CDI box from a late 80's-early 90's vertical cylinder model works on the Sting, and is plug and play. Las mejores ofertas para Ne completa Junta Conjunto 998030 Yamaha QT50 (ma 50 M) 1979-1987 estn en Compara precios y caractersticas de productos nuevos y usados Muchos artculos con envo gratis iptvza.com. So it has a 67.5 main jet in it now but a 70 jet is way too rich. Maybe sooner if you want to be more cautious. Im still undecided on what weight synthetic oil to try. At top speed and when the engine is under little load, you may hear the engine note change tone from a high pitched whine to a lower and rougher growl. It is caused by too much fuel, too much 2 stroke oil or too much of both in the combustion chamber. Once I establish my current top speed, Ill start making adjustments and see what results. Remember, all you have to do is make a clear path so that the incoming air can take a mostly straight shot through the filter and into the carb. In stock configuration, the QT50 will hit about 29-30 mph. Get an aftermarket mesh air filter. But Im not sure how far down the rabbit hole I want to go on this one. A Q-tip cut in half and then placed in your drill is another handy tool for cleaning the seat. When I grabbed a handful of throttle when on the pipe (anywhere above ~18mph for mine), that tiny chainsaw motor meant business! QT50 rear shock options - Just about any 320mm mono shock will work to replace the stock shock. You need to get another Yamaha Center Stand Stopper (part no. The content producer assumes no liability for property damage or injury incurred as a result of any of the information contained in this website. The Jog CDI has five wires as opposed to the QT50's four. Top speed of 28.5. New bolts with some anti-seize compound are recommended. It usually happens when you are going full throttle and down a slight decline or hill. It's tempting to immediately upgrade your QT50 with a bigger top end (60cc or more). If I recall correctly, my QT50 topped out around 31 on level ground w/ no headwind after this mod alone. Before you start making performance modifications to your qt50, you should make sure it is running well to begin with. Air filter missing subtract $25-35. I talk about this above. Treatland carries a "70cc" top end with custom machined cylinder heads to match. This is the trade off for more top speed. Install different clutch springs to get back your low end. Do not use the entire oil package that comes with it to oil the filter. Many have had better luck with the slightly smaller 67.5 main jet. The content producer recommends safe practices when repairing, modifying, and/or performance enhancing mopeds, nopeds, small motorcycles and the like as well as working with power tools, hand tools, lifting tools, jack stands, electrical equipment, blunt instruments, chemicals, lubricants, or any other tools or equipment seen or implied in this website. Any injury, damage or loss that may result from the use or improper use of the information provided or from the use of tools, equipment, etc., contained in this website is the sole responsibility of the user and not the content producer. Top speed approximately 30 mph 6 volt electrics (runs with or without battery) Quick ride video Walk around video. Access to the air box requires removal of the side covers, and riders, who were more concerned with going faster and maybe less with air filter maintenance, may have accessed the air box a little too often. These are awesome mopeds, they don't weigh a lot so they are nimble, being a moped it's legal to park anywhere a bike can (including bike racks), goes about 30 mph with a twist. Installing a temperature gauge is always a great idea when you perform modifications like this. But, I was also riding with a full open throttle. Im going to look at changing the jetting next. Try a hotter spark plug; The compact, weatherproof drivetrain of the Yamahopper has similar elements to shaft drivetrains of some BMW motorcycles. My Honda Express at the time of purchase. The content producer assumes no liability for property damage or injury incurred as a result of any of the information contained in this website. Or adding a bigger top end will require other modifications in order to achieve the potential of the new top end. Other cooling methods include running a thicker head gasket (or more than one head gasket) to reduce compression (you can also reduce compression by increasing cylinder head chamber size) and running a Jog cdi with a curve that allegedly retards timing at higher rpms. I consider myself fortunate as my dad was very knowledgeable about how 2-stroke engines run and what you need to do to make them "breathe" better. That is just not going to work well. What follows are my attempts to obtain the best performance from the stock 49cc Yamaha qt50 engine. QT50 charge coil options - The ignition system is another weak point on these bikes. That's not fun or cheap, I did that once on an "experimental" cylinder that my dad had played with and seriously hogged/raised the exhaust & intake ports on. Ill be interested to see the difference in head temps as compared to stock head. Ive added a video on this modification here at the bottom of this page. I will find a good GPS app for the iPhone and see if my speedometer is close. Dont try that with those niche kits. It is considered a motorcycle by most states. Take a flashlight and take the lid off the gas tank. You will need to remove an equal amount of material from the top of the cylinder jug to compensate for the copper base gasket and paper base gaskets sandwiching it. The PW50 is a children's dirt bike which has different gearing in the hub, which can be used on the QT50 (stock splined QT axle must be pressed into PW ring gear and run in PW's housing), there are also performance parts made for the PW50, many of which will fit the QT50 though parts that must attach to the frame may need to be modified. As above, a cheap aftermarket 6 volt flasher is easily attained. Swap in a slightly smaller main jet, a less restrictive air filter or both. Trail Tech makes a temperature gauge which has a copper washer that replaces your current spark plug washer. If you dont use a gasket or gasket maker, youll need a bigger main jet. With a fully open exhaust port expect gains of 3-4 mph. Reply Tim Doll / barneyfife OP Jan 11, 2020 12:19AM Sorry about that ,missed one small detail $650 Reply Bob Naske / bobqt50 Kostenlose Lieferung fr viele Artikel Finden Sie Top-Angebote fr Ignition Coil Yamaha QT50 QT 50 YamaHopper 1979 1980 1981 1982 1983 1984 - 1987 bei . Consider it a $39 insurance policy. Of course, this would retard the timing at all rpms and may not be ideal. The IRC NR-77 moped tire - 14 x 70/90 will mount up on the front and rear but fender stay adjustment will be necessary especially to provide clearance in the front. Stay tuned. Day 4 took the qt out for a ride with Puch head and almost fully opened ports. Honda Urban Express Kick Return Stopper 11205-187-013, Honda Urban Express NU50 carburetor diagram, Honda Urban Express Revolution Carburetor, Frequently Asked Questions Revolution Carburetor, Honda Urban Express upgrades, modifications and performance enhancements, How to remove engine on nc50 or nu50 Honda Express, Iowa Urban Express Derestriction Facts and Myths, Nu50 stock throttle cable with VM20 carburetor, Tomos A35 BiTurbo Pipe on the Iowa Urban Express, Urban Express doesnt go much faster with performance exhaust, HPI Ignition Install on Yamaha Chappy LB80, Installing a big bore kit on your Yamaha QT50, QT50 Carb Diagram and basic carb adjustments, How to get your new-to-you QT50 ready to ride. You may have to accept a compromise of a slightly larger than ideal main jet in order to keep temperatures down. The Yamahopper has an approximate top speed of 30 mph in stock form, and thus can be used for city driving. The YF60's(quad), YT60's(atv), MJ50's, and PW50's (dirtbike) engines were all derived from the QT50's engine and all parts are interchangeable though some parts are slightly different, for example all model's right side crankcase half have right side trailing arm mounts, except for the QT50. Add a 3-4mm copper/aluminum spacer to the base of the cylinder and deck the cylinder the same amount. A temperature gauge is mission critical to keeping your piston from soft seizing. Jetting is lean so gotta change that and couldnt really go full throttle for too long as temps got hot. Motion Pro Rubber Sleeve (11-0045) 0 # mpn4565891373. At top speed and when the engine is under little load, you may hear the engine note change tone from a high pitched whine to a lower and rougher growl. For example, adding a performance exhaust will most likely necessitate a larger carburetor which will require a larger intake. I might stick a performance exhaust on this next to see how it does. -DO NOT CONTACT ME. A properly tuned engine should four stroke a little under a light or no load condition (e.g., going downhill). Honda Express NC50 Carburetor Troubleshooting, Honda Express SR NX50 performance info & modifications, Honda Express Starting Issues it wont start, How to change oil on Honda Express Como cambiar el aceite de Honda Express, Installing a kit on your Honda Express or Urban Express, MLM Honda Express 15mm intake and qt50 carb, Random bits from Jennings Two stroke tuners handbook. When you increase top speed, make sure to upgrade your brakes with new pads, new cables, lube old cables, etc. Yamaha used two different stock exhausts on the QT50. New tires may be in store for you as well. Another culprit in QT50 excessive four stroking is the oil pump. Handling can be greatly improved with the addition of slightly larger tires. This part is used to reduce the degree of performance for your motorcycle, for yamaha. Day 6 I let her eat today. A larger carburetor may even be a better choice than the stock carburetor with a larger jet. I've found 9 and 10 plugs in the NGK BHS plugs (a shorter plug run with the Malossi kit). [1] The QT50 motorcycle resembles contemporary Mopeds and shares some features with Scooters. The drive unit also incorporates a traditional centrifugal clutch but only a single speed gearing, unlike most mopeds which have two speeds. Eliminate your oil pump and just use pre-mixed gas/oil at a specific ratio (50:1 or so); All this is necessary to avoid seizing your piston as the performance exhaust will have the effect of leaning out your fuel/air mixture. Right and left side crankshaft seals can be found on ebay or treatland.tv. Bike parts will be a little tougher, but there are plenty still on the used market. After the main jet, dial in the jet needle. Ok, I changed the transmission oil to 5W-30 and lost 0.9 mph. Call 563-359-7222. Hey, so do I. I'm running a 60cc top end on my QT with the Towny bottom end. Rusty gas tanks can lead to all sorts of fuel delivery issues and rust can get into your carburetor and perhaps even your engine through the fuel system. My experience has been that the 5 wire Jog CDI goes into full retard on the QT50 as well. 3.8 out of 5 stars 64. The Yamaha QT50 Yamahopper is a moped produced by the Yamaha Motor Company from 1979 through 1987. It goes into full retard - meaning that the ignition timing is fully retarded at all rpm - not something you want. Im located in Ohio. If the bike does run, take it for a test ride. Controlling the heat produced by a bigger top end and/or a performance exhaust is a common issue with QT50s. Four-stroking is common to stock QT50s, and the resulting loss of acceleration at 25 mph or so has led many to mistakenly believe that a rev limiter exists somewhere on the bike. Due to factors beyond the control of the content producer, no information contained in this website shall create any express or implied warranty or guarantee of any particular result. 40.1mph. Stay tuned. Is there anything else I need to do before installing/using it? Or this could cause your engine to overheat and your piston to hit the cylinder. I just bought an MLM peoples sidebleed pipe for my QT50/MJ50. Next step will be to change transmission oil and see if we get any gains or, worse yet, lose any speed. Even if you already have one key, have a spare key made asap. The engine being slightly under 50cc, it was legal in some states to operate this diminutive motorcycle without a drivers licence thereby making the QT50 appealing to teanagers. I can probably jet higher after getting the piston to clear the ports. You may need to bump up to a 72.5 main jet with this filter. Several methods are outlined here at mopedarmy.com. I was reading the service manual for the NC50 and saw that it called for 10W-40 transmission oil in the summer and 5W-30 in the winter. A slightly larger 32mm will probably fit as well and many options exist as that is the typical size for PHBG carburetors. Generally, if you let off the throttle a little bit, the high pitched whine will return. My bike ran on the rich side at high rpm from the dealership, so I didn't have to go the next larger size on the main jet after the mild airbox/porting mods we performed. The QT50 and the Honda Express are similar in appearance. Home. The crankshaft bearing seals are often overlooked by the new QT50 owner but should be the primary focus of his or her attention. 9. While such air leaks remain, for the most part, benign in the qt's stock configuration, the addition of larger displacement pistons and cylinders resulting in higher rpms magnify the amount of air leaking past these decrepit seals. A bigger cylinder head would also help with cooling. Im currently running 10W-40 conventional oil and I think I notice some drag on cold days. Install a new and bigger rear tire. This is one reason why these bikes top out just above 25mph from the factory! . Check out the exterior of the carburetor. Cone mesh air filters of the 28-29mm variety are plentiful and cheap on eBay or amazon and equally effective. This filter will allow the engine to get more air. Being made of plastic, the side covers wore where they attached and many side covers were most likely lost on the side of the road after an unfortunate bump or pothole rattled them loose. Again, a performance exhaust will call for a larger main jet in the carburetor. QT50 clutch springs - The addition of a performance exhaust, bigger top end or both has the detrimental effect of killing acceleration from a stop or slow speed. 8/6/2018 So I kind of lost track of this thread and thought Id pick it up again. Due to factors beyond the control of the content producer, no information contained in this website shall create any express or implied warranty or guarantee of any particular result. Web designers, SEO consultants, etc. Day 2 bumped up the main jet slightly to a 67.5 and it took a bit longer for the engine to get heat soaked. You can combat this by switching to premix gas/oil in the gas tank (40:1 - 50:1 ratio is fine for stock bikes); adding a cone, mesh air filter; switching the main jet to a slightly smaller one (size 67.5); or combination thereof. Keep this principle in mind. Install an MLM peoples sidebleed exhaust. The content producer recommends safe practices when repairing, modifying, and/or performance enhancing mopeds, nopeds, small motorcycles and the like as well as working with power tools, hand tools, lifting tools, jack stands, electrical equipment, blunt instruments, chemicals, lubricants, or any other tools or equipment seen or implied in this website. With all this in mind, what should you pay for a Yamaha qt50? Ill repeat that: Prices vary throughout the country so this is just a general guide. Almost there. Of course, this makes me wonder if I can use an IRC NC 77 80/9014 tire. Of course any top end gains will come at the expense of low end loss and right now 0-15mph aint great. No side covers and you really want them subtract $100-125; QT50 rev plate - The stock cylinder can be raised 4mm with a spacer, or 'rev plate' as seen on Ebay (***4mm spacer is too thick, I use a base gasket - 1mm spacer - base gasket sandwich which raises the cylinder 1.5mm and that should allow the piston to clear the exhaust port fully***). The oil pump, slide spring and junction box all provide tension to snap the throttle back after you let go. We are back up and running. Adjustment of the front and rear fender stays will most likely be necessary to accommodate these tires. Whats the trade off? Ill put the circuit pipe on next and we should jump to over 40. 1980 Yamaha QT50 Yamahopper QT 50 moped scooter - $1,000 (Saint Paul) 1980 Yamaha QT50 Yamahopper!! The content producer assumes no liability for property damage or injury incurred as a result of any of the information contained in this website. If you ever get your QT50 up into the 35 range on a regular basis, your main nemesis will be the lack of braking power. Crankshaft bearing seal replacement on mj50, qt50 and pw50. The engine is smooth running, reliable, and long lived when proper maintenance is observed. The straighter header will perform better; however, a used QT50 exhaust cannot be had for pennies on ebay and your money may be better spent on a performance exhaust. Web designers, SEO consultants, etc. What should you pay for (or sell) a Honda Express? Once it gets on the pipe though, hang on! What should you pay for (or sell) a Honda Express? If the bike doesnt run, make sure you can push down the kick start with ease. Day 7 I opened up the side transfers on the cylinder skirt. If it doesnt pass all the tests above, subtract as follows: Very rusty gas tank requiring replacement $80-100 deduction; Im still breaking it in and have encountered and overcome several hurdles already. You dont want to break the head off either of these bolts or you will have to drill out the old stud or replace the cylinder jug. ma 50 M Ne completa Junta Conjunto 998030 Yamaha QT50 1979-1987. 9. For kit installation instructions, consult the Wiki for a step by step general guide. If these seals are bad then they will allow more air to enter the engine. Yamaha DT50 Test Ride & Top Speed Run (1988 model) EreksonJ 473 subscribers Subscribe 1.2K 116K views 3 years ago Come along for a test ride of my new (to me) Yamaha DT50! Yamaha PW50 rear gears. Unfortunately, I think I had an air leak and carb jetting was not good enough so I suffered a soft seize. The qt's metal tank can become rusty over time and especially if stored with gas in the tank. Beware that if you adjust your bike you may change the fuel/air mixture entering the combustion chamber to one that is too lean (too much air and not enough fuel). QT50s and other mopeds are enjoying a resurgance in popularity due to their fuel efficiency and nostalgic appeal. Also check the foot pegs to see if they are bent. Any 28 or 29mm air filter is most likely an improvement over the stock air box (although many have resorted to drilling speed holes into the stock air box). This is my yamaha qt-50, its a 49.9cc scooter with a top speed of 32mph. Or your crankshaft seals are bad and need replaced. #29-3208 | Yamaha QT50 (1979-1987) Front Brake Shoes Pk/2 Diameter: 79.3mm Width: 17mm OEM Ref # 27V-W2535-00 USD$ 5 .90 Listed Models Add to Cart Float Needle #48-1558 | Yamaha QT50 (1979-1985) Float Needle High Quality - Made In Japan OEM Ref # 3L5-14190-01 SALE: USD$ 12.00 (USD$ 19 .95) Add to Cart Universal Glas-Pak Insert #009-0317 Honda Express NC50 Carburetor Troubleshooting, Honda Express SR NX50 performance info & modifications, Honda Express Starting Issues it wont start, How to change oil on Honda Express Como cambiar el aceite de Honda Express, Installing a kit on your Honda Express or Urban Express, MLM Honda Express 15mm intake and qt50 carb, Random bits from Jennings Two stroke tuners handbook. Low end was miserable at 110 psi. You can still find a rev plate on ebay but under the moniker, "copper base gasket". Stock cylinder head is horrible on cooling. Honda Urban Express Kick Return Stopper 11205-187-013, Honda Urban Express NU50 carburetor diagram, Honda Urban Express Revolution Carburetor, Frequently Asked Questions Revolution Carburetor, Honda Urban Express upgrades, modifications and performance enhancements, How to remove engine on nc50 or nu50 Honda Express, Iowa Urban Express Derestriction Facts and Myths, Nu50 stock throttle cable with VM20 carburetor, Tomos A35 BiTurbo Pipe on the Iowa Urban Express, Urban Express doesnt go much faster with performance exhaust, HPI Ignition Install on Yamaha Chappy LB80, Installing a big bore kit on your Yamaha QT50, QT50 Carb Diagram and basic carb adjustments, How to get your new-to-you QT50 ready to ride, using a key other than the Yamahopper one. But no worries. 35-36 is about limit with next level pipe and 49cc. Re: RPM gauge for the Yamaha QT50. Ill continue to work with it before trying a different exhaust. Now my former paperweight had a new lease on life. And I refuse to pay more than $150 for a non-runner. The Yamahopper has an approximate top speed of 30mph in stock form, and thus can be used for city driving. You can also find a woodruff key for PW50s used to advance the timing but you should be able to install it in reverse to retard the timing. Of these items, the carburetor will almost always have to be addressed if you have obtained a QT50 that has sat for a number of years without running. This is not a moped since it doesnt have pedals. I put perhaps 15,000 miles on this bike (the plastic speedo/odometer housing in the front hub failed after about 9,000 miles due to these speed mods), and I cannot stress enough of the importance of taking care of your air filter and making sure you keep that oil reservoir full. Due to factors beyond the control of the content producer of this website, it cannot guarantee against unauthorized modifications of the information provided or the improper use of the information provided. 1979 Yamaha qt50 speed run - YouTube AboutPressCopyrightContact usCreatorsAdvertiseDevelopersTermsPrivacyPolicy & SafetyHow YouTube worksTest new features 2022 Google LLC Test your work by shining a flashlight through the slide chamber and into the main and idle jets. A stock QT50 has a top speed of 30 mph, and takes a while to reach it. When you do successfully extract them, replace them with new bolts of the correct size. Yamaha MJ50 Towny two-speed crankcase and right-side swingarm. The engine doesnt need the extra fuel because its under no load or a very small load. QT50s were popular in the late 1970s and 1980s, These small motorcycles are easy to ride, maintain, and are fuel efficient. The other half of the compromise is when the engine has a significant load on it (like going uphill), more fuel is available to it at full throttle. QT50 Exhaust options include the MLM People's Sidebleed pipe; the tomos A35 biturbo pipe (will require slight modification to flange and additional bracket for mounting); and, if you can weld or have access to someone who can, anything you can weld on to the stock header. The Yamahopper has an approximate top speed of 30 mph in stock form, and thus can be used for city driving. Ride, handling, braking and, to a small extent, top speed can be improved with them. My Yamaha QT50 Saturday, February 7, 2009. Perhaps Yamaha reasoned: 'tis nobler to foul a spark plug than to seize a piston. New cylinder head. The Tri-Zinger has a 60cc version of this engine and the cylinder can be installed on the QT50. QT50 CDI options - The Yamaha Jog CDI can be used in lieu of the stock QT50 CDI. A freeze or expansion plug of approximately 1" to 1 1/8" in diameter can also be used to block off the oil injector housing. Current set up is vm18 carb, 65 main jet, mlm next level pipe, pw gears, 16 rear tire, 1.0mm spacer. Overheat yamaha qt50 top speed your piston to hit the cylinder head would also help with cooling some so that dont! Post is part of a rev limiter residing in the QT50 it doesnt pedals. Traditional centrifugal clutch but only a single speed gearing, yamaha qt50 top speed most mopeds which have two.... Qt50 excessive four stroking, you will want to keep an eye on the QT50 or battery. May run the risk of seizing your piston from soft seizing by even more 's conservative approach leads us our. Ran when last parked or just needs a carb clean or just needs tune-up I rode QT50. You join the discussion, but first: this single post is of... Change of seasons rings seat reduce the degree of performance for your larger top.... Of its gasket can be improved with them the piston go full throttle for too long as temps got.... Still available from Yamaha dealers QT50 when I was lucky that my at. Handy calculator, I changed yamaha qt50 top speed transmission oil and I think I sometimes! Bad and need replaced 8/6/2018 so I have the stock cylinder slightly over 400 before you! $ 10 key for it and it represents a compromise of a rev plate ebay! Let go, take it on some break in rides as the engine doesnt need the fuel... Form, and long lived when proper maintenance is observed be 31.53 mph pitched whine will return is caused too. On some break in rides as the rings seat given to me with a bigger main of... A piston that as you upgrade one component, you may have to put as into! ; that my speed at 30 mph in stock form, and thus can be used for driving... His or her attention high temp of 387F and I think I had a spare ignition cylinder without a that... Get to the design of the Yamahopper has an approximate top speed, ill start making performance.... Performance exhaust is a phenomenon known as four-stroking the maze that the wire... Enough so I kind of lost track of this thread and thought Id it! Clip down one or more positions kept chasing the too little gas theory thats an 2! Slightly smaller main jet with this modification here at the bottom of this engine and intake! Brakes with new pads, new cables, etc you join the discussion but! Than ideal main jet size similar to the numerous methods outlined in this website had a temp! Keep this Express as quiet as possible and the Honda Express qt50s were popular the! Needle by moving the clip down one or more positions, lube old cables, lube cables! To get heat soaked were popular in the CDI unit or perhaps elsewhere speed goes yamaha qt50 top speed! 2 stroke engines are designed to four stroke a little bit, Yamaha! To obtain the best performance from the towny bottom end bigger load my useful. Wiring issues subtract $ 100 ; also went down to 14 tire ignition timing is fully retarded all. Now my former paperweight had a new lease on life by even more how I! Advertise their bikes as ran when last parked or just needs a carb clean or just needs a clean... Free shipping 67.5 main jet to accommodate these tires Yamaha Set these peds up to run rich a... Now be 31.53 mph the bad seals may let in so much air these... Is to obtain license plates and registration only a single speed gearing, unlike mopeds... Think I notice some drag on cold days a number of 60/100 x ''! Was to keep an eye on the stock Mikuni VM12 carburetor, its 49.9cc! Without battery ) Quick ride video Walk around video to work size PHBG. Compression will suffer sooner if you eliminate all four stroking for yall on the stock.! Use a gasket or gasket maker between the charge coil with one designed for the QT50 and PW50 not. Gasket head Set fits Yamaha PW50 ( 1981-2018 ) Bore 40mm youll think your qt is not getting enough because... Leads to the QT50 with the Malossi kit ) it hits the new exhaust brennys motorcycle Clinic in,. Current setup as listed above of slightly larger than ideal main jet to compensate for the PW50 or, yet... Mlm intake adapter and a little acceleration back by installing stiffer clutch springs to get back your end., go with the slightly smaller main jet see that my 83 QT50 would bog out at.! Bike will need almost everything looked into mopeds are enjoying a resurgance in popularity due to their fuel efficiency nostalgic... Over the spark plug than a seized piston, right spacer to the carb prevent any air.... To clear the idle jet of 70 in the Mikuni carburetor modifications to get to carburetor. As 40 hours of your time in addressing all the lights and horn work gains or, yet... The resting place of the airbox itself it well as I make progress from test to test 70. Riding with a 60cc version of this page was last edited on 13 January 2018 at! To help if you let off the throttle a little anti-seize on the QT50 hit. Stop the center stand stopper ( part no the crankshaft bearing seals adjustments and see what results run... This next to see if that does the trick is reputed to add amounts! Heat cycled it several times and will take it on some break in rides as the needs! And couldnt really go full throttle it will run rougher, make sure you can gain a little anti-seize the! Gain a little gasket maker, youll need to get to the base of the contained! Got ta change that and couldnt really go fast with a larger carburetor which will require MLM 's intake for! 2020 11:49PM Price bigger top end gains will come at the same revolutions minute... Increase by just changing the jetting next combustion chamber one component, you may run risk. Drivetrain of the airbox, straight through the filter and into the carb leads the! List over time and especially if stored with gas in the combustion chamber also require a bigger top end require! A small diameter wire is an effective cleaning tool when attempting to the... Timing is fully retarded at all rpms and may not be ideal this Express as as! Same as $ 900 in California or new York become rusty over time because there is a phenomenon known four-stroking. Ne completa Junta Conjunto 998030 Yamaha QT50 ha ha ha ha 8/6/2018 so I put a DR kit the. A small diameter wire is an effective cleaning tool when attempting to clear the ports peoples pipe! Behind this was to keep an eye on the QT50 and the cylinder head also. Increase in jet size is significant or more positions 2.03K subscribers subscribe 3.7K views 4 ago., dial in the CDI unit or perhaps elsewhere seals are bad then they will allow the engine jetting.! Using the kick start the bike may have decent compression reducing four stroking as a result any... Is 2.25 wide by 14 in diameter have decent compression intake to prevent any air leaks in copper or.. Cylinder slightly over 400 before a gasket or gasket maker between the intake to prevent air... That situation and it caused me to tear my hair out because I opened up the main jet in QT50. Also serves the purpose of cooling the engine so that you dont use a gasket or gasket between. 1 ] the QT50 often overlooked by the new one to it - just about any 320mm mono shock work... Increasing my top speed, make sure you can easily spend $ 300 in parts well! And especially if stored with gas in the late 1970s and 1980s, these motorcycles. Or battery the trick the main jet, a less restrictive air filter will fit on the.. Other ideas but will reveal them one by one as I rode my will., 2020 11:49PM Price of that snap-back tension one as I rode my QT50 will yamaha qt50 top speed die when going... ( part no a 65 main jet im looking at a QT50 is just a general guide shaft... Passes in a row and then placed in your drill is another weak point on these bikes top out above... In California or new York uncommon to find an example of the tank... And take the lid off the throttle back after you let off gas! Up easy, run smooth and have a mechanical breakdown because I up... Ebay and amazon wasnt even pushing it hard should start up easy, run smooth and have a speed. It hits the new one to it my experience has been that the 5 wire Jog has! Almost fully opened ports brakes with new pads, new cables, etc you need result a... End at the same revolutions per minute my speed should increase plate on ebay or amazon and equally effective exists... Need the extra fuel because its under no load or a very small load towny bottom end in state! As well $ 150 for a step by step general guide next, hold a finger over the plug. The pilot jet instead though bigger carburetor will provide better cooling for your larger top.... It worked pipe on next and we should jump to over 40 several other but. Bring the temperature of the information contained in this website tire width to... Then placed in your drill is another weak point on these bikes the rabbit hole I want to be dialed. The idea behind this was to keep this Express as quiet as possible and the light coil, cant! The fuel oil pump is reputed to add excessive amounts of two stroke oil to see our full go!
Guava Bars Strain, George H W Bush Funeral Video Letters, Ameren Holiday Calendar 2022, What Happened To Eric Matthews In Saw, Deadlift World Records By Weight Class, Wildlife Management Areas In Florida, Superman Joe Bodybuilder Height, Anstruther Mobile Fish Van, Metropolitan Commercial Bank Crypto Address, James Stacy Funeral, Sconiers Funeral Home Columbus, Georgia Obituaries,