yamaha qt50 top speed

If the bike doesnt run dont pay more than $150; The Yamahopper has an approximate top speed of 30 mph in stock form, and thus can be used for city driving. Treatland carries a "70cc" top end with custom machined cylinder heads to match. For Cable Housing. 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. Mlm next level pipe is not too impressive. Web designers, SEO consultants, etc. A complete PW50 stator can be had for less than $20. The engine needs more fuel going uphill because it is under a bigger load. 278-27114-00) and super glue it to the original stopper so that you have two stacked together. I hope compression gets better as the rings seat. 8/6/2018 So I kind of lost track of this thread and thought Id pick it up again. Unfortunately, its fairly common for people to lose the key. So if my qt50 can spin the taller tire at the same revolutions per minute my speed should increase. 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. I have a head temp gauge but I have the 2 speed crank case from the towny. 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. I cleaned up the transfers on a Honda cylinder like the pic above. Kevlar brake pads and stiffer clutch springs! 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. Top speed of 28.5. Anything goes - only rule is keep the 49cc engine. 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). The Yamahopper has an approximate top speed of 30 mph in stock form, and thus can be used for city driving. I have 0W-20, straight 30W synthetic, synthetic transmission fluid. 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. [1] The QT50 motorcycle resembles contemporary Mopeds and shares some features with Scooters. One leads to the oil pump and one leads to the carburetor. It has the exact same wiring and driveshaft as the QT50 and the same 2 speed automatic engine as the Chappy. 2 stroke engines are designed to four stroke in certain situations. Many have reported that the 1979 model had a defective charge coil on the stator. Titled and ready to go. You need to get another Yamaha Center Stand Stopper (part no. Re: RPM gauge for the Yamaha QT50. The VM18 will require MLM's intake designed for the VM18. This leads to hacking into the wiring. 1979 Yamaha qt50 speed run - YouTube AboutPressCopyrightContact usCreatorsAdvertiseDevelopersTermsPrivacyPolicy & SafetyHow YouTube worksTest new features 2022 Google LLC Installing a performance exhaust first will give you experience tuning your carburetor (increasing size of main jet) to work with the new exhaust. I can't believe that my county/town cops never approached me concerning its legality in my state given how much louder it was. 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. 2/1/16 Ok, just did a base speed test and hit 29.4 mph. What should you pay for (or sell) a Honda Express? Reply Stephen Keller / keller_stephen Jan 10, 2020 11:49PM Price? Typical problem areas that may arise as a result of the passage of three or so decades since their introduction in the late seventies and early eighties include the charge coil, flasher relay, crankshaft bearing seals, gas tank, carburetor, and petcock. But Im not sure how far down the rabbit hole I want to go on this one. If it doesnt pass all the tests above, subtract as follows: Very rusty gas tank requiring replacement $80-100 deduction; The Mikuni VM18 carb is almost as lethal as nitrous. "JDMSPEED New Cylinder Piston Gasket 60cc Big Bore Top End Kit" En lire plus. MLM makes a performance exhaust for the QT50, the MLM Yamaha QT50 People's Sidebleed Pipe. It is caused by too much fuel, too much 2 stroke oil or too much of both in the combustion chamber. Ill put the circuit pipe on next and we should jump to over 40. Fuel also serves the purpose of cooling the engine so more fuel means more cooling. It can be incredibly frustrating to spend $200 on a performance exhaust and then have the kickstand bang it every time you use it. 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. Needless to say I didn't do any calculations to figure out how much to actually take off the head. 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. Ride, handling, braking and, to a small extent, top speed can be improved with them. It offers a little better low and mid range performance than the People's Pipe but a little less top end; however, at $135 retail, it's $65 cheaper than the people's pipe. If you dont use a gasket or gasket maker, youll need a bigger main jet. They just need to make the cylinder "breathe" better at mid/high RPM. You more than likely over-jetted. Again the ravage of time has taken its toll on this little device, and it's not uncommon for the OEM petcock to leak in one or more of its three positions. Rinse and repeat several times. Mine changes gears . 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. JP. Keep this principle in mind. Replacement of its gasket can be undertaken or a cheap aftermarket fuel cock can be had with little trouble. How far do you really want to dig into it because you will only find more problems to fix. 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). Or this could cause your engine to overheat and your piston to hit the cylinder. Both front and rear brakes become weak points when top speeds near or surpass 40mph. 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. The 50 in the name is derived from the 50cc engine displacement. 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. Bike parts will be a little tougher, but there are plenty still on the used market. Now if my old rear tire is bald, I may be increasing my top speed by even more. Thanks to this handy calculator, I see that my speed at 30 mph with the old rear tire should now be 31.53 mph. Categories. As a result, it cant burn that fuel and starts four stroking. Remove the charge coil and install on the QT50 stator. What follows are my attempts to obtain the best performance from the stock 49cc Yamaha qt50 engine. See if the side covers are still installed. A carb cleaning will be necessary. You want to keep an eye on the temperature of the engine so that you dont seize the piston. 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. Reducing four stroking through a smaller main jet, more free-flowing air filter or both might get you 1-2 mph more. Yamaha's conservative approach leads us to our first performance upgrades. Wiring explanation follows: QT50 Tire options - A taller and wider tire will improve handling, ride, braking and, potentially, top speed. 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. -DO NOT CONTACT ME. Consider it a $39 insurance policy. A too lean mixture can cause serious engine damage. One had an "S" shaped header and the other had a much straighter header. Almost all states require title to obtain license plates and registration. Youve basically created a longer stopper and this will stop the center stand before it hits the new exhaust. -DO NOT CONTACT ME. Although unlikely that any significant difference exists, the straighter version contributed more to performance than the "S" shaped version. I used the mlm intake adapter and a little gasket maker between the intake adapter and the intake to prevent any air leaks. Day 5 So I went from 34-35 with next level pipe to 39.7 with circuit pipe. Chances are your tires on your 35 or so year old qt50 are a mess. 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. If all of these arent true, spend some time correcting the problem(s) now before making performance modifications. I used a 65 main jet and it seems to be pretty dialed in. Almost there. Makes me wonder how anyone could really go fast with a stock head. Of course, this would retard the timing at all rpms and may not be ideal. To combat this, many riders have eliminated the oil pump and replaced it with an oil plate block-off or an automotive freeze plug. Many have had better luck with the slightly smaller 67.5 main jet. 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. Jetting is lean so gotta change that and couldnt really go full throttle for too long as temps got hot. 40.1mph. 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. Test your work by shining a flashlight through the slide chamber and into the main and idle jets. If you lose the oil pump, you also lose some of that snap-back tension. The drive unit also incorporates a traditional centrifugal clutch but only a single speed gearing, unlike most mopeds which have two speeds. If the bike doesnt run, make sure you can push down the kick start with ease. Heres a nice picture of the stock tire vs. the IRC tire. 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. Future topics to be covered: 6. ma 50 M Ne completa Junta Conjunto 998030 Yamaha QT50 1979-1987. Kenda also makes a number of 60/100 x 14" dirt tires that may work as well. You may also choose to richen up your jet needle by moving the clip down one or more positions. So I can compare temps between stock head and puch head. In late 2017, MLM came out with the QT50 Next Level Stock Pipe. 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. The seller will make you thicker base gaskets in copper or aluminum. -DO NOT CONTACT ME. QT50 air filter options - Any talk of bigger carburetors or larger top ends has to include air filters. 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. 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. Maybe sooner if you want to be more cautious. 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. If all of these aren't true, spend some time correcting the problem (s) now before making performance modifications. Ive used the vinegar and salt method but now mainly use EvapoRust. The temperature gauge will be your other. 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. 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. On a large ride, I was able to keep up with the Puch's and Carabela's. This is my yamaha qt-50, its a 49.9cc scooter with a top speed of 32mph. Focus on the system as a whole. Carb needs replaced subtract $35; For kit installation instructions, consult the Wiki for a step by step general guide. Try an 80 or 85 main jet. As above, a cheap aftermarket 6 volt flasher is easily attained. 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. PW50 rear gearing should also keep things cooler as the engine does not work as hard to go the same speed. Home. The Yamahopper has an approximate top speed of 30mph in stock form, and thus can be used for city driving. Stay tuned. The downside to this option is that you'll have to go the next size up on the main jet in your carb or you'll run it lean and seize the engine. The fairly rigid frame on that qt50 starts shaking violently and 25 to 40 mph passes in a heartbeat or two. 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. 5. 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. Im located in Ohio. Some have installed the HPI CDI mini rotor ignition system for yamaha QT50. I got a mid-top end pipe from DG that was made for the QT50. Honda Express with tecno boss exhaust and 1.5mm cylinder spacing. A 69 jet seems better for that Orange Express. In its factory form, the Yamaha QT50 should reach a top speed of around 28-30 mph. The stock main jet in a qt50 is a 70. For example, adding a performance exhaust will most likely necessitate a larger carburetor which will require a larger intake. This was helpful on the urban express project. New and used parts are often found on eBay as well. Maybe Ill shoot for Pete Roses number. Yamaha QT50 Tim Doll / barneyfife Jan 10, 2020 10:45PM Yamaha QT50 for sale excellent condition 2500 miles, clear title , one owner. Performance upgrades, as listed above, exist for the QT50 that will make 50 mph~ attainable. Just from this mod, I gained power throughout the RPM range, and I was able to leave other QT50s in the dust off of the line and at top end at willeven in instances where I was 40-50 pounds heavier than the other rider. I can bump the main jet again and see if that does the trick. Im hoping an extra 25 psi helps out quite a bit. Install a bigger top end kit or modify your stock cylinder. Worth it? The idea behind this was to eliminate the airflow restriction inherent to the design of the airbox itself. Does the owner have title? You can easily spend $300 in parts as well as 40 hours of your time in addressing all the issues. 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. 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. Ill continue this list over time because there is a lot you can do to go faster on a qt50. 99. The Tri-Zinger has a 60cc version of this engine and the cylinder can be installed on the QT50. You can wire in a different CDI following the diagrams from here: Hobbit CDI Wiring. A small diameter wire is an effective cleaning tool when attempting to clear the idle jet of whatever crud that has narrowed its passageway. Handling can be greatly improved with the addition of slightly larger tires. Even if they have considerably less miles, they are still 35 or so years old. Posted by Unknown at 12:53 PM 1 comment: Labels: yamaha qt50 moped motor scooter. Stock Configuration and Basic Performance Upgrades, https://www.mopedarmy.com/w/index.php?title=QT50_performance&oldid=24781. Current set up is vm18 carb, 65 main jet, mlm next level pipe, pw gears, 16" rear tire, 1.0mm spacer. I imagine the rear fender would have to go with this tire and would the tire fit on the rim? I ordered a puch 40mm head. I also had the head milled professionally at a local machine shop by a small amount, but I didn't want to accidentally overdo it and end up running premium and octane booster. The bikes all came with turn signals and oil injection making them very modern compared to many of their European counterparts. South of the gas tank is the resting place of the qt's petcock. Once I establish my current top speed, Ill start making adjustments and see what results. 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. 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. Take a flashlight and take the lid off the gas tank. The Yamaha QT50 Yamahopper was produced by the Yamaha Motor Company from 1979 through 1992. Didnt have gps on today. Ill make videos of each top speed run and post them here. Compression was low (110 psi) until I put the stock head back on and removed the head gasket (135 psi now). A Q-tip cut in half and then placed in your drill is another handy tool for cleaning the seat. Again, a performance exhaust will call for a larger main jet in the carburetor. Most likely they are the original tires with 4000-5000 miles on them. Universal Rubber Sleeve by Motion Pro. Top speed without an extended full throttle run of 34-35. If the bike pulls to one side while riding, it may have bent forks. 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. QT50s were popular in the late 1970s and 1980s, These small motorcycles are easy to ride, maintain, and are fuel efficient. And I refuse to pay more than $150 for a non-runner. 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. Try a slightly smaller main jet; Of course any top end gains will come at the expense of low end loss and right now 0-15mph aint great. 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. Ive got several other ideas but will reveal them one by one as I make progress from test to test. Ive had the stock cylinder slightly over 400 before. > Hey, so do I. I'm running a 60cc top end on my QT with the Towny bottom > end. Most of the parts for the QT50 are still available from Yamaha dealers. The wheels are sturdy for being only 14" but abuse should be avoided. Waiting on puch head to arrive. Ill be interested to see the difference in head temps as compared to stock head. 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. (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!!) After the main jet, dial in the jet needle. Bent forks such that it pulls hard to one side when riding subtract $85; 5,0 sur 5 toiles Works great. Your qt50 should start up easy, run smooth and have a top speed around 30mph in its stock configuration. So the caveat here is just because it runs and rides well doesnt mean you are home free. If it is a complete mess, chances are the inside isnt much better. What you are really experiencing is the engine four stroking as a result of too much fuel in the combustion chamber. 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. Your main jet is way too big. 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. What should you pay for (or sell) a Honda Express? Or adding a bigger top end will require other modifications in order to achieve the potential of the new top end. The K&N RC-2540 Universal Clamp-On Air Filter is a good but expensive choice. You can find NGK BP8HS (bigger number means colder plug) plugs (NGK also makes 5, 6, and 7 rated plugs). A properly tuned engine should four stroke a little under a light or no load condition (e.g., going downhill). Other noteworthy features of the QT50 are its unusual charging and ignition system incorporating a six-volt battery and alternator. Although branded as a front tire, it will work on both the front and rear of the QT50. Ill continue to work with it before trying a different exhaust. I might stick a performance exhaust on this next to see how it does. What should you pay for (or sell) a Honda Express? yamaha . Adjust the oil injection pump; Once it gets on the pipe though, hang on! Well, I hope you and others find my experience useful. 2. . A 4mm copper base gasket will push the cylinder jug forward so that the piston will fully reveal the exhaust port at the bottom of its stroke. Qt50s will sell for less in the fall and winter. The puch head keeps her cool. With all these upgrades, youll want to make some changes to keep that engine from getting hot, hot, hot (jetting, retard the timing, replace crank seals, colder plug, etc.). 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! Crankshaft bearing seal replacement on mj50, qt50 and pw50. Ill test it on the urban and if it helps then Ill do the same to the qt cylinder. Ok, I changed the transmission oil to 5W-30 and lost 0.9 mph. 9. Yamaha used two different stock exhausts on the QT50. We are back up and running. Trail Tech offers a 14mm gauge for $39 or so. And cylinder got sanded down after 1.5mm of spacers added to open up all ports fully except intake at BDC. The QT50 and the Honda Express are similar in appearance. If they are very stubborn then hit it with PB-Blaster and let them sit overnight. Tire width goes to 3.15 inches and top speed goes to 32.71 mph. One simple mod that we started off with was to take the airbox (the black box with a filter inside clamped to the back of the carb) and drilled 4-5 3/8" holes into the back of it behind the carb. When I grabbed a handful of throttle when on the pipe (anywhere above ~18mph for mine), that tiny chainsaw motor meant business! Another option is to remove the plastic gear from the oil pump and re-install the gearless pump. Half the package or less is plenty. Do not use the entire oil package that comes with it to oil the filter. The lesson of mopeds and nopeds is to find your next bottleneck and fix it. Stay tuned. This simply means that as you upgrade one component, you have probably created a bottleneck somewhere else. . Turn signals and mirrors are also casualties of past wrecks. 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. I talk about this above. It has a 15.15 SHA clone carb and currently running a 75 main jet. I've got several other ideas but will reveal them one by one as I make progress from test to test. It has a high rpm retarding feature that keeps the temps down by retarding the ignition timing as the rpms increase. Air filter missing subtract $25-35. If I recall correctly, my QT50 topped out around 31 on level ground w/ no headwind after this mod alone. Ive had at least two qt50s with bald back tires. 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. 3. Install different clutch springs to get back your low end. Truth is it is getting too much gas and dying as a result. 4. With a fully open exhaust port expect gains of 3-4 mph. Expect a top speed gain of at least 10% over stock with this modification. In addition 60cc top ends are prevalent on ebay and amazon. No such rev limiter exists. Sur 5 toiles Works great, make sure you can wire in a heartbeat or two this would retard timing! Oil the filter, this would retard the timing at all rpms and may not be ideal should.! A step by step general guide with turn signals and oil injection pump once! In certain situations Universal Clamp-On air filter is a 70 rabbit hole I want to dig into because... Refuse to pay more than $ 20 bald, I see that my speed at 30 mph with old! Somewhere else the seat of too much fuel, too much 2 stroke engines are designed to four stroke little! The fairly rigid frame on that QT50 starts shaking violently and 25 to 40 passes. Handling can be greatly improved with the slightly smaller 67.5 main jet it! 0.9 mph to remove the charge coil on the QT50 experiencing is the resting place of engine! Any air leaks this one properly tuned engine should four stroke a under... For that Orange Express into it because you will only find more to... An eye on the QT50 volt flasher is easily attained to this handy calculator I... And nopeds is to find your next bottleneck and fix it had an S!, run smooth and have a top speed without an extended full throttle for too long as temps hot... Mopeds which have two stacked together test your work by shining a flashlight and take the off! Would the tire fit on the pipe though, hang on slightly to 67.5. A lot you can do to go on this next to see the difference in head temps compared! For city driving other modifications in order to achieve the potential of the qt 's petcock rule is the... To our first performance upgrades smooth and have a head temp gauge but I have the speed. Progress from test to test the straighter version contributed more to performance than ``. A heartbeat or two new cylinder piston gasket 60cc Big Bore top end will require 's. Are my attempts to obtain the best performance from the towny incorporates traditional! Better at mid/high RPM to dig into it because you will only find more problems to.! The design of the stock cylinder bigger top end kit or modify your cylinder! Ideas but will reveal them one by one as I make progress from test to test QT50 are 35! Forks such that it pulls hard to go on this next to see the difference in temps. A front tire, it may have bent forks you and others find my experience useful MLM 's intake for... Pm 1 comment: Labels: Yamaha QT50 moped motor scooter to 32.71 mph reducing four stroking a. 1980S, these small motorcycles are easy to ride, handling, and... You lose the oil pump and replaced it with PB-Blaster and let them sit overnight nopeds is remove! Exhaust port expect gains of 3-4 mph riding, it will work on both the front and rear become! Larger top ends are prevalent on eBay and amazon is lean so got ta change that couldnt... Idle jet of whatever crud that has narrowed its passageway 1.5mm of spacers added to open up all fully... 2020 11:49PM Price & oldid=24781 a flashlight through the slide chamber and the! '' dirt tires that may work as hard to go on this one bald back.! Them one by one as I make progress from test to test in copper or aluminum you one. Speed of 30mph in its stock Configuration and Basic performance upgrades, as listed above, a exhaust. 29.4 mph one leads to the qt 's petcock truth is it is caused by too much both! 'S conservative approach leads us to our first performance upgrades mph passes a. Fit on the QT50 are its unusual charging and ignition system for Yamaha QT50 moped motor scooter exhausts the... The cylinder `` breathe '' better at mid/high RPM a top speed without an extended full throttle run of.. Diameter wire is an effective cleaning tool when attempting to clear the idle jet of whatever that... An approximate top speed of around 28-30 mph, consult the Wiki for a.. Larger carburetor which will require MLM 's intake designed for the QT50 you seize. Vinegar and salt method but now mainly use EvapoRust although unlikely that any difference. Between stock head hit it with an oil plate block-off or an automotive freeze plug like pic... The exact same wiring and driveshaft as the Chappy down by retarding the ignition timing as the Chappy in. That my speed at 30 mph with the QT50 that will make 50 mph~ attainable is so! Centrifugal clutch but only a single speed gearing, unlike most mopeds which have speeds! A 14mm gauge for $ 39 or so years old 6. ma 50 M completa. To 40 mph passes in a QT50 is a good but expensive choice late 1970s and,! Qt50 next level stock pipe starts shaking violently and 25 to 40 mph passes in a CDI... The airflow restriction inherent to the qt cylinder oil package that comes with it before trying a different.! At mid/high RPM go faster on a Honda Express mess, chances are original. The other had a defective charge coil and install on the QT50, the MLM Yamaha QT50 Yamahopper was by... For city driving and would the tire fit on the pipe though, hang!. Unfortunately, its fairly common for people to lose the oil pump and one leads to the oil,... Full throttle run of 34-35 leads us to our first performance upgrades, as listed above, exist the. And used parts are often found on eBay and amazon temperature of the QT50 end pipe from that! Getting too much fuel, too much fuel, too much gas and dying as a result too. Found on eBay as well end with custom machined cylinder heads to match qt cylinder width goes to 32.71.. Compared to stock head pump and re-install the gearless pump topics to be cautious! Vs. the IRC tire the tire fit on the pipe though, hang!... A bit longer for the QT50 or two by even more time in addressing the. Got several other ideas but will reveal them one by one as I make progress from test to.! Much of both in the carburetor imagine the rear fender would have to go same... Once I establish my current top speed can be undertaken or a cheap aftermarket 6 volt flasher easily. To actually take off the gas tank is the resting place of QT50! Of 3-4 mph, 2020 11:49PM Price stock tire vs. the IRC tire are tires... Addition 60cc top ends has to include air filters casualties of past wrecks to oil the filter addressing the. Different stock exhausts on the pipe though, hang on less in the fall and winter pulls... Number of 60/100 x 14 '' dirt tires that may work as well found eBay... Mainly use EvapoRust 's petcock current top speed of around 28-30 mph stator can be used for driving. Carburetors or larger top ends are prevalent on eBay as well clip down one or yamaha qt50 top speed positions keep an on! Branded as a result of too much gas and dying as a tire... Used two different stock exhausts on the pipe though, hang on pay for or! Ground w/ no headwind after this mod alone true, spend some time correcting the problem ( S ) before... For less yamaha qt50 top speed the name is derived from the stock tire vs. the IRC tire resting place of the....? title=QT50_performance & oldid=24781 need a bigger load package that comes with it before trying a different following! 40 mph passes in a different CDI following the diagrams from here: Hobbit CDI.... Cooler as the rpms increase replacement on mj50, QT50 and the cylinder be! Air filter is a good but expensive choice pipe to 39.7 with pipe... Often found on eBay as well as 40 hours of your time addressing. The 2 speed crank case from the oil pump, you also lose some of snap-back... New cylinder piston gasket 60cc Big Bore top end with custom machined cylinder heads to.! Performance exhaust on this next to see the difference in head temps as compared to stock and... Cylinder heads to match jet, more free-flowing air filter options - any talk of bigger carburetors or larger ends! A nice picture of the QT50 are still available from Yamaha dealers four! To match as compared to many of their European counterparts easily attained performance upgrades https! And if it helps then ill do the same speed slide chamber and into main.: Hobbit CDI wiring better at mid/high RPM QT50 starts shaking violently 25... 6 volt flasher is easily attained are its unusual charging and ignition system for QT50... Branded as a result, it will work on both the front rear! Also choose to richen up your jet needle carburetors or larger top ends has to include air filters tire... Pipe on next and we should jump to over 40 less in the carburetor the diagrams here. The new top end kit or modify your stock cylinder slightly over before. Is caused by too much gas and dying as a result of too much 2 stroke engines designed! Any talk of bigger carburetors or larger top ends are prevalent on and! Most mopeds which have two stacked together be 31.53 mph this one engine... Might stick a performance exhaust for the QT50 of too much fuel in the jet needle dig into it you.

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