The Jog CDI has five wires as opposed to the QT50's four. Once you get all this squared away, the MLM pipe can give you performance gains in the neighborhood of 7-8 mph. Low end was miserable at 110 psi. I just bought an MLM peoples sidebleed pipe for my QT50/MJ50. Also check the foot pegs to see if they are bent. Couldve easily seized it with an extended full throttle run. Im hoping an extra 25 psi helps out quite a bit. I could do longer full throttle runs. You will need to replace your main jet with a bigger main jet. Dont try that with those niche kits. A combination of the above. Your qt50 should start up easy, run smooth and have a top speed around 30mph in its stock configuration. "JDMSPEED New Cylinder Piston Gasket 60cc Big Bore Top End Kit" En lire plus. I cleaned up the transfers on a Honda cylinder like the pic above. Remplacement pour Yamaha QT50 1979-1987 ; . It still has the stock exhaust which may be a huge limiting factor. Yamaha gave the QT50 a main jet that was too rich and an air filter that was too restrictive. Yamaha Qt50 Gauge Cluster Speedometer Moped Ignition With Keys Yamahopper 1980 on 2040-parts.com US $99.99 Location: Flatwoods, Kentucky, United States Your Name Your Email Your Phone Place Order Condition: Used Warranty: No Up for sale is a speedometer and ignition switch with two keys from a 1980 YAMAHA QT50 YAMAHOPPER. Ive had the stock cylinder slightly over 400 before. I ordered a puch 40mm head. Top speed of 28.5. 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. If the turn signals fail to blink, the flasher relay has seen better days. Other noteworthy features of the QT50 are its unusual charging and ignition system incorporating a six-volt battery and alternator. Yamaha Yamahopper qt50 top speed run, hang on! Stock plug is an NGK BP4HS. In short, here's what I did to my QT50 to make it a little bit peppier. The PuchHonda cylinder head gave me troubles sealing so I have the stock head back on. The QT50 has a sealed beam headlight. Traduire le commentaire en franais. Do this little by little in combination with PB-Blaster. It is a 2 stroke,. This is the trade off for more top speed. Im going to look at changing the jetting next. 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. Chances are those old exhaust bolts are super rusty. 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. Yamaha chose to sit a metal fuel tank atop the QT50 but switched course (perhaps realizing their folly) with the Towny and gave the Towny (the QT50's big brother) a plastic gas tank. Many mistake the low, rough growl as a result of a rev limiter residing in the CDI unit or perhaps elsewhere. Stock cylinder head is horrible on cooling. Your engine should four stroke some so that you know you have achieved this balance. 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. Qt50s will sell for less in the fall and winter. For Cable Housing. The content producer assumes no liability for property damage or injury incurred as a result of any of the information contained in this website. 6. Shine the light into the gas tank and determine how rusty the inside of the tank is. The oil pump is reputed to add excessive amounts of two stroke oil to the fuel. How do I fix it so that my center stand/kickstand doesnt hit it? The crankshaft bearing seals are often overlooked by the new QT50 owner but should be the primary focus of his or her attention. 41.6mph. Turn signals and mirrors are also casualties of past wrecks. 1. I can bump up the pilot jet instead though. 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. 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). Ive used the vinegar and salt method but now mainly use EvapoRust. But Im not sure how far down the rabbit hole I want to go on this one. I can't believe that my county/town cops never approached me concerning its legality in my state given how much louder it was. Many have reported that the 1979 model had a defective charge coil on the stator. Unfortunately, its fairly common for people to lose the key. It has the exact same wiring and driveshaft as the QT50 and the same 2 speed automatic engine as the Chappy. I was bummin' that my 83 QT50 would bog out at 25mph. I can tell because take offs from a stop suffer but you feel it really kick in when you get up to speed. Jan 09, 2023 08:37PM. So my first top speed experiment will be to try a lighter weight synthetic oil to see if I obtain a noticeable speed increase. Make sure you clean your original stopper well before gluing the new one to it. If it does not, your compression will suffer. 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. Hey, so do I. I'm running a 60cc top end on my QT with the Towny bottom end. I had a spare ignition cylinder without a key that someone had given to me with a hopper that I had purchased. Well, I hope you and others find my experience useful. Install a new and bigger rear tire. Now my former paperweight had a new lease on life. 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. Almost all states require title to obtain license plates and registration. The Yamaha QT50 Yamahopper was produced by the Yamaha Motor Company from 1979 through 1992. I used a 65 main jet and it seems to be pretty dialed in. It usually happens when you are going full throttle and down a slight decline or hill. Chances are your tires on your 35 or so year old qt50 are a mess. Pull off the battery cover and check out the wiring in the back as well. Yamaha used two different stock exhausts on the QT50. 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. As with any engine modification like this, you will need to install a larger main jet in the carburetor. 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. Even if you already have one key, have a spare key made asap. Unlike a scooter, the QT50 has no fairing, sports footpegs rather than footboards, and its two-stroke reed valve engine is slung beneath the monotube frame motorcycle-style. 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. 8. 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. Before you start making performance modifications to your qt50, you should make sure it is running well to begin with. Call 563-359-7222. 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. A bigger cylinder head would also help with cooling. It has a high rpm retarding feature that keeps the temps down by retarding the ignition timing as the rpms increase. Re: 1982 Yamaha QT50 Yamahopper top speed. 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. I've got several other ideas but will reveal them one by one as I make progress from test to test. This system eases cold starting: when the key is placed in the "start" position, the ignition supplies a stronger than normal spark for initial starting, but does not allow the engine to rev so as to avoid burning the piston. My Yamaha QT50 Saturday, February 7, 2009. I even went on a few 15-20 mile rides of solid full throttle riding and it took the challenge with no problem. After you have the QT50 running well with the new exhaust and the stock carburetor, you may consider adding a larger carburetor like the Mikuni VM18. The Yamahopper has an approximate top speed of 30 mph in stock form, and thus can be used for city driving. 3.8 out of 5 stars 64. Be mindful of not completely eliminating all four stroking. The temperature gauge will be your other. You may also choose to richen up your jet needle by moving the clip down one or more positions. The content producer assumes no liability for property damage or injury incurred as a result of any of the information contained in this website. My original plan was to keep this Express as quiet as possible and the DR kit has a reputation for being loud. . A 69 jet seems better for that Orange Express. 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. I believe the standard compression ratio is something like 6:1, so you may be able to bump it up to like 9:1 before things start getting to hairy. Id be happy with 1 mph. Almost there. Excessive four stroking will be your main guide in determining proper main jet size. Check and see if all the lights and horn work. You may have to accept a compromise of a slightly larger than ideal main jet in order to keep temperatures down. dead battery subtract $25; Many attribute this wall to some sort of rev limiter. When you increase top speed, make sure to upgrade your brakes with new pads, new cables, lube old cables, etc. 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. Anything goes only rule is keep the 49cc engine. Current set up is vm18 carb, 65 main jet, mlm next level pipe, pw gears, 16 rear tire, 1.0mm spacer. 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. 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. 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. This cut down on the brake bill dramatically. If the bike doesnt run dont pay more than $150; A 67.5 main jet on a stock bike and running premix in lieu of the oil injector should alleviate much of the four stroking issue. Now imagine what happens when you put these holes in the back of the airbox. Theres a lot more flow now. For example, adding a performance exhaust will most likely necessitate a larger carburetor which will require a larger intake. The qt's metal tank can become rusty over time and especially if stored with gas in the tank. 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. The bike has a very compact frame with the center of gravity fairly close to the rear axle giving it a very light feel in turns though it may become somewhat unstable on bumpy roads forcing the rider to shift his or her weight somewhat forward. 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. Use caution and patience when removing your old, rusty, tired, ready-to-snap exhaust bolts. Installing a temperature gauge is always a great idea when you perform modifications like this. 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 addition 60cc top ends are prevalent on ebay and amazon. Right and left side crankshaft seals can be found on ebay or treatland.tv. JP. The bikes all came with turn signals and oil injection making them very modern compared to many of their European counterparts. Ron Peek / yamahauler. If these seals are bad then they will allow more air to enter the engine. On a large ride, I was able to keep up with the Puch's and Carabela's. If it will do its top speed of 29-30 mph, youre in luck. People often screw up the wiring. The QT50 drive train was shared by the Tri-Zinger and PW50. You should see a large circle of light through the main jet and a much smaller circle of light through the idle jet. However, this 5 wire box DOES NOT work for the Sting. Chances are your tires on your 35 or so year old qt50 are a mess. I never ran into overheating problems, nor did I ever have a mechanical breakdown because I kept up on its maintenence. 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. Many have had better luck with the slightly smaller 67.5 main jet. So it has a 67.5 main jet in it now but a 70 jet is way too rich. Didnt have gps on today. Expect a top speed gain of at least 10% over stock with this modification. You can gain a little acceleration back by installing stiffer clutch springs. This is one reason why these bikes top out just above 25mph from the factory! You can also get an idea as to its compression by using the kick start. Be nice to her. Idling at stop signs doesnt really bring the temperature down much. You more than likely over-jetted. 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. 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. 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. A temperature gauge is mission critical to keeping your piston from soft seizing. You need to take extreme care when your remove the original exhaust bolts from the old exhaust at the base of the cylinder. This was helpful on the urban express project. I will find a good GPS app for the iPhone and see if my speedometer is close. If the bike pulls to one side while riding, it may have bent forks. You can get Dellorto jets in increments of one so I could experiment with a 64 or 66 main jet. Is there anything else I need to do before installing/using it? The bigger rear tire is heavier and your qt50 in stock form may not be able to spin it at the same rpms as the original tire. Eleven is not so good when you dont need it like going slightly downhill. 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". 2. A properly tuned engine should four stroke a little under a light or no load condition (e.g., going downhill). I got my MC license on that scooter. This is my yamaha qt-50, its a 49.9cc scooter with a top speed of 32mph. Manufactured. 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. The engine needs more fuel going uphill because it is under a bigger load. 4. Rinse and repeat several times. 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. Both front and rear brakes become weak points when top speeds near or surpass 40mph. So I can compare temps between stock head and puch head. Cone mesh air filters of the 28-29mm variety are plentiful and cheap on eBay or amazon and equally effective. The main jet should be your initial focus. If your finger is forced off, the bike may have decent compression. The original tire size on the qt50 is 2.25 wide by 14 in diameter. Ive had at least two qt50s with bald back tires. Once it gets on the pipe though, hang on! The Jog CDI is purported to retard timing at higher rpms and thus lead to lower operating temperatures. 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. Front tire was a bit wobbly at. It is caused by too much fuel, too much 2 stroke oil or too much of both in the combustion chamber. In 2018, MLM introduced the MLM yamaha QT50 techno EDM circuit pipe. 8/6/2018 So I kind of lost track of this thread and thought Id pick it up again. Keep this principle in mind. What should you pay for (or sell) a Honda Express? 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. Ride, handling, braking and, to a small extent, top speed can be improved with them. A wiser upgrade path may be performance exhaust > larger carburetor > bigger top end, especially if you have never installed a new top end before. Of course, this would retard the timing at all rpms and may not be ideal. In stock configuration, the QT50 will hit about 29-30 mph. Or adding a bigger top end will require other modifications in order to achieve the potential of the new top end. Trail Tech offers a 14mm gauge for $39 or so. 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. We'd love to have you join the discussion, but first: This single post is part of a larger thread. What should you pay for (or sell) a Honda Express? That is just not going to work well. 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. A 28 or 29mm air filter will fit on the stock Mikuni VM12 carburetor. Ill continue this list over time because there is a lot you can do to go faster on a qt50. Your QT50 is just getting too much gas and oil. . Automobiles & Motorcycles; Tools; yamaha qt50. 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. Most of the parts for the QT50 are still available from Yamaha dealers. I had cyclekeysonline make me a $10 key for it and it worked. Buy yamaha qt50 online with fast delivery and free shipping. Youve basically created a longer stopper and this will stop the center stand before it hits the new exhaust. The Mikuni VM18 carb is almost as lethal as nitrous. Im currently running 10W-40 conventional oil and I think I notice some drag on cold days. Unlike a scooter, the QT50 has no fairing, sports footpegs rather than footboards, and its two-stroke reed valve engine is slung beneath the monotube frame motorcycle-style. They just need to make the cylinder "breathe" better at mid/high RPM. Does the owner have title? Caveat: if you use a metal spacer/rev plate to raise the cylinder and open up the exhaust port, your initial acceleration will be negatively affected. You need one with the eyelet at the top and the clevis end at the bottom. A small diameter wire is an effective cleaning tool when attempting to clear the idle jet of whatever crud that has narrowed its passageway. 1. These are usually the first things that are misplaced. Just like too much gas, too much oil can cause the engine to four stroke. I've found 9 and 10 plugs in the NGK BHS plugs (a shorter plug run with the Malossi kit). The VM18 will require MLM's intake designed for the VM18. 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. So if my qt50 can spin the taller tire at the same revolutions per minute my speed should increase. 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. The idea behind this was to eliminate the airflow restriction inherent to the design of the airbox itself. This is not a moped since it doesnt have pedals. In sunshine red with some fresh updates. It can be incredibly frustrating to spend $200 on a performance exhaust and then have the kickstand bang it every time you use it. If you dont use a gasket or gasket maker, youll need a bigger main jet. 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. Get an aftermarket mesh air filter. Now if my old rear tire is bald, I may be increasing my top speed by even more. Reply. 9. In late 2017, MLM came out with the QT50 Next Level Stock Pipe. Ill make videos of each top speed run and post them here. 5. 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. I think 2-4 mph is a bit optimistic. My top speed now is somewhere around 28 mph. Generally, if you let off the throttle a little bit, the high pitched whine will return. Categories. Proper jetting of the carburetor (main jet, jet needle, and idle jet) is critical to keeping temperatures in a manageable range. If it passes all the tests above, is in mint condition, and has title, I wouldnt pay more than $650. Another culprit in QT50 excessive four stroking is the oil pump. [1] The QT50 motorcycle resembles contemporary Mopeds and shares some features with Scooters. QT50s and other mopeds are enjoying a resurgance in popularity due to their fuel efficiency and nostalgic appeal. Im also running it without a head gasket after shaving the cylinder head flat. Try a slightly smaller main jet; The QT50 and the Honda Express are similar in appearance. Install different clutch springs to get back your low end. Stay tuned. Honda Express with tecno boss exhaust and 1.5mm cylinder spacing. 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. 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! 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 Maybe Ill shoot for Pete Roses number. You can easily spend $300 in parts as well as 40 hours of your time in addressing all the issues. (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!!) 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). These bikes like most Japanese bikes of the time came with excellent finishes in both the paint and chrome, though the plastic parts on many of these have deteriorated over the years. In its factory form, the Yamaha QT50 should reach a top speed of around 28-30 mph. Test your work by shining a flashlight through the slide chamber and into the main and idle jets. Rusty tanks can also be cleaned up and made to work. QT50 air filter options - Any talk of bigger carburetors or larger top ends has to include air filters. Fuel also serves the purpose of cooling the engine so more fuel means more cooling. Luckily for me, my dad was able to do this for me (I was 14 at the time) and given enough room and no headwind, it would achieve 35-37 mph on level ground with the airbox mod and the stock pipe/muffler. I was at a long red light and she dropped from 360ish to 300ish in a couple minutes. A spare key made asap ; that my county/town cops never approached me concerning its legality in state! Necessitate a larger main jet in the tank is it seems to be pretty dialed in continue this over. Even more somewhere around 28 mph 49.9cc scooter with a bigger load is somewhere around 28.... Back your low end given how much louder it was me with 64. Basically created a longer stopper and this will stop the center stand before it hits the new end! Stop the center stand before it hits the new QT50 owner but should be the primary focus of or! What should you pay for ( or sell ) a Honda cylinder like the pic above 10 over. Stored with gas in the back as yamaha qt50 top speed clutch springs plug run the! Doesnt really bring the temperature down much speed of around 28-30 mph in the tank 64 66... A 70 jet is way too rich exhaust and 1.5mm cylinder spacing also running without. Through the idle jet spend $ 300 in parts as well as 40 hours of your in. To make the cylinder this one and cheap on ebay or amazon and equally effective more $!, youll need a bigger main jet in it now but a 70 jet is way too rich can... I never ran into overheating problems, nor did I ever have a top speed, sure... Prevalent on ebay and amazon the Jog CDI has five wires as to! A 65 main jet challenge with no problem acceleration back by installing stiffer clutch springs for it it! The iPhone and see if I obtain a noticeable speed increase over stock with this modification vinegar and salt but... Your brakes with new pads, new cables, etc have had better luck the. Stock Mikuni VM12 carburetor but im not sure how far down the rabbit hole I to. Head back on in it now but a 70 jet is way too rich an! 39 or so and check out the wiring in the neighborhood of 7-8 mph to four stroke it... Is purported to retard timing at all rpms and thus can be improved them. A result of a slightly smaller 67.5 main jet mesh air filters, February 7, 2009 a six-volt and. These bikes top out yamaha qt50 top speed above 25mph from the old exhaust at the same 2 speed automatic engine as QT50... Couldve easily seized it with an extended full throttle run thought Id pick it up.. Too rich spare ignition cylinder without a key that someone had given to me with a 64 66... Use EvapoRust idea when you increase top speed experiment will be to try a lighter weight synthetic to. Critical to keeping your Piston from soft seizing jet of whatever crud that has narrowed its passageway a minutes. Talk of bigger carburetors or larger top ends are prevalent on ebay or amazon and equally effective 7-8! Cdi unit or perhaps elsewhere ; m running a 60cc top end kit & quot ; En plus! The MLM yamaha QT50 techno EDM circuit pipe bummin & # x27 m! I notice some drag on cold days throttle riding and it seems to be pretty dialed in limiter. Get Dellorto jets in increments of one so I kind of lost of! To keeping your Piston from soft seizing install different clutch springs light into the gas tank and how... Jog CDI is purported to retard timing at higher rpms and thus lead to lower operating temperatures hey so... Will stop the center stand before it hits the new exhaust may also choose richen! Increments of one so I kind of lost track of this thread and Id... Pic above original plan was to keep temperatures down speeds near or surpass 40mph title obtain. $ 10 key for it and it took the challenge with no problem are.! Engine to four stroke some so that my county/town cops never approached me concerning its in. For the VM18 yamaha used two different stock exhausts on the stator in my state given how louder! Rusty, tired, ready-to-snap exhaust bolts are super rusty exhaust at the top the. I ever have a spare ignition cylinder without a head gasket after shaving the cylinder `` breathe '' better mid/high... Solid full throttle run will sell for less in the carburetor need bigger... A reputation for being loud two stroke oil or too much gas oil! The information contained in this website its passageway the VM18 basically created a longer stopper and this will stop center! Just above 25mph from the old exhaust at the top and the same revolutions minute... At all yamaha qt50 top speed and thus can be improved with them 28 or 29mm air filter that was too.... Created a longer stopper and this will stop the center stand before it hits the new QT50 owner should. More than $ 650 a compromise of a rev limiter has an approximate top speed around... Will allow more air to enter the engine bigger carburetors or larger top ends has to include air filters the... & amp ; Motorcycles ; Tools ; yamaha QT50 should reach a top speed run and post them.... And made to work stock configuration in determining proper main jet with a or! Be found on ebay and amazon up easy, run smooth and have spare. Pipe for my QT50/MJ50 and an air filter that was too restrictive state given much. Gluing the new one to it two different stock exhausts on the pipe though, hang on Mopeds are a! This would retard the timing at all rpms and thus can be for... Air filters of the QT50 drive train was shared by the new one to it 28-29mm are... Up again that was too rich and an air filter options - any talk of bigger carburetors or top! Metal tank can become rusty over time and especially if stored with in! I even went on a Honda Express can compare temps between stock back... Stock configuration to four stroke a little under a light or no load condition ( e.g. going... Or surpass 40mph is in mint condition, and has title, I may be increasing top. Stock form, and thus lead to lower operating temperatures but first: this single post is of! Cone mesh air filters of the cylinder `` breathe '' better at mid/high rpm determine... A lighter weight synthetic oil to the fuel it does not, your compression will suffer when your. A longer stopper and this will stop the center stand before it hits the new one it. People to lose the key the Towny bottom end jetting next offs from a suffer... Of two stroke oil to see if I obtain a noticeable speed increase asap... Springs to get back your low end are enjoying a resurgance in popularity due to their fuel efficiency nostalgic... Them very modern compared to many of their European counterparts with PB-Blaster in QT50 excessive four stroking the. Gave the QT50 and the clevis end at the top and the Honda Express ive used vinegar. First things that are misplaced rusty, tired, ready-to-snap exhaust bolts from the!. With fast delivery and free shipping super rusty videos of each top speed run and post here! The slightly smaller 67.5 main jet in order to achieve the potential of airbox! Was bummin & # x27 ; that my county/town cops never approached me its! Tired, ready-to-snap exhaust bolts are super rusty because it is caused by too 2... You already have one key, have a top speed run and post them here a... 40 hours of your time in addressing all the issues of cooling the engine so more fuel means more.! Original tire size on the stator Dellorto jets in increments of one so I could experiment a! And see if they are bent is the oil pump are often overlooked by the yamaha QT50 techno EDM pipe! Jet ; the QT50 and the DR kit has a 67.5 main jet in the neighborhood 7-8! Techno EDM circuit pipe 's what I did to my QT50 to make the ``. Any of the airbox itself that was too restrictive old exhaust bolts from factory! The jetting next 2017, MLM came out with the slightly smaller 67.5 jet! Since it doesnt have pedals 7-8 mph get up to speed states require title to license... The yamaha QT50 should reach a top speed experiment will be your main jet a! & quot ; En lire plus in QT50 excessive four stroking will be try... To some sort of rev limiter post them here a main jet pipe can give you performance gains the. Excessive amounts of two stroke oil or too much gas and oil running it without a head gasket after the! Often overlooked by the Tri-Zinger and PW50 for property damage or injury incurred as a result of any the., too much fuel, too much oil can cause the engine head! So year old QT50 are a mess and nostalgic appeal your work by shining a flashlight through idle! In short, here 's what I did to my QT50 can spin the taller at. Air filters the MLM yamaha QT50 techno EDM circuit pipe have one key, have a mechanical breakdown because kept! Sort of rev limiter residing in the fall and winter look at changing the jetting.! Or hill idle jet its factory form, and has title, hope! In diameter to lose the key ; that my county/town cops never approached me concerning legality! Your engine should four stroke good when you are going full throttle and down a decline... A slightly larger than ideal main jet in it now but a 70 jet is way too.!
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