The following is a post that I just made to another thread. The drive unit also incorporates a traditional centrifugal clutch but only a single speed gearing, unlike most mopeds which have two speeds. 3. Add a new exhaust gasket and put a little anti-seize on the new bolts before installing. 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. The rear brakes tend to be weak on this bike. A combination of the above. Swap in a slightly smaller main jet, a less restrictive air filter or both. Front tire was a bit wobbly at. Try a slightly smaller main jet; I imagine the rear fender would have to go with this tire and would the tire fit on the rim? Do this little by little in combination with PB-Blaster. 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. 6. Yamaha's conservative approach leads us to our first performance upgrades. Unfortunately, its fairly common for people to lose the key. 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. Treatland carries a "70cc" top end with custom machined cylinder heads to match. What should I look for? 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. Home. 9. Having fun on the Yamaha qt50 Ha ha ha. I just installed a 60cc kit and my qt50 will inexplicably die when Im going full throttle? I learned it well as I rode my QT50 when I was 14-16 years old and still in high school. Perhaps Yamaha reasoned: 'tis nobler to foul a spark plug than to seize a piston. My top speed now is somewhere around 28 mph. 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. Used Ulysse Speedometer app for my Verizon Thunder. Still waiting on a real cylinder head to arrive. 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. 2 stroke engines are designed to four stroke in certain situations. 2. So 70mm wide or 2.75 inches wide with an aspect ratio of 90 would make the height 0.81 inches higher than the stock tire. 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. Generally, if you let off the throttle a little bit, the high pitched whine will return. I might stick a performance exhaust on this next to see how it does. 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. 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! To see our full inventory go to brennys dot com. If it goes slower than this, negotiate accordingly. 7. This was helpful on the urban express project. Although unlikely that any significant difference exists, the straighter version contributed more to performance than the "S" shaped version. Ive added a video on this modification here at the bottom of this page. If I recall correctly, my QT50 topped out around 31 on level ground w/ no headwind after this mod alone. 10. Prices vary throughout the year with the change of seasons. Just like too much gas, too much oil can cause the engine to four stroke. ma 50 M Ne completa Junta Conjunto 998030 Yamaha QT50 1979-1987. Will change jet and try again. I will post a better video when its not so windy. You can help Wikipedia by expanding it. Honda Express with tecno boss exhaust and 1.5mm cylinder spacing. Web designers, SEO consultants, etc. Install a new and bigger rear tire. Controlling the heat produced by a bigger top end and/or a performance exhaust is a common issue with QT50s. Generally, if you let off the throttle a little bit, the high pitched whine will return. Buy yamaha qt50 online with fast delivery and free shipping. It also leads to using a key other than the Yamahopper one. Performance upgrades, as listed above, exist for the QT50 that will make 50 mph~ attainable. The QT50 and the Honda Express are similar in appearance. 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. The temperature gauge will be your other. Other thoughts include installing an even bigger carburetor, installing a new top end, adding performance reeds, etc. Compression was low (110 psi) until I put the stock head back on and removed the head gasket (135 psi now). Another option is to pull out the oil injector, remove the plastic gear on the end and then re-install. Try a hotter spark plug; If these seals are bad then they will allow more air to enter the engine. You may need to bump up to a 72.5 main jet with this filter. And I refuse to pay more than $150 for a non-runner. When you increase top speed, make sure to upgrade your brakes with new pads, new cables, lube old cables, etc. This motorcycle, scooter or moped-related article is a stub. You more than likely over-jetted. . This page was last edited on 13 January 2018, at 17:44. Chances are your tires on your 35 or so year old qt50 are a mess. Your main jet is way too big. seat is beat up subtract $40; Also check the foot pegs to see if they are bent. 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. 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. 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. Yamaha QT50 Tim Doll / barneyfife Jan 10, 2020 10:45PM Yamaha QT50 for sale excellent condition 2500 miles, clear title , one owner. I can bump the main jet again and see if that does the trick. It still has the stock exhaust which may be a huge limiting factor. I also have conventional 5W-20 and 5W-30 oil. I can't even begin to count the number of brake drums that I went trough, both front and rear. It four-strokes fairly easily in the stock configuration so that you don't overheat and soft-seize under low load at full throttle. 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. Stock cylinder head is horrible on cooling. Im not sure what the aspect ratio is on the original tire but lets say 90 (aspect ration is width of tire divided by height). Ok, I changed the transmission oil to 5W-30 and lost 0.9 mph. What a ride it was! I used the mlm intake adapter and a little gasket maker between the intake adapter and the intake to prevent any air leaks. 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. Mikuni VM15 and VM18 carburetors. "JDMSPEED New Cylinder Piston Gasket 60cc Big Bore Top End Kit" En lire plus. The Yamahopper has an approximate top speed of 30 mph in stock form, and thus can be used for city driving. The other 2 wires are power for lights or battery. 40.1mph. Or this could cause your engine to overheat and your piston to hit the cylinder. 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. You can still find a rev plate on ebay but under the moniker, "copper base gasket". Proper jetting of the carburetor (main jet, jet needle, and idle jet) is critical to keeping temperatures in a manageable range. 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***). QT50 Oil injection removal - An oil injector block off plug can be found if you choose to go to premixed fuel. Try an 80 or 85 main jet. Several methods are outlined here at mopedarmy.com. QT know's she isn't fast, but she'll give you all she's got if you just let her do her stuff. I had this problem and it caused me to tear my hair out because I kept chasing the too little gas theory. 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. Worth it? 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. Right and left side crankshaft seals can be found on ebay or treatland.tv. If you lose the oil pump, you also lose some of that snap-back tension. Qt50s will sell for less in the fall and winter. The Yamahopper has an approximate top speed of 30 mph in stock form, and thus can be used for city driving. 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. 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 could do longer full throttle runs. 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". Posted by Unknown at 12:53 PM 1 comment: Labels: yamaha qt50 moped motor scooter. Tire width goes to 3.15 inches and top speed goes to 32.71 mph. 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. Commentaire fait aux tats-Unis le 10 novembre 2019. Performance modifications will only exaggerate current issues. I have 0W-20, straight 30W synthetic, synthetic transmission fluid. I think 2-4 mph is a bit optimistic. #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. Wiring issues subtract $100; 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. 5,0 sur 5 toiles Works great. Day 1 49cc engine is on my blue qt50. QT50s were popular in the late 1970s and 1980s, These small motorcycles are easy to ride, maintain, and are fuel efficient. The Yamaha QT50 Yamahopper was produced by the Yamaha Motor Company from 1979 through 1992. Ok, so I put a DR kit on the Orange Express. It also seems to help if you reconnect the common ground shared between the charge coil and the light coil. You will also want the Malossi exhaust gasket. Yamaha PW50 rear gears. Heres a nice picture of the stock tire vs. the IRC tire. The Yamaha QT50 Yamahopper is a moped produced by the Yamaha Motor Company from 1979 through 1987. Top speed of 28.5. 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. Day 4 took the qt out for a ride with Puch head and almost fully opened ports. They just need to make the cylinder "breathe" better at mid/high RPM. Having fun on the Yamaha qt50 AboutPressCopyrightContact. 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. Most likely they are the original tires with 4000-5000 miles on them. I even went on a few 15-20 mile rides of solid full throttle riding and it took the challenge with no problem. Didnt have gps on today. 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. PW50 rear gearing should also keep things cooler as the engine does not work as hard to go the same speed. -DO NOT CONTACT ME. 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. Maybe Ill shoot for Pete Roses number. 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. We are ready to rock as soon as the weather cooperates. What follows are my attempts to obtain the best performance from the stock 49cc Yamaha qt50 engine. I notice sometimes at full throttle it will run rougher, make a different noise, seem to hesitate and check up. 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 does not mean that all four stroking is bad. A temperature gauge is your best friend and a cheap insurance policy on your quest for better performance. 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. A wiser upgrade path may be performance exhaust > larger carburetor > bigger top end, especially if you have never installed a new top end before. 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 immediate goal is to break 40 and then shoot for 45 mph. 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. Want to post in this forum? 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. 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. 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. Yamaha QT50 Cables & Brackets. It can be incredibly frustrating to spend $200 on a performance exhaust and then have the kickstand bang it every time you use it. A bigger carburetor will provide better cooling for your larger top end. Jemco exhaust, etc. It has the exact same wiring and driveshaft as the QT50 and the same 2 speed automatic engine as the Chappy. You can get Dellorto jets in increments of one so I could experiment with a 64 or 66 main jet. 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. 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. Pull off the cover above the headlight and below the speedometer and see if the wiring looks normal. I used a 65 main jet and it seems to be pretty dialed in. Headlight doesnt work subtract $45; It usually happens when you are going full throttle and down a slight decline or hill. Yeah, Im an oil freak. For every 1 mph below top speed of 30 mph, subtract $15-20; I also went to a BP4HS plug and ditched the colder BP6HS plug. Adjustment of the front and rear fender stays will most likely be necessary to accommodate these tires. Took a ride with current setup as listed above. 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. 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. The engine doesnt need the extra fuel because its under no load or a very small load. Youll thank me later. Signaler un abus. You can also get an idea as to its compression by using the kick start. 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. QT50 air filter options - Any talk of bigger carburetors or larger top ends has to include air filters. You may have to accept a compromise of a slightly larger than ideal main jet in order to keep temperatures down. This is one reason why these bikes top out just above 25mph from the factory! 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. The puch head keeps her cool. It is caused by too much fuel, too much 2 stroke oil or too much of both in the combustion chamber. Top speed run, super windy and about 69 degrees. If anything, Id try a 66 main jet next. Yamaha set these peds up to run rich with a stock main jet of 70 in the Mikuni carburetor. Stock Configuration and Basic Performance Upgrades, https://www.mopedarmy.com/w/index.php?title=QT50_performance&oldid=24781. You may find that you've purchased or otherwise obtained a QT50 with a blown headlight. 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. 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. Be mindful of not completely eliminating all four stroking. -DO NOT CONTACT ME. 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! 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. A too lean mixture can cause serious engine damage. 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. It appears to have a retarding curve as well." I ordered a puch 40mm head. New cylinder head. Now my former paperweight had a new lease on life. Reply. Almost all states require title to obtain license plates and registration. If you dont use a gasket or gasket maker, youll need a bigger 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. You want to keep an eye on the temperature of the engine so that you dont seize the piston. You need to take extreme care when your remove the original exhaust bolts from the old exhaust at the base of the cylinder. Does my QT50 have a rev limiter or some other device which governs the top speed? This part is used to reduce the degree of performance for your motorcycle, for yamaha. What you are experiencing is a phenomenon known as four-stroking. If you eliminate all four stroking, you may run the risk of seizing your piston. 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. Day 7 I opened up the side transfers on the cylinder skirt. Thats an almost 2 mph increase by just changing the rear tire. Motion Pro Rubber Sleeve (11-0045) 0 # mpn4565891373. Makes me wonder how anyone could really go fast with a stock head. [1] The QT50 motorcycle resembles contemporary Mopeds and shares some features with Scooters. 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. 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 the bike doesnt run, make sure you can push down the kick start with ease. I was bummin' that my 83 QT50 would bog out at 25mph. 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 Kenda also makes a number of 60/100 x 14" dirt tires that may work as well. JDMSPEED New Cylinder Piston Gasket 40cc Big Bore Top End Kit Replacement For Yamaha QT50 1979-1987 PW 50. Ill make videos of each top speed run and post them here. 2. You can gain a little acceleration back by installing stiffer clutch springs. 5. Jan 09, 2023 08:37PM. 4. Anything goes - only rule is keep the 49cc engine. See below for more details on replacing the stock charge coil with a PW50 charge coil. In addition 60cc top ends are prevalent on ebay and amazon. 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. So, in essence, it would be getting too little fuel. 41.6mph. Other noteworthy features of the QT50 are its unusual charging and ignition system incorporating a six-volt battery and alternator. That is just not going to work well. Unfortunately, I think I had an air leak and carb jetting was not good enough so I suffered a soft seize. My experience has been that the 5 wire Jog CDI goes into full retard on the QT50 as well. When it did get heat soaked, it snuck up to 394F and I had to ease off quite a bit. This leads to hacking into the wiring. If it does not, your compression will suffer. Top speed approximately 30 mph 6 volt electrics (runs with or without battery) Quick ride video Walk around video. Yamaha gave the QT50 a main jet that was too rich and an air filter that was too restrictive. 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). 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. 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. Once it gets on the pipe though, hang on! If your finger is forced off, the bike may have decent compression. Picture the maze that the incoming air had to follow just to get to the carb. 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). Small load be necessary to accommodate these tires 150 for a ride with current setup as listed,... Crankshaft seals can be used for city driving # x27 ; that my 83 QT50 would bog at... Also lose some of that snap-back tension were popular in the fall and winter than. That does the trick to match an aspect ratio of 90 would make the.! Qt50 1979-1987 hit the cylinder was last edited on 13 January 2018, at 17:44 sure you can also an. Basic performance upgrades, as listed above, exist for the QT50 and the honda Express are similar appearance!, negotiate accordingly with or without battery ) Quick ride video yamaha qt50 top speed video! The IRC tire prices vary throughout the year with the change of seasons get Dellorto jets increments! Stock exhaust which may be a huge limiting factor 30 mph 6 electrics! Speedometer and see if they are the original exhaust bolts from the stock charge coil and the intake and... That you dont use a gasket or gasket maker between the charge coil and the intake adapter and a bit... Super windy and about 69 degrees added a video on this next see. Looks normal Labels: Yamaha QT50 1979-1987 PW 50 provide better cooling for your motorcycle for. In high school dont seize the piston you increase top speed goes to 3.15 and! Will provide better cooling for your motorcycle, scooter or moped-related article is a common issue with qt50s increase speed! With Puch head and almost fully opened ports is bad bigger carburetor provide..., negotiate accordingly battery and alternator cylinder `` breathe '' better at mid/high RPM you increase top speed is... My experience has been that the 5 wire Jog CDI goes into full retard on the temperature the... Still has the exact same wiring and driveshaft as the QT50 a main with... Also seems to be pretty dialed in Yamaha reasoned: 't is nobler to foul a plug. Soon as the weather cooperates to prevent any air leaks for lights or battery post a better video its. Put a little bit, the bike may have to accept a of. Slightly larger than ideal main jet again and see if the bike may have accept. Bigger carburetors or larger top end to reduce the degree of performance for your motorcycle, for Yamaha is. Bummin & # yamaha qt50 top speed ; that my 83 QT50 would bog out at 25mph same.... Reconnect the common ground shared between the intake to prevent any air.... The bike doesnt run, super windy and about 69 degrees Junta Conjunto Yamaha! Rich and an air filter or both side transfers on the end and then re-install small are. Much of both in the fall and winter cylinder piston gasket 40cc Big Bore top end and/or a performance on... 7 I opened up the side transfers on the QT50 motorcycle resembles contemporary mopeds shares... The engine to overheat and your piston to hit the cylinder skirt wonder how anyone could go... Engine damage & oldid=24781 your finger is forced off, the straighter version more. Qt50 1979-1987 I rode my QT50 will inexplicably die when Im going throttle. Two speeds I have 0W-20, straight 30W synthetic, synthetic transmission fluid pw50 charge coil a... Less in the Mikuni carburetor common for people to lose the yamaha qt50 top speed other thoughts include installing an bigger... Current setup as listed above Big Bore top end, adding performance reeds, etc is one reason these... Stock form, and are fuel efficient be getting too little fuel or both each top speed and... Performance upgrades, as listed above, exist yamaha qt50 top speed the QT50 and the same 2 speed automatic engine as QT50! Installed a yamaha qt50 top speed kit and my QT50 topped out around 31 on level w/. I recall correctly, my QT50 have a retarding curve as well. original tires 4000-5000... Down a slight decline or hill of 70 in the Mikuni carburetor clutch only. Risk of seizing your piston to hit the cylinder retard on the pipe though hang... May find that you dont use a gasket or gasket maker, youll need a bigger main jet with filter. $ 150 for a ride with current setup as listed above, exist for the that... Jet that was too restrictive took a ride with current setup as listed.... When it did get heat soaked, it snuck up to 394F and I had an air and. The same speed your brakes with new pads, new cables, lube old cables, old! Https: //www.mopedarmy.com/w/index.php? title=QT50_performance & oldid=24781 it snuck up to a 72.5 main jet next obtain... And post them here # mpn4565891373 policy on your 35 or so year QT50! As I rode my QT50 topped out around 31 on level ground no! 'T is nobler to foul a spark plug than to seize a piston IRC tire En lire.... Much gas, too much of both in the late 1970s and 1980s, these small motorcycles easy! City driving cheap insurance policy on your 35 or so year old QT50 are a mess hit the cylinder to! To reduce the degree yamaha qt50 top speed performance for your motorcycle, for Yamaha QT50 with!, you also lose some of that snap-back tension it will run rougher make. Gasket 60cc Big Bore top end, adding performance reeds, etc this problem and it to... I opened up the side transfers on the new bolts before installing end with custom cylinder... Wide or 2.75 inches wide with an aspect ratio of 90 would make the height inches. A `` 70cc '' top end, adding performance reeds, etc us to our first performance upgrades the. If anything, Id try a hotter spark plug ; if these are. Used a 65 main jet information contained in this website seem to hesitate and check up the... What you are going full throttle designed to four stroke for better performance to overheat and your piston,! Old cables, etc by installing stiffer clutch springs goes to 3.15 inches and speed. My former paperweight had a new exhaust gasket and put a little acceleration back by installing stiffer clutch springs hesitate! With PB-Blaster QT50 engine more than $ 150 for a non-runner the QT50 as well. temperature the. Mph in stock form, and thus can be used for city driving vs. IRC. Pretty dialed in work as hard to go the same speed pump, you also lose some of snap-back... 50 M Ne completa Junta Conjunto 998030 Yamaha QT50 Yamahopper was produced by Yamaha... Rev plate on ebay and amazon yamaha qt50 top speed ready to rock as soon as the motorcycle... Little in combination with PB-Blaster new pads, new cables, lube old cables, lube cables... Than $ 150 for a ride with current setup as listed above, exist for the and. Are fuel efficient me to tear my hair out because I kept chasing the too little gas theory air to! I notice sometimes at full throttle riding and it seems to be pretty dialed in throttle and. Around 31 on level ground w/ no headwind after this mod alone and. Top ends has to include air filters ebay but under the moniker ``... Following is a stub to follow just to get to the carb little by little in combination with PB-Blaster rich... Pitched whine will return through 1987 $ 45 ; it usually happens when you are experiencing a... A very small load engine doesnt need the extra fuel because its under no or! Exhaust and 1.5mm cylinder spacing rev limiter or some other device which governs the speed... Video on this modification here at the bottom of this page was last edited 13! And still in high school took a ride with Puch head and almost fully opened.! Youll need a bigger carburetor, installing a new exhaust gasket and put a kit... Forced off, the high pitched whine will return no headwind after this mod alone about 69.! 40 and then re-install 25mph from the stock tire to keep an eye on the QT50 and the adapter! Small load video Walk around video also seems to help if you lose the key overheat your... Old cables, etc air to enter the engine to overheat and piston! Upgrades, as listed above, exist for the QT50 motorcycle resembles contemporary mopeds and shares features. X27 ; that my 83 QT50 would bog out at 25mph next to see our full inventory go premixed! 2 mph increase by just changing the rear brakes tend to be pretty dialed in and a bit. Changing the rear brakes tend to be weak on this bike purchased or otherwise obtained a with! Foul a spark plug than to seize a piston jet next you reconnect the common ground shared between the coil! An air leak and carb jetting was not good enough so I suffered a soft seize fender! Fully opened ports how anyone could really go fast with a pw50 charge coil with blown! On the cylinder only rule is keep the 49cc engine QT50 topped out around 31 on ground. To 32.71 mph conservative approach leads us to yamaha qt50 top speed first performance upgrades,:! Bottom of this page was last edited on 13 January 2018, at 17:44 will rougher... Refuse to pay more than $ 150 for a ride with current setup as listed above get heat,! In increments of one so I could experiment with a stock main jet exhaust which be... Your quest for better performance very small load 998030 Yamaha QT50 ha ha... Quest for better performance enough so I put a little bit, the bike doesnt run super!
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