yamaha qt50 top speedyamaha qt50 top speed

Stock cylinder head is horrible on cooling. Expect a top speed gain of at least 10% over stock with this modification. The Jog CDI is purported to retard timing at higher rpms and thus lead to lower operating temperatures. Yamaha used two different stock exhausts on the QT50. I believe that Yamaha used a lousy charge coil on all models. 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. Unfortunately, its fairly common for people to lose the key. 5. What should you pay for (or sell) a Honda Express? I just bought an MLM peoples sidebleed pipe for my QT50/MJ50. The content producer assumes no liability for property damage or injury incurred as a result of any of the information contained in this website. QT50 Oil injection removal - An oil injector block off plug can be found if you choose to go to premixed fuel. The crankshaft bearing seals are often overlooked by the new QT50 owner but should be the primary focus of his or her attention. Adjust your throttle stop screw and your idle air screw on your carb; You can also get an idea as to its compression by using the kick start. Replacement is not too difficult but does involve a few specialized tools (flywheel puller, flywheel holder or piston stop, torque wrench, soldering iron). QT50 rear shock options - Just about any 320mm mono shock will work to replace the stock shock. 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. 99. Most of these bikes are around 40 years old. -DO NOT CONTACT ME. Get an aftermarket mesh air filter. Do not use the entire oil package that comes with it to oil the filter. Titled and ready to go. 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 ordered a puch 40mm head. Re: RPM gauge for the Yamaha QT50. Again, a performance exhaust will call for a larger main jet in the carburetor. So the caveat here is just because it runs and rides well doesnt mean you are home free. 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. Better a fouled spark plug than a seized piston, right? Now if my old rear tire is bald, I may be increasing my top speed by even more. 9. What a ride it was! You want to keep an eye on the temperature of the engine so that you dont seize the piston. Its like an old house. Install an MLM peoples sidebleed exhaust. It's simple, maintenance-free shaft-drive contained in the single-sided swingarm eliminates chain maintenance, safety and wear concerns as well as weather wear factors and contributes to the durability and ease of use of these tiny motorbikes. You may find that you've purchased or otherwise obtained a QT50 with a blown headlight. Consider it a $39 insurance policy. Prices vary throughout the year with the change of seasons. A cone, mesh or pod air filter will also help with excessive four stroking. 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. 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. I talk about this above. 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. If you lose the oil pump, you also lose some of that snap-back tension. As with any engine modification like this, you will need to install a larger main jet in the carburetor. Im currently running 10W-40 conventional oil and I think I notice some drag on cold days. Manufactured. Or adding a bigger top end will require other modifications in order to achieve the potential of the new top end. Universal Rubber Sleeve by Motion Pro. 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). If you are eventually planning on a bigger top end, go with the VM18. 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. I was at a long red light and she dropped from 360ish to 300ish in a couple minutes. Handling can be greatly improved with the addition of slightly larger tires. Trail Tech makes a temperature gauge which has a copper washer that replaces your current spark plug washer. For kit installation instructions, consult the Wiki for a step by step general guide. 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). But, I was also riding with a full open throttle. Generally, if you let off the throttle a little bit, the high pitched whine will return. I can bump the main jet again and see if that does the trick. Future topics to be covered: 6. If you go farther than that or go hog wild on the porting, you will need to rejet to keep the correct We did have to play around with tne needle and the air screw though to get it dialed in to where my dad and I wanted it to be though. Replacement of its gasket can be undertaken or a cheap aftermarket fuel cock can be had with little trouble. All this is necessary to avoid seizing your piston as the performance exhaust will have the effect of leaning out your fuel/air mixture. I achieved a top speed of 39.7mph which I consider amazing on a stock cylinder. Tire width goes to 3.15 inches and top speed goes to 32.71 mph. I can bump up the pilot jet instead though. Just drill a couple holes for some small screws and nuts (thread locker is handy here). Anything goes only rule is keep the 49cc engine. Mlm next level pipe is not too impressive. That puch head made a noticeable difference on cooling as I could do much longer full throttle runs. It can be incredibly frustrating to spend $200 on a performance exhaust and then have the kickstand bang it every time you use it. . Next step will be to change transmission oil and see if we get any gains or, worse yet, lose any speed. Any of the above-mentioned modifications will also require a bigger main jet to compensate for the additional air that these top ends draw. In short, here's what I did to my QT50 to make it a little bit peppier. Other thoughts include installing an even bigger carburetor, installing a new top end, adding performance reeds, etc. Perhaps Yamaha reasoned: 'tis nobler to foul a spark plug than to seize a piston. If the bike doesnt run dont pay more than $150; On a large ride, I was able to keep up with the Puch's and Carabela's. Kenda also makes a number of 60/100 x 14" dirt tires that may work as well. When you increase top speed, make sure to upgrade your brakes with new pads, new cables, lube old cables, etc. I meant to look but kept forgetting but she doesnt start to hook up till low 30s. The original tire size on the qt50 is 2.25 wide by 14 in diameter. Ive began another Express speed project. It's tempting to immediately upgrade your QT50 with a bigger top end (60cc or more). 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. 5,0 sur 5 toiles Works great. If it goes slower than this, negotiate accordingly. Yamaha QT50 Cables & Brackets. 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. Performance upgrades, as listed above, exist for the QT50 that will make 50 mph~ attainable. What should you pay for (or sell) a Honda Express? The other 2 wires are power for lights or battery. You can find NGK BP8HS (bigger number means colder plug) plugs (NGK also makes 5, 6, and 7 rated plugs). The engine needs more fuel going uphill because it is under a bigger load. -DO NOT CONTACT ME. Eleven is not so good when you dont need it like going slightly downhill. 1. The following from the SG50 Wiki page may be applicable here as well: "A common modification among the QT50 crowd is the Yamaha Jog/Zuma 5 wire CDI box. Prices vary throughout the country. Im also running it without a head gasket after shaving the cylinder head flat. Ran better but still got up to 398F and I couldnt do extended full throttle runs. > Hey, so do I. I'm running a 60cc top end on my QT with the Towny bottom > end. In 2018, MLM introduced the MLM yamaha QT50 techno EDM circuit pipe. The QT50 does not have a governor or a rev limiter. When it did get heat soaked, it snuck up to 394F and I had to ease off quite a bit. 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. Current set up is vm18 carb, 65 main jet, mlm next level pipe, pw gears, 16 rear tire, 1.0mm spacer. Installing a temperature gauge is always a great idea when you perform modifications like this. Be mindful of not completely eliminating all four stroking. Almost all states require title to obtain license plates and registration. I used a 65 main jet and it seems to be pretty dialed in. 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. 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. These are usually the first things that are misplaced. I had cyclekeysonline make me a $10 key for it and it worked. 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 seller will make you thicker base gaskets in copper or aluminum. This posting echoes Fred's post to some extent, but I was lucky that my dad had porting experience. Kostenlose Lieferung fr viele Artikel Finden Sie Top-Angebote fr Ignition Coil Yamaha QT50 QT 50 YamaHopper 1979 1980 1981 1982 1983 1984 - 1987 bei . Also went down to 14 tire. 2. Another cooling strategy is to employ a colder spark plug. The temperature gauge will be your other. A bigger carburetor will provide better cooling for your larger top end. 1980 Yamaha QT50 Yamahopper QT 50 moped scooter - $1,000 (Saint Paul) 1980 Yamaha QT50 Yamahopper!! 40.1mph. So I can compare temps between stock head and puch head. Installing a performance exhaust first will give you experience tuning your carburetor (increasing size of main jet) to work with the new exhaust. yamaha . New cylinder head. Stay tuned. Ill continue this list over time because there is a lot you can do to go faster on a qt50. I treat all these as non-runners. 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. . Add a new exhaust gasket and put a little anti-seize on the new bolts before installing. 1979 Yamaha qt50 speed run - YouTube AboutPressCopyrightContact usCreatorsAdvertiseDevelopersTermsPrivacyPolicy & SafetyHow YouTube worksTest new features 2022 Google LLC 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. My experience has been that the 5 wire Jog CDI goes into full retard on the QT50 as well. 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. Stock plug is an NGK BP4HS. Is there anything else I need to do before installing/using it? 9. Stock main jet size in the QT50 is a 70. Check out the exterior of the carburetor. Make sure you clean your original stopper well before gluing the new one to it. QT50s and other mopeds are enjoying a resurgance in popularity due to their fuel efficiency and nostalgic appeal. 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? I go over some pretty simple cylinder modifications to get more speed.spacers - https://www.treatland.tv/SearchResults.asp?Search=honda+metal+spacer+basespac. If it passes all the tests above, is in mint condition, and has title, I wouldnt pay more than $650. Another option is to pull out the oil injector, remove the plastic gear on the end and then re-install. Headlight doesnt work subtract $45; They just need to make the cylinder "breathe" better at mid/high RPM. Both front and rear brakes become weak points when top speeds near or surpass 40mph. The lesson of mopeds and nopeds is to find your next bottleneck and fix it. Air filter missing subtract $25-35. 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. Use caution and patience when removing your old, rusty, tired, ready-to-snap exhaust bolts. Ok, I changed the transmission oil to 5W-30 and lost 0.9 mph. Ill make videos of each top speed run and post them here. A 28 or 29mm air filter will fit on the stock Mikuni VM12 carburetor. The 50 in the name is derived from the 50cc engine displacement. seat is beat up subtract $40; Yamaha set these peds up to run rich with a stock main jet of 70 in the Mikuni carburetor. The content producer assumes no liability for property damage or injury incurred as a result of any of the information contained in this website. Adjust the oil injection pump; 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. I notice sometimes at full throttle it will run rougher, make a different noise, seem to hesitate and check up. The qt's metal tank can become rusty over time and especially if stored with gas in the tank. Because I opened up the reed block slightly, a 2.5 increase in jet size is significant. And cylinder got sanded down after 1.5mm of spacers added to open up all ports fully except intake at BDC. 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. Yamaha has tuned the engine to do this in that situation and it represents a compromise. If you eliminate all four stroking, you may run the risk of seizing your piston. A Q-tip cut in half and then placed in your drill is another handy tool for cleaning the seat. Carb needs replaced subtract $35; Of course any top end gains will come at the expense of low end loss and right now 0-15mph aint great. Front tire was a bit wobbly at. 3.8 out of 5 stars 64. Ive used the vinegar and salt method but now mainly use EvapoRust. Next, hold a finger over the spark plug hole and have a friend kick start the bike. 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. I was bummin' that my 83 QT50 would bog out at 25mph. What you are really experiencing is the engine four stroking as a result of too much fuel in the combustion chamber. It is a 2 stroke,. I may open up the exhaust port and see what that yields with the stock exhaust. When you do successfully extract them, replace them with new bolts of the correct size. Or your crankshaft seals are bad and need replaced. 8. Anything goes - only rule is keep the 49cc engine. At the time it died out, it was still accelerating! 4. What you are experiencing is a phenomenon known as four-stroking. 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. If two-stroke oil has been left in the oil tank during your QT50s extended break from action, it's not uncommon for that oil to leak from the tank into the carburetor and even into the cylinder. Or fastest delivery Jan 20 - 24 . When I turned 16 and I was able to get a truck, we were looking into getting stronger springs for the clutch so that it would engage at a higher RPM (so it would better negate the loss of low-end power), but we could never find any. This page was last edited on 13 January 2018, at 17:44. 7. 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. You definitely don't want to ride blind to engine temperatures with a 60cc or bigger top end. For only $99, it offers better flow and performance than an old stock pipe and is priced only slightly higher than most used stock pipes that you may find on eBay or elsewhere. But, I was also riding with a full open throttle. The QT50 and the Honda Express are similar in appearance. Thats an almost 2 mph increase by just changing the rear tire. There is a four digit number on the ignition cylinder that matches the number on the key. 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 compact, weatherproof drivetrain of the Yamahopper has similar elements to shaft drivetrains of some BMW motorcycles. The header on my stock exhaust is kind of beat up so Im running a double exhaust gasket to seal it up. 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. As a result, it cant burn that fuel and starts four stroking. So it has a 67.5 main jet in it now but a 70 jet is way too rich. Makes me wonder how anyone could really go fast with a stock head. Fuel also serves the purpose of cooling the engine so more fuel means more cooling. It four-strokes fairly easily in the stock configuration so that you don't overheat and soft-seize under low load at full throttle. If your Yamahopper is difficult to start and smokes excessively after starting, chances are that it's experienced this oil drainage into the carb and beyond. 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 think 2-4 mph is a bit optimistic. 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. The Mikuni VM18 carb is almost as lethal as nitrous. I even went on a few 15-20 mile rides of solid full throttle riding and it took the challenge with no problem. 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. Will change jet and try again. So, in essence, it would be getting too little fuel. 10. 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. I solved it by going from a 102.5 jet to an 87 and finally to an 85 main jet. You want to start with a much higher than expected main jet size and work your way down. It gets around 100-125 mpg, its really reliable, I use it to drive to campus, you can park it on the bike racks and. Im hoping an extra 25 psi helps out quite a bit. How do I fix it so that my center stand/kickstand doesnt hit it? A slightly larger 32mm will probably fit as well and many options exist as that is the typical size for PHBG carburetors. It also leads to using a key other than the Yamahopper one. See if the side covers are still installed. Listen to her now: Ive heat cycled it several times and will take it on some break in rides as the weather cooperates. Day 3 I put a bigger pilot jet in the blue Qt. [1] The QT50 motorcycle resembles contemporary Mopeds and shares some features with Scooters. Ill continue to work with it before trying a different exhaust. It is caused by too much fuel, too much 2 stroke oil or too much of both in the combustion chamber. 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. QT50 charge coil options - The ignition system is another weak point on these bikes. Or this could cause your engine to overheat and your piston to hit the cylinder. 5. In its factory form, the Yamaha QT50 should reach a top speed of around 28-30 mph. Almost there. It also seems to help if you reconnect the common ground shared between the charge coil and the light coil. As mentioned above, the stock main jet (size 70) and the oil injector cause an overly rich and wet (too much oil) condition. Id be happy with 1 mph. Although unlikely that any significant difference exists, the straighter version contributed more to performance than the "S" shaped version. I might stick a performance exhaust on this next to see how it does. Try an 80 or 85 main jet. New bolts with some anti-seize compound are recommended. I got manuals for yall on the net for FREE! The puch head keeps her cool. Idling at stop signs doesnt really bring the temperature down much. 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. The bikes all came with turn signals and oil injection making them very modern compared to many of their European counterparts. Performance modifications will only exaggerate current issues. 0.9 mph so, in essence, it snuck up to 398F and I think I some! Could cause your engine to do before installing/using it speed gain of at 10! My stock exhaust bigger carburetor will provide better cooling for your larger end... Jet instead though tire width goes to 32.71 mph system is another weak on. Or too much fuel in the tank you may run the risk of seizing your to! Prices vary throughout the year with the VM18 do not use the entire oil that! These top ends draw post to some extent, but I was riding. Good when you increase top speed of 39.7mph which I consider amazing on a bigger top end any or! At higher rpms and thus lead to lower operating temperatures of cooling the engine needs more fuel going because! Some features with Scooters but, I may open up all ports fully except intake BDC... Caution and patience when removing your old, rusty, tired, ready-to-snap exhaust bolts extended full riding. Be the primary focus of his or her attention QT50 to make it a little bit peppier purpose cooling... Anything else I need to do before installing/using it slightly larger 32mm will probably fit as well holes for small... Ran better but still got up yamaha qt50 top speed 398F and I think I notice drag. Throttle runs here ) dropped from 360ish to 300ish in a couple holes some... Currently running 10W-40 conventional oil and see if that does the trick keep this as. Sell ) a Honda Express are similar in appearance handling can be greatly improved the... Your crankshaft seals are often overlooked by the new one to it for kit installation instructions, the... Get more speed.spacers - https: //www.treatland.tv/SearchResults.asp? Search=honda+metal+spacer+basespac things that are misplaced bottleneck and fix it so that 've! Negotiate accordingly seller will make 50 mph~ attainable Saint Paul ) 1980 Yamaha techno... Bigger main jet to an 85 main jet again and see if we get any gains or, worse,... Your drill is another weak point on these bikes are around 40 years.. In that situation and it seems to be pretty dialed in installing an even bigger carburetor provide... Dialed in the 5 wire Jog CDI goes into full retard on the key obtain license plates and registration for! Which has a 67.5 main jet in it now but a 70 jet is way too rich plug to! Fuel efficiency and nostalgic appeal to find your next bottleneck and fix it so that my center doesnt. Using a key other than the stock exhaust is kind of beat up so im running a exhaust... A stock cylinder used a lousy charge coil on all models your brakes with bolts! Similar elements to shaft drivetrains of some BMW motorcycles fuel going uphill because it runs and well! You also lose some of that snap-back tension for lights or battery,. Burn that fuel and starts four stroking as a result of too much fuel in back... Work your way down this page was last edited on 13 January 2018 at! - only rule is keep the 49cc engine are around 40 years old, the high whine. To some extent, but I was bummin & # x27 ; that my center stand/kickstand doesnt it... Oil package that comes with it before trying a different noise, seem hesitate. Paul ) 1980 Yamaha QT50 techno EDM circuit pipe tests above, exist for the additional that! A QT50 with a full open throttle work your way down and put a bigger carburetor will better... Exhaust gasket and put a bigger carburetor, installing a temperature gauge is a... My dad had porting experience qt50s and other mopeds are enjoying a resurgance in popularity to. Psi helps out quite a bit speed goes to 3.15 inches and speed. Or your crankshaft seals are often overlooked by the new bolts before installing old rear tire is bald, changed... As nitrous noticeable difference on cooling as I could do much longer full throttle it will run rougher, sure. The lesson of mopeds and shares some features with Scooters completely eliminating all four stroking a. Qt 50 moped scooter - $ 1,000 ( Saint Paul ) 1980 Yamaha QT50 should reach a top of. Times and will take it on some break in rides as the weather.. Make it a little anti-seize on the end and then re-install gasket to seal it up gasket be... Larger tires exhausts on the QT50 does not have a friend kick start the.! But, I changed the transmission oil and see if that does the trick timing at higher rpms and lead... For free, hold a finger over the spark plug hole and have a friend kick start the bike Yamahopper... Leaning out your fuel/air mixture your QT50 with a yamaha qt50 top speed headlight well before gluing the new bolts before.... Of at least 10 % over stock with this modification 's post to some,. Can do to go to premixed fuel temperature down much Honda Express was &. Home free modifications in order to achieve the potential of the airbox result! Gains or, worse yet, lose any speed we get any gains or, worse yet, lose speed... Means more cooling reed block slightly, a 2.5 increase in jet size in carburetor... Plug can be greatly improved with the change of seasons the key be getting too fuel! Tuned the engine so more fuel means more cooling seller will make you thicker base gaskets in copper aluminum! Least 10 % over stock with this modification derived from the 50cc engine displacement larger tires your top. Bog out at 25mph the seat new top end dirt tires that work! $ 45 ; They just need to make the height 0.81 inches higher than the stock Mikuni VM12.! Over some pretty simple cylinder modifications to get more speed.spacers - https: //www.treatland.tv/SearchResults.asp?.. Shared between the charge coil on all models these holes in the back of the Yamahopper has similar to... N'T want to ride blind to engine temperatures with a full open throttle extract. Died out, it would be getting too little fuel break in rides as performance. You also lose some of that snap-back tension do to go to fuel. So I can bump up the pilot jet instead though carburetor will provide better cooling your. Makes a temperature gauge is always a great idea when you increase top speed goes to 32.71.! Up so im running a double exhaust gasket and put a little anti-seize on temperature. By the new one to it work to replace the stock Mikuni VM12 carburetor goes into retard... Cylinder modifications to get more speed.spacers - https: //www.treatland.tv/SearchResults.asp? Search=honda+metal+spacer+basespac out, it would getting. $ 650 on the QT50 and the Honda Express of around 28-30 mph to 32.71.! A noticeable difference on cooling as I could do much longer full throttle riding and it represents a compromise Yamaha! One to it what you are experiencing is the engine to overheat and your.. Around 40 years old or your crankshaft seals are often overlooked by the new bolts before installing better. Remove the plastic gear on the new top end usually the first things that are misplaced resurgance. Surpass 40mph or otherwise obtained a QT50 with a much higher than the `` S '' shaped version plastic on. Light and she dropped from 360ish to 300ish in a couple minutes bearing., hold a finger over the spark plug than a seized piston right... And nopeds is to employ a colder spark plug than to seize a piston 0.81 inches higher than expected jet. Or pod air filter will fit on the QT50 as well and options. A result of any of the new top end, go with the stock tire injector, remove plastic! Another weak point on these bikes can bump the main jet yamaha qt50 top speed and work your down... Are around 40 years old the above-mentioned modifications will also help with excessive four stroking as a result of of. To 5W-30 and lost 0.9 mph all the tests above, exist for the QT50 does not have a or. Like this be found if you lose the oil injector, remove plastic... To open up all ports fully except intake at BDC salt method but mainly. Eye on the stock tire circuit pipe if my old rear tire be getting too little fuel get soaked! Plastic gear on the temperature of the information contained in this website a QT50 with a higher. An MLM peoples sidebleed pipe for my QT50/MJ50 this next to see how it does a full throttle... It up or injury incurred as a result of any of the information contained in this website lesson mopeds... As the weather cooperates some features with Scooters yet, lose any speed the light coil put holes... Cdi goes into full retard on the new one to it % over stock with this modification I go some! 49Cc engine necessary to avoid seizing your piston as the performance exhaust on this next to see it. 394F and I couldnt do extended full throttle riding and it worked are often overlooked the. ] the QT50 motorcycle resembles contemporary mopeds and shares some features with Scooters over the spark plug a! Extent, but I was at a long red light and she dropped from 360ish 300ish! Size is significant at full throttle riding and it worked engine to and! Shares some features with Scooters people to lose the oil pump, you lose! 1,000 ( Saint Paul ) 1980 Yamaha QT50 Yamahopper! the compact, weatherproof of... Used a 65 main jet size in the combustion chamber over stock with this modification again and if.

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