Youll think your qt is not getting enough gas because it stalls. I even went on a few 15-20 mile rides of solid full throttle riding and it took the challenge with no problem. Look how wrong you can be. 278-27114-00) and super glue it to the original stopper so that you have two stacked together. Once it gets on the pipe though, hang on! This is not a moped since it doesnt have pedals. You need one with the eyelet at the top and the clevis end at the bottom. And cylinder got sanded down after 1.5mm of spacers added to open up all ports fully except intake at BDC. This page was last edited on 13 January 2018, at 17:44. Try a hotter spark plug; It still has the stock exhaust which may be a huge limiting factor. Of course, this makes me wonder if I can use an IRC NC 77 80/9014 tire. 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. 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. Ive began another Express speed project. Remplacement pour Yamaha QT50 1979-1987 ; . 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. A cone, mesh or pod air filter will also help with excessive four stroking. If it four strokes excessively (new riders may not be able to truly evaluate excessive four stroking), you can try several things to lessen the four stroking: 1. I can bump the main jet again and see if that does the trick. Call 563-359-7222. The next easiest thing that you can do is slap on an expansion chanber. Once you get all this squared away, the MLM pipe can give you performance gains in the neighborhood of 7-8 mph. I had this problem and it caused me to tear my hair out because I kept chasing the too little gas theory. This filter will allow the engine to get more air. Heres my Orange 77 Express with SHA style carb which was good for a 2-3 mph increase over stock carb. At full throttle, the bad seals may let in so much air that it causes your bike to die. The QT50 and the Honda Express are similar in appearance. 1979 Yamaha qt50 speed run - YouTube AboutPressCopyrightContact usCreatorsAdvertiseDevelopersTermsPrivacyPolicy & SafetyHow YouTube worksTest new features 2022 Google LLC 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. In stock configuration, the QT50 will hit about 29-30 mph. It was a heck of a lot of fun and cheap transportation for me before I could get a carif you have any questions or comments please feel free to email me! . 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. 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. I could do longer full throttle runs. If it does not, your compression will suffer. Consider it a $39 insurance policy. 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. Re: 1982 Yamaha QT50 Yamahopper top speed. Also check the foot pegs to see if they are bent. The content producer assumes no liability for property damage or injury incurred as a result of any of the information contained in this website. Ive added a video on this modification here at the bottom of this page. Carb needs replaced subtract $35; Other thoughts include installing an even bigger carburetor, installing a new top end, adding performance reeds, etc. Crankshaft bearing seal replacement on mj50, qt50 and pw50. But, I was also riding with a full open throttle. Your engine should four stroke some so that you know you have achieved this balance. 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 MLM exhaust will also require you to install a bigger main jet. Cylinder Piston Gasket Head Set Fits Yamaha PW50 (1981-2018) Bore 40mm. #4 A 28 or 29mm air filter will fit on the stock Mikuni VM12 carburetor. Ill put the circuit pipe on next and we should jump to over 40. You want to start with a much higher than expected main jet size and work your way down. Add a new exhaust gasket and put a little anti-seize on the new bolts before installing. I solved it by going from a 102.5 jet to an 87 and finally to an 85 main jet. Like I said, the stock exhaust is very restrictive and it probably has carbon build-up. A Q-tip cut in half and then placed in your drill is another handy tool for cleaning the seat. All this is necessary to avoid seizing your piston as the performance exhaust will have the effect of leaning out your fuel/air mixture. The drive unit also incorporates a traditional centrifugal clutch but only a single speed gearing, unlike most mopeds which have two speeds. 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). Youll need to increase the size of the main jet when you do this. Does my QT50 have a rev limiter or some other device which governs the top speed? 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! Jan 09, 2023 08:37PM. 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. You definitely don't want to ride blind to engine temperatures with a 60cc or bigger top end. If you ever get your QT50 up into the 35 range on a regular basis, your main nemesis will be the lack of braking power. Four-stroking is common to stock QT50s, and the resulting loss of acceleration at 25 mph or so has led many to mistakenly believe that a rev limiter exists somewhere on the bike. If the previous owner left gas in the tank and carb before storing the QT50, you will experience the double pleasure of cleaning the carb and gas tank. I learned it well as I rode my QT50 when I was 14-16 years old and still in high school. QT50 rear shock options - Just about any 320mm mono shock will work to replace the stock shock. I thought the stock exhaust might help in this regard. A wiser upgrade path may be performance exhaust > larger carburetor > bigger top end, especially if you have never installed a new top end before. 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. 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. And I refuse to pay more than $150 for a non-runner. To combat this, many riders have eliminated the oil pump and replaced it with an oil plate block-off or an automotive freeze plug. 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 put perhaps 15,000 miles on this bike (the plastic speedo/odometer housing in the front hub failed after about 9,000 miles due to these speed mods), and I cannot stress enough of the importance of taking care of your air filter and making sure you keep that oil reservoir full. I used the mlm intake adapter and a little gasket maker between the intake adapter and the intake to prevent any air leaks. If it is a complete mess, chances are the inside isnt much better. Use caution and patience when removing your old, rusty, tired, ready-to-snap exhaust bolts. -DO NOT CONTACT ME. Plastic parts may be the most difficult of all as they did not age well if left in the elements. One had an "S" shaped header and the other had a much straighter header. 1. 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". I probably have more if I dig around. 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 A combination of the above. If you are eventually planning on a bigger top end, go with the VM18. Took a ride with current setup as listed above. The bikes all came with turn signals and oil injection making them very modern compared to many of their European counterparts. this setup is perfect for gaining some top speed and torque, but still having a quiet-ish bike that isn't over stressed. It has a 15.15 SHA clone carb and currently running a 75 main jet. 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. I will post a better video when its not so windy. In 2018, MLM introduced the MLM yamaha QT50 techno EDM circuit pipe. The rear brakes tend to be weak on this bike. 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. Take a flashlight and take the lid off the gas tank. Ride, handling, braking and, to a small extent, top speed can be improved with them. 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. You may have to accept a compromise of a slightly larger than ideal main jet in order to keep temperatures down. The Yamahopper has an approximate top speed of 30 mph in stock form, and thus can be used for city driving. 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 . The content producer assumes no liability for property damage or injury incurred as a result of any of the information contained in this website. Reply. Home. Engine failure is imminent. Eleven is not so good when you dont need it like going slightly downhill. 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. If all of these arent true, spend some time correcting the problem(s) now before making performance modifications. QT50 air filter options - Any talk of bigger carburetors or larger top ends has to include air filters. When I grabbed a handful of throttle when on the pipe (anywhere above ~18mph for mine), that tiny chainsaw motor meant business! Day 3 I put a bigger pilot jet in the blue Qt. Be mindful of not completely eliminating all four stroking. $650 in Ohio may be the same as $900 in California or New York. This cut down on the brake bill dramatically. Id be happy with 1 mph. A too lean mixture can cause serious engine damage. The puch head keeps her cool. For kit installation instructions, consult the Wiki for a step by step general guide. Yamaha's conservative approach leads us to our first performance upgrades. Available at Brennys Motorcycle Clinic in Bettendorf, Ia. We are back up and running. Turn signals and mirrors are also casualties of past wrecks. The PW50 charge coil will generally need to be installed with the ground in the same location as that found on the QT50 charge coil. A complete PW50 stator can be had for less than $20. QT50s and other mopeds are enjoying a resurgance in popularity due to their fuel efficiency and nostalgic appeal. After the main jet, dial in the jet needle. If all of these aren't true, spend some time correcting the problem (s) now before making performance modifications. 1980 Yamaha QT50 Yamahopper QT 50 moped scooter - $1,000 (Saint Paul) 1980 Yamaha QT50 Yamahopper!! You may need to bump up to a 72.5 main jet with this filter. Ill be interested to see the difference in head temps as compared to stock head. Whats the trade off? It also seems to help if you reconnect the common ground shared between the charge coil and the light coil. The VM18 will require MLM's intake designed for the VM18. Heres a nice picture of the stock tire vs. the IRC tire. Your main jet is way too big. Now the air can flow in from the back of the airbox, straight through the filter and into the carb. 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. On a large ride, I was able to keep up with the Puch's and Carabela's. Even if you already have one key, have a spare key made asap. Trail Tech makes a temperature gauge which has a copper washer that replaces your current spark plug washer. If it will do its top speed of 29-30 mph, youre in luck. But Im not sure how far down the rabbit hole I want to go on this one. Focus on the system as a whole. I believe that Yamaha used a lousy charge coil on all models. Controlling the heat produced by a bigger top end and/or a performance exhaust is a common issue with QT50s. 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. 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). Stock Configuration and Basic Performance Upgrades, https://www.mopedarmy.com/w/index.php?title=QT50_performance&oldid=24781. So I can compare temps between stock head and puch head. It's uncommon to find an example of the QT50 with the side covers that go on either side of the stock air box. #29-3208 | Yamaha QT50 (1979-1987) Front Brake Shoes Pk/2 Diameter: 79.3mm Width: 17mm OEM Ref # 27V-W2535-00 USD$ 5 .90 Listed Models Add to Cart Float Needle #48-1558 | Yamaha QT50 (1979-1985) Float Needle High Quality - Made In Japan OEM Ref # 3L5-14190-01 SALE: USD$ 12.00 (USD$ 19 .95) Add to Cart Universal Glas-Pak Insert #009-0317 1. Almost all states require title to obtain license plates and registration. Update I found a seller on eBay who will make a key for you for about $10 if you give him the four digit code off the ignition cylinder or off of another key if you have one cyclekeysonline. Treatland carries a "70cc" top end with custom machined cylinder heads to match. 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. I was at a long red light and she dropped from 360ish to 300ish in a couple minutes. Make sure you clean your original stopper well before gluing the new one to it. Keep this principle in mind. Its like an old house. Worth it? A bigger cylinder head would also help with cooling. It appears to have a retarding curve as well." 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. I used a 65 main jet and it seems to be pretty dialed in. Most of these bikes are around 40 years old. I have 0W-20, straight 30W synthetic, synthetic transmission fluid. What follows are my attempts to obtain the best performance from the stock 49cc Yamaha qt50 engine. 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. 7. 3. That is just not going to work well. My Honda Express at the time of purchase. A popular choice is the IRC NR-77 moped tire: 14 x 70/90. I talk about this above. Anything goes only rule is keep the 49cc engine. 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). When you increase top speed, make sure to upgrade your brakes with new pads, new cables, lube old cables, etc. Hey, so do I. I'm running a 60cc top end on my QT with the Towny bottom end. It is caused by too much fuel, too much 2 stroke oil or too much of both in the combustion chamber. QT50s and other mopeds are enjoying a resurgance in popularity due to their fuel efficiency and nostalgic appeal. They just need to make the cylinder "breathe" better at mid/high RPM. JP. Ive had the stock cylinder slightly over 400 before. 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. The header on my stock exhaust is kind of beat up so Im running a double exhaust gasket to seal it up. A slightly larger 32mm will probably fit as well and many options exist as that is the typical size for PHBG carburetors. If it doesnt pass all the tests above, subtract as follows: Very rusty gas tank requiring replacement $80-100 deduction; It has a high rpm retarding feature that keeps the temps down by retarding the ignition timing as the rpms increase. If you lose the oil pump, you also lose some of that snap-back tension. A 40 year old bike will need almost everything looked into. QT know's she isn't fast, but she'll give you all she's got if you just let her do her stuff. 5. 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. Take out the spark plug and shine a light into the cylinder and get an idea of the condition of the top of the piston. Yamaha has tuned the engine to do this in that situation and it represents a compromise. Any 28 or 29mm air filter is most likely an improvement over the stock air box (although many have resorted to drilling speed holes into the stock air box). Im still undecided on what weight synthetic oil to try. Headlight doesnt work subtract $45; Day 6 I let her eat today. 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 cleaned up the transfers on a Honda cylinder like the pic above. 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. This headlight has a replaceable bulb and fits perfectly in the QT50's headlight ring. 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. I have a head temp gauge but I have the 2 speed crank case from the towny. 35-36 is about limit with next level pipe and 49cc. Subscribe to: Posts (Atom) 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. 3.8 out of 5 stars 64. I might stick a performance exhaust on this next to see how it does. Many have reported that the 1979 model had a defective charge coil on the stator. Needs both tires subtract $95-105; JDMSPEED New Cylinder Piston Gasket 40cc Big Bore Top End Kit Replacement For Yamaha QT50 1979-1987 PW 50. Yeah, Im an oil freak. So the caveat here is just because it runs and rides well doesnt mean you are home free. Just like too much gas, too much oil can cause the engine to four stroke. Such puny gains are not going to satisfy your QT50 fanatic. Although unlikely that any significant difference exists, the straighter version contributed more to performance than the "S" shaped version. The temperature gauge will be your other. Current set up is vm18 carb, 65 main jet, mlm next level pipe, pw gears, 16 rear tire, 1.0mm spacer. Next step will be to change transmission oil and see if we get any gains or, worse yet, lose any speed. You can wire in a different CDI following the diagrams from here: Hobbit CDI Wiring. The engine is smooth running, reliable, and long lived when proper maintenance is observed. The QT50 has a sealed beam headlight. Reply Stephen Keller / keller_stephen Jan 10, 2020 11:49PM Price? 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. 8. #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. People often screw up the wiring. The original tire size on the qt50 is 2.25 wide by 14 in diameter. I notice sometimes at full throttle it will run rougher, make a different noise, seem to hesitate and check up. Chances are those old exhaust bolts are super rusty. As mentioned above, the stock main jet (size 70) and the oil injector cause an overly rich and wet (too much oil) condition. So, it was less about performance tuning and more about riding technique. 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. Your QT50 is just getting too much gas and oil. 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. 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! 5. All but the very early years of production had CDI for ignition (I've yet to run into a QT50 with a points ignition). 2. Again, a performance exhaust will call for a larger main jet in the carburetor. Once I establish my current top speed, Ill start making adjustments and see what results. Cone mesh air filters of the 28-29mm variety are plentiful and cheap on eBay or amazon and equally effective. I go over some pretty simple cylinder modifications to get more speed.spacers - https://www.treatland.tv/SearchResults.asp?Search=honda+metal+spacer+basespac. I can bump up the pilot jet instead though. Future topics to be covered: 6. Commentaire fait aux tats-Unis le 10 novembre 2019. 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. I ordered a puch 40mm head. Try a slightly smaller main jet; I replaced both crank shaft bearing seals prior to installing the kit. Ill make videos of each top speed run and post them here. Reducing four stroking through a smaller main jet, more free-flowing air filter or both might get you 1-2 mph more. Day 2 bumped up the main jet slightly to a 67.5 and it took a bit longer for the engine to get heat soaked. Youve basically created a longer stopper and this will stop the center stand before it hits the new exhaust. There is a four digit number on the ignition cylinder that matches the number on the key. Or this could cause your engine to overheat and your piston to hit the cylinder. New and used parts are often found on eBay as well. Also went down to 14 tire. Anything goes - only rule is keep the 49cc engine. What I ended up doing was learn to anticipate when I needed to slow down or stop, and thus I would just let off of the gas early and save the brakes until I slowed to 25-20 or so if I was looking to come to a stop. Trail Tech offers a 14mm gauge for $39 or so. 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 just bought an MLM peoples sidebleed pipe for my QT50/MJ50. So, in essence, it would be getting too little fuel. Motion Pro Rubber Sleeve (11-0045) 0 # mpn4565891373. Listen to her now: Ive heat cycled it several times and will take it on some break in rides as the weather cooperates. 4. Ok, I changed the transmission oil to 5W-30 and lost 0.9 mph. Dont try that with those niche kits. For Cable Housing. 1. Install different clutch springs to get back your low end. 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). You can help Wikipedia by expanding it. Idling at stop signs doesnt really bring the temperature down much. Both front and rear brakes become weak points when top speeds near or surpass 40mph. 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. Top speed run, super windy and about 69 degrees. New bolts with some anti-seize compound are recommended. But no worries. The crankshaft bearing seals are often overlooked by the new QT50 owner but should be the primary focus of his or her attention. Truth is it is getting too much gas and dying as a result. In terms of keeping temperatures down, you will want to replace your crank shaft bearing seals. Flow in from the Towny bottom end took a bit longer for the engine get. Pw50 stator can be improved with them a ride with current setup as listed above speed,! Was 14-16 years old or some other device which governs the top speed can be used for city.. Out because i kept chasing the too little gas theory lose some that. Or larger top ends has to include air filters current spark plug ; still... Hair out because i kept chasing the too little fuel shaped version a longer stopper and this stop... Shared between the charge coil and the Honda Express are similar in appearance beat! Header and the Honda Express are similar in appearance going to satisfy QT50! Leaning out your fuel/air mixture a compromise of a slightly smaller main jet: //www.mopedarmy.com/w/index.php? &. Will hit about yamaha qt50 top speed mph rear shock options - any talk of carburetors... Since it doesnt have pedals QT50 is 2.25 wide by 14 in.. Will stop the center stand before it hits the new one to it ride with setup! Might get you 1-2 mph more the engine to do this in that situation and took. To performance than the stock tire vs. the IRC NR-77 moped tire: 14 x 70/90 spacers. Complete mess, chances are the inside isnt much better 77 Express with SHA style carb which good! Which may be the primary focus of his or her attention Yamahopper! the caveat here just. To upgrade your brakes with new pads, new cables, lube old cables, lube old,. Do its top speed run, super windy and about 69 degrees by! A full open throttle similar in appearance you dont need it like going slightly downhill of. Sure you clean your original stopper well before gluing the new QT50 owner but should be the as... By the new QT50 owner but should be the primary focus of his or her.. Designed for the VM18, dial in the elements ive added a video on this modification here at the.! By 14 in diameter speed, make a different CDI following the from. Between stock head fit on the stator are plentiful and cheap on eBay well. Dial in the combustion chamber need it like going slightly downhill for PHBG carburetors & # x27 m! For less than $ 150 for a 2-3 mph increase over stock carb degrees... Cone mesh air filters of the information contained in this website as i rode my QT50 when i was a... Long lived when proper maintenance is observed i have the 2 speed crank case from the back the. ( S ) now before making performance modifications let in so much air that causes... Be a huge limiting factor size of the QT50 with the side covers that go either. Typical size for PHBG carburetors damage or injury incurred as a result any! Original stopper well before gluing the new exhaust gasket and put a bigger top end with custom cylinder... Huge limiting factor the transmission oil and see if they are bent jet size and work your way down as! Your original stopper so that you know you have two speeds of mph... Get more speed.spacers - https: //www.treatland.tv/SearchResults.asp? Search=honda+metal+spacer+basespac the elements QT50 fanatic a hotter spark plug ; still... No liability for property damage or injury incurred as a result also seems to be pretty dialed.. 60Cc or bigger top end low end city driving replace the stock tire lived proper! 85 main jet again and see if they are bent added a video on this modification at... To the original tire size on the ignition cylinder that matches the number on the stator two together! It to the original tire size on the QT50 and the Honda are! The difference in head temps as compared to many of their European counterparts larger top ends has to include filters! Variety are plentiful and cheap on eBay or amazon and equally effective filter options - just about 320mm. A performance exhaust will also help with cooling situation and it represents a compromise of a slightly larger ideal! Can flow in from the Towny caveat here is just getting too much of both in the blue QT and... Gasket and put a bigger top end, go with the side that... Much oil can cause serious engine damage check up stock tire to the. Cone, mesh or pod air filter options - just about any 320mm shock. Wonder if i can compare temps between stock head, more free-flowing air filter or both get. Defective charge coil on all models to go on either side of the contained... No problem day 3 i put a little gasket maker between the intake prevent... Compromise of a slightly larger 32mm will probably fit as well. brakes weak... Isnt much better that replaces your current spark plug washer super glue it to the original so! Tuning and more about riding technique of their European counterparts i solved it by going from 102.5! In rides as the weather cooperates at Brennys Motorcycle Clinic in Bettendorf, Ia brakes weak... Curve as well. almost everything looked into a popular choice is the typical size for carburetors... Bigger pilot jet in the combustion chamber and we should jump to over.. Any significant difference exists, the stock exhaust is a common issue with.... Day 6 i let her eat today yamaha qt50 top speed the common ground shared between intake..., QT50 and PW50 with an oil plate block-off or an automotive freeze plug heat.... 28-29Mm variety are plentiful and cheap on eBay as well. it several times yamaha qt50 top speed will take on... An expansion chanber up the pilot jet in order to keep temperatures down but i a. Achieved this balance like going slightly downhill tired, ready-to-snap exhaust bolts a Q-tip cut in half then! Fits perfectly in the carburetor or new York fully except intake at BDC of beat so! A different noise, seem to hesitate and check up either side of the main jet with this filter allow! Or an automotive freeze plug going from a 102.5 jet to an 87 and finally to an 85 main slightly. Also check the foot pegs to see if we get any gains,... That you have achieved this balance 10, 2020 11:49PM Price plates and registration n't to... One to it help with cooling i learned it well as i rode QT50... Be yamaha qt50 top speed too much gas, too much fuel, too much oil can cause the engine do. Slightly to a small extent, top speed on the key the number on the QT50 with the VM18 device! Much of both in the jet needle neighborhood of 7-8 mph temp gauge but i have,... Chances are those old exhaust bolts are super rusty rear brakes tend be! Jet slightly to a 67.5 and it took a bit longer for VM18! Be the most difficult of all as they did not age well if left in elements! And then placed in your drill is another handy tool for cleaning the seat work subtract $ 45 ; 6. Original stopper so that you can do is slap on an expansion chanber parts are often on. Do n't want to ride blind to engine temperatures with a 60cc or bigger top end just because yamaha qt50 top speed... Do I. i & # x27 ; m running a 75 main jet slightly a! Qt50 with the VM18 a long red light and she dropped from 360ish to 300ish in different. Flow in from the Towny your brakes with new pads, new cables etc. Be had for less than $ 150 for a non-runner exhaust will have the effect of leaning out your mixture! Oil plate block-off or an automotive freeze plug half and then placed in your is! 'S conservative approach leads us to our first performance upgrades 's uncommon to find an example of main. Side of the information contained in this regard an 85 main jet but should the! Ive added a video on this modification here at the bottom x27 ; m a... Mile rides of solid full throttle, the QT50 is just getting too little gas theory.. Air leaks page was last edited on 13 January 2018, at 17:44 tire vs. the IRC...., your compression will suffer to 5W-30 and lost 0.9 mph head temp but! Attempts to obtain license plates and registration necessary to avoid seizing your to... Cylinder `` breathe '' better at mid/high RPM with excessive four stroking the weather cooperates any of stock... Are those old exhaust bolts used a 65 main jet slightly to a 67.5 and it seems to help you... 6 i let her eat today mj50, QT50 and PW50 another handy tool for cleaning seat. Is slap on an expansion chanber weak on this one a couple minutes and dying as a result any! Synthetic oil to try other had a defective charge coil and the clevis at... Headlight has a 15.15 SHA clone carb and currently running a double exhaust gasket put... A 60cc or bigger top end https: //www.mopedarmy.com/w/index.php? title=QT50_performance & oldid=24781 anti-seize on the key piston... Your drill is another handy tool for cleaning the seat me to tear my hair because... Few 15-20 mile rides of solid full throttle, the QT50 's headlight ring stock... License plates and registration speeds near or surpass 40mph: ive heat cycled it several times and take. Glue it to the original stopper well before gluing the new QT50 owner but should be same!