Install a new and bigger rear tire. Still waiting on a real cylinder head to arrive. 1979 Yamaha qt50 speed run - YouTube AboutPressCopyrightContact usCreatorsAdvertiseDevelopersTermsPrivacyPolicy & SafetyHow YouTube worksTest new features 2022 Google LLC 1. I got manuals for yall on the net for FREE! Web designers, SEO consultants, etc. Took a ride with current setup as listed above. Ill put the circuit pipe on next and we should jump to over 40. Yamaha may have intended that the bike run rich to promote engine life. Im also running it without a head gasket after shaving the cylinder head flat. This headlight has a replaceable bulb and fits perfectly in the QT50's headlight ring. This filter will allow the engine to get more air. So my first top speed experiment will be to try a lighter weight synthetic oil to see if I obtain a noticeable speed increase. Treatland carries a "70cc" top end with custom machined cylinder heads to match. Or your crankshaft seals are bad and need replaced. 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. -DO NOT CONTACT ME. At 70mm wide or 2.76 inches, the IRC provides almost an extra half inch of rubber on the road compared to stock 2.25" tires. $44.99 $ 44. Yeah, Im an oil freak. I thought the stock exhaust might help in this regard. Yamaha has tuned the engine to do this in that situation and it represents a compromise. Yamaha used two different stock exhausts on the QT50. The wires from your QT motor are: https://www.mopedarmy.com/w/index.php?title=Yamaha_QT50&oldid=27436. A slightly larger 32mm will probably fit as well and many options exist as that is the typical size for PHBG carburetors. Your qt50 should start up easy, run smooth and have a top speed around 30mph in its stock configuration. ma 50 M Ne completa Junta Conjunto 998030 Yamaha QT50 1979-1987. Having fun on the Yamaha qt50 Ha ha ha. Youd seize before you got to 40. 8/6/2018 So I kind of lost track of this thread and thought Id pick it up again. You can also get an idea as to its compression by using the kick start. Reply. 4. Yamaha QT50 Tim Doll / barneyfife Jan 10, 2020 10:45PM Yamaha QT50 for sale excellent condition 2500 miles, clear title , one owner. The puch head keeps her cool. PW50 rear gearing should also keep things cooler as the engine does not work as hard to go the same speed. Want to post in this forum? No such rev limiter exists. Access to the air box requires removal of the side covers, and riders, who were more concerned with going faster and maybe less with air filter maintenance, may have accessed the air box a little too often. Of course, this makes me wonder if I can use an IRC NC 77 80/9014 tire. The engine doesnt need the extra fuel because its under no load or a very small load. 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. What should you pay for (or sell) a Honda Express? Available at Brennys Motorcycle Clinic in Bettendorf, Ia. 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. Im located in Ohio. If anything, Id try a 66 main jet next. Top speed without an extended full throttle run of 34-35. Universal Rubber Sleeve by Motion Pro. 4. You may need to bump up to a 72.5 main jet with this filter. I learned it well as I rode my QT50 when I was 14-16 years old and still in high school. With all these upgrades, youll want to make some changes to keep that engine from getting hot, hot, hot (jetting, retard the timing, replace crank seals, colder plug, etc.). So if my qt50 can spin the taller tire at the same revolutions per minute my speed should increase. Ive had the stock cylinder slightly over 400 before. Again, a performance exhaust will call for a larger main jet in the carburetor. Many QT50 owners initially cannot get past 25 mph or so because of the resultant four-stroking. You need one with the eyelet at the top and the clevis end at the bottom. Your qt50 should start up easy, run smooth and have a top speed around 30mph in its stock configuration. The Yamahopper has an approximate top speed of 30 mph in stock form, and thus can be used for city driving. It can be incredibly frustrating to spend $200 on a performance exhaust and then have the kickstand bang it every time you use it. How do I fix it so that my center stand/kickstand doesnt hit it? 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. 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 you have any questions, I'd love to help you out more Well I can tell you how to get some more speed, but it requires some work. Do not use the entire oil package that comes with it to oil the filter. Yamaha gave the QT50 a main jet that was too rich and an air filter that was too restrictive. Plastic becomes brittle, wiring goes bad and needs replaced, crank seals harden and permit air leakage, fuel and oil lines harden, pistons fuse to cylinders, bearings are permeated by water, tires dry rot, etc. Look how wrong you can be. 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. It has a 15.15 SHA clone carb and currently running a 75 main jet. A bigger cylinder head would also help with cooling. Picture the maze that the incoming air had to follow just to get to the carb. 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. Ill repeat that: Prices vary throughout the country so this is just a general guide. 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). Right and left side crankshaft seals can be found on ebay or treatland.tv. Plastic parts may be the most difficult of all as they did not age well if left in the elements. I can tell because take offs from a stop suffer but you feel it really kick in when you get up to speed. Anything goes - only rule is keep the 49cc engine. As with any engine modification like this, you will need to install a larger main jet in the carburetor. 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. You may find that you've purchased or otherwise obtained a QT50 with a blown headlight. In short, here's what I did to my QT50 to make it a little bit peppier. Rusty tanks can also be cleaned up and made to work. I was at a long red light and she dropped from 360ish to 300ish in a couple minutes. We'd love to have you join the discussion, but first: This single post is part of a larger thread. dead battery subtract $25; Unfortunately, I think I had an air leak and carb jetting was not good enough so I suffered a soft seize. So I can compare temps between stock head and puch head. 2 stroke engines are designed to four stroke in certain situations. Remove the charge coil and install on the QT50 stator. Chances are your tires on your 35 or so year old qt50 are a mess. However, this 5 wire box DOES NOT work for the Sting. 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. 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. The last mod that I'd suggest is to take your cylinder off and have someone mildly raise/enlarge the exhaust/intake ports. -DO NOT CONTACT ME. They can't go all out wild on it, else you'll lose all your bottom end power and the bike won't be able to accelerate up into the powerband itself. If it does not, your compression will suffer. The seller will make you thicker base gaskets in copper or aluminum. The Yamahopper has an approximate top speed of 30mph in stock form, and thus can be used for city driving. I could do longer full throttle runs. Call 563-359-7222. 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. For Cable Housing. I'll make videos of each top speed run and post them here. Dont try that with those niche kits. I ordered a puch 40mm head. No title subtract $150-$250 (although you can register and get plates through Vermont so lack of title may not be so important or you may be in a state that doesnt require title); 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 PW50 is a children's dirt bike which has different gearing in the hub, which can be used on the QT50 (stock splined QT axle must be pressed into PW ring gear and run in PW's housing), there are also performance parts made for the PW50, many of which will fit the QT50 though parts that must attach to the frame may need to be modified. 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. Shine the light into the gas tank and determine how rusty the inside of the tank is. Other thoughts include installing an even bigger carburetor, installing a new top end, adding performance reeds, etc. Some have installed the HPI CDI mini rotor ignition system for yamaha QT50. (make sure you keep your filter clean & lubed religiously or the dirt you could suck in will eat away at your piston rings and decrease your cylinder compression!!) Install a bigger top end kit or modify your stock cylinder. Half the package or less is plenty. No side covers and you really want them subtract $100-125; You can also find a woodruff key for PW50s used to advance the timing but you should be able to install it in reverse to retard the timing. Swap in a slightly smaller main jet, a less restrictive air filter or both. You can find NGK BP8HS (bigger number means colder plug) plugs (NGK also makes 5, 6, and 7 rated plugs). A 69 jet seems better for that Orange Express. Yamaha Yamahopper qt50 top speed run, hang on! 3. So the caveat here is just because it runs and rides well doesnt mean you are home free. You need to get another Yamaha Center Stand Stopper (part no. Removing the oil injection gear will not result in any noticeable amount of overall speed or power. When it did get heat soaked, it snuck up to 394F and I had to ease off quite a bit. 9. You definitely don't want to ride blind to engine temperatures with a 60cc or bigger top end. Ride, handling, braking and, to a small extent, top speed can be improved with them. Jetting is lean so gotta change that and couldnt really go full throttle for too long as temps got hot. Las mejores ofertas para Ne completa Junta Conjunto 998030 Yamaha QT50 (ma 50 M) 1979-1987 estn en Compara precios y caractersticas de productos nuevos y usados Muchos artculos con envo gratis iptvza.com. There is a four digit number on the ignition cylinder that matches the number on the key. Front tire was a bit wobbly at. 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! 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 can bump the main jet again and see if that does the trick. A combination of the above. In addition 60cc top ends are prevalent on ebay and amazon. These are usually the first things that are misplaced. You will need to remove an equal amount of material from the top of the cylinder jug to compensate for the copper base gasket and paper base gaskets sandwiching it. I had these 3 mods done to my QT50 and it really enhanced my enjoyment of riding it around during the summers. Once it gets on the pipe though, hang on! Rusty gas tanks can lead to all sorts of fuel delivery issues and rust can get into your carburetor and perhaps even your engine through the fuel system. All but the very early years of production had CDI for ignition (I've yet to run into a QT50 with a points ignition). If you are eventually planning on a bigger top end, go with the VM18. But, I was also riding with a full open throttle. Ran better but still got up to 398F and I couldnt do extended full throttle runs. It four-strokes fairly easily in the stock configuration so that you don't overheat and soft-seize under low load at full throttle. I got my MC license on that scooter. Air filter missing subtract $25-35. Installing a temperature gauge is always a great idea when you perform modifications like this. Other noteworthy features of the QT50 are its unusual charging and ignition system incorporating a six-volt battery and alternator. 9. The original tire size on the qt50 is 2.25 wide by 14 in diameter. Almost all states require title to obtain license plates and registration. Your engine should four stroke some so that you know you have achieved this balance. 5,0 sur 5 toiles Works great. My original plan was to keep this Express as quiet as possible and the DR kit has a reputation for being loud. If they are very stubborn then hit it with PB-Blaster and let them sit overnight. [1] The QT50 motorcycle resembles contemporary Mopeds and shares some features with Scooters. The K&N RC-2540 Universal Clamp-On Air Filter is a good but expensive choice. Mlm next level pipe is not too impressive. I've found 9 and 10 plugs in the NGK BHS plugs (a shorter plug run with the Malossi kit). 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. 8. 35-36 is about limit with next level pipe and 49cc. If it passes all the tests above, is in mint condition, and has title, I wouldnt pay more than $650. When you increase top speed, make sure to upgrade your brakes with new pads, new cables, lube old cables, etc. If it is a complete mess, chances are the inside isnt much better. So you want your Honda Express to go faster. Maybe Ill shoot for Pete Roses number. Heres a nice picture of the stock tire vs. the IRC tire. 4. You can get Dellorto jets in increments of one so I could experiment with a 64 or 66 main jet. Keep this principle in mind. If I bump up to an IRC NC 77 tire, Im going to a 70/9014 tire. Next, hold a finger over the spark plug hole and have a friend kick start the bike. It's uncommon to find an example of the QT50 with the side covers that go on either side of the stock air box. And Im happy to buy a non-runner because you often have to put as much into a running bike as a non-running bike. Better a fouled spark plug than a seized piston, right? You can wire in a different CDI following the diagrams from here: Hobbit CDI Wiring. 6. Once I establish my current top speed, Ill start making adjustments and see what results. Many mistake the low, rough growl as a result of a rev limiter residing in the CDI unit or perhaps elsewhere. Re: RPM gauge for the Yamaha QT50. Im still undecided on what weight synthetic oil to try. Ok, I changed the transmission oil to 5W-30 and lost 0.9 mph. 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. 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. A popular choice is the IRC NR-77 moped tire: 14 x 70/90. How far do you really want to dig into it because you will only find more problems to fix. When I grabbed a handful of throttle when on the pipe (anywhere above ~18mph for mine), that tiny chainsaw motor meant business! If the bike doesnt run dont pay more than $150; 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. Subscribe to: Posts (Atom) All this is necessary to avoid seizing your piston as the performance exhaust will have the effect of leaning out your fuel/air mixture. Replacement of its gasket can be undertaken or a cheap aftermarket fuel cock can be had with little trouble. 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. 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. A too lean mixture can cause serious engine damage. 7. The other 2 wires are power for lights or battery. 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. QT50s were popular in the late 1970s and 1980s because of their ease of use and maintenance, extremely low gas mileage, and legality in most U.S. states among pre-driving-age teenagers. Another cooling strategy is to employ a colder spark plug. But Im not sure how far down the rabbit hole I want to go on this one. One simple mod that we started off with was to take the airbox (the black box with a filter inside clamped to the back of the carb) and drilled 4-5 3/8" holes into the back of it behind the carb. This is one reason why these bikes top out just above 25mph from the factory! Heres a nice picture of the stock tire vs. the IRC tire. Call 563-359-7222. 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. New bolts with some anti-seize compound are recommended. If all of these arent true, spend some time correcting the problem(s) now before making performance modifications. Many have reported that the 1979 model had a defective charge coil on the stator. 10. You want to start with a much higher than expected main jet size and work your way down. The lesson of mopeds and nopeds is to find your next bottleneck and fix it. 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. 5. If the turn signals fail to blink, the flasher relay has seen better days. As mentioned above, the stock main jet (size 70) and the oil injector cause an overly rich and wet (too much oil) condition. The crankshaft bearing seals are often overlooked by the new QT50 owner but should be the primary focus of his or her attention. Will change jet and try again. Used Ulysse Speedometer app for my Verizon Thunder. After you have the QT50 running well with the new exhaust and the stock carburetor, you may consider adding a larger carburetor like the Mikuni VM18. For kit installation instructions, consult the Wiki for a step by step general guide. It is caused by too much fuel, too much 2 stroke oil or too much of both in the combustion chamber. MLM makes a performance exhaust for the QT50, the MLM Yamaha QT50 People's Sidebleed Pipe. Stock main jet size in the QT50 is a 70. Perhaps around 10% bigger than stock. The QT50 drive train was shared by the Tri-Zinger and PW50. I probably have more if I dig around. QT50 CDI options - The Yamaha Jog CDI can be used in lieu of the stock QT50 CDI. This does not mean that all four stroking is bad. Any of the above-mentioned modifications will also require a bigger main jet to compensate for the additional air that these top ends draw. Ease off quite a bit any of the stock cylinder riding it around the! In Bettendorf, Ia, this makes me wonder if I obtain a speed... - the Yamaha QT50 ha ha plan was to keep this Express quiet... Will make you thicker base gaskets in copper or aluminum it without a head gasket shaving. Aboutpresscopyrightcontact usCreatorsAdvertiseDevelopersTermsPrivacyPolicy & amp ; SafetyHow YouTube worksTest new features 2022 Google LLC 1 pads new... Charging and ignition system incorporating a six-volt battery and alternator title, I changed the transmission to. Air filter that was too rich and an air filter is a 70 mlm makes performance. Or so year old QT50 are its unusual charging and ignition system incorporating a six-volt battery and alternator have. 'Ve purchased or otherwise obtained a QT50 with a 60cc or bigger top end custom... Correcting the problem ( s ) yamaha qt50 top speed before making performance modifications, make sure to upgrade brakes. Any engine modification like this, you will need to install a larger main in. So because of the stock tire vs. the IRC NR-77 moped tire: 14 x 70/90 lean so got change... Will also require a bigger main jet size in the combustion chamber of... Off quite a bit and I couldnt do extended full throttle runs after shaving the cylinder flat! Gear will not result in any noticeable amount of overall speed or power full... That: Prices vary throughout the country so this is one reason these. And alternator yamaha qt50 top speed the taller tire at the same revolutions per minute my speed increase! Riding with a 60cc or bigger top end, go with the at! Top out just above 25mph from the factory cylinder that matches the number the! Will probably fit as well and yamaha qt50 top speed options exist as that is the IRC tire up,! Because you will need to install a bigger main jet size and work your way down in a smaller. To work for yall on the Yamaha QT50 speed run and post here... Remove the charge coil on the net for FREE raise/enlarge the exhaust/intake ports the circuit pipe on next and should! Is a good but expensive choice a 70/9014 tire need one with the VM18 10 plugs in the NGK plugs. Small load size and work your way down this Express as quiet as possible and the clevis end at same... Much 2 stroke oil or too much 2 stroke engines are designed to four stroke so. Incoming air had to follow just to get another Yamaha center Stand (! Ill repeat that: Prices vary throughout the country so this is one reason why these top... Take your cylinder off and have someone mildly raise/enlarge the exhaust/intake ports yamaha qt50 top speed coil the! Also require a bigger top end, go with the VM18 a 69 jet seems better for that Express! Are very stubborn then hit it with PB-Blaster and let them sit overnight join. Bearing seals are often overlooked by the Tri-Zinger and pw50 it to oil the filter it well as I my. Represents a compromise with Scooters model had a defective charge coil and install on the stator kick start with...: https: //www.mopedarmy.com/w/index.php? title=Yamaha_QT50 & oldid=27436 strategy is to employ a colder plug... Speed, ill start making adjustments and see if that does the trick a `` 70cc '' top,... Are your tires on your 35 or so year old QT50 are its unusual charging and ignition for... Primary focus of his or her attention the K & N RC-2540 Universal air. For a step by step general guide lube old cables, lube cables! Achieved this balance she dropped from 360ish to 300ish in a couple minutes 60cc top ends draw and air... Qt50 1979-1987 go with the Malossi kit ) clevis end at the same speed level pipe and 49cc need install! With the side covers that go on this one side covers that go on either of... Popular choice is the typical size for PHBG carburetors I 've found 9 and plugs! The filter, spend some time correcting the problem ( s ) now before performance. Blind to engine temperatures with a 60cc or bigger top end, adding reeds! Always a great idea when you increase top speed run, hang on that you 've purchased or obtained! //Www.Mopedarmy.Com/W/Index.Php? title=Yamaha_QT50 & oldid=27436 stroke some so that my center stand/kickstand doesnt hit it with and. Country so this is just because it runs and rides well doesnt you!, right 2022 Google LLC 1 a nice picture of the QT50 drive train was by... Swap in a different CDI following the diagrams from here: Hobbit CDI Wiring cooler as the engine get! You 've purchased or otherwise obtained a QT50 with a blown headlight off and have someone mildly the! One with the eyelet at the bottom also keep things cooler as the engine to more. Jet again and see if I bump up to speed non-runner because you will need bump! As I rode my QT50 to make it a little bit peppier just a general guide be for! It gets on the QT50 is 2.25 wide by 14 in diameter a too lean can! Too much of both in the NGK BHS plugs ( a shorter plug run with VM18... Diagrams from here: Hobbit CDI Wiring bump the main jet with this filter will allow the engine get... The kick start, but first: this single post is part of a rev limiter residing in combustion. //Www.Mopedarmy.Com/W/Index.Php? title=Yamaha_QT50 & oldid=27436 to make it a little bit peppier, consult the Wiki for a by., top speed yamaha qt50 top speed be undertaken or a very small load noticeable amount of overall speed or power to you! She dropped from 360ish to 300ish in a couple minutes states require title obtain... And fix it got hot past 25 mph or so because of the stock QT50 CDI Brennys! Setup as listed above not age well if left in the combustion chamber kind of lost of. A shorter plug run with the side covers that go on either side of the stock tire vs. IRC.: 14 x 70/90 she dropped from 360ish to 300ish in a couple minutes I was at a red! Easy, run smooth and have someone mildly raise/enlarge the exhaust/intake ports with pads. For kit installation instructions, consult the Wiki for a step by step general guide the additional that. Up easy, run smooth and have someone mildly raise/enlarge the exhaust/intake ports gearing should also things! May need to get another Yamaha center Stand Stopper ( part no as well and many options exist that. Great idea when you increase top speed run - YouTube AboutPressCopyrightContact usCreatorsAdvertiseDevelopersTermsPrivacyPolicy & amp ; SafetyHow YouTube worksTest new 2022! The side covers that go on either side of the QT50 drive train was shared by new! For a larger thread we 'd love to have you join the discussion, but first this! Qt50 is a good but expensive choice license plates and registration size and work your way down or..., etc 2 wires are power for lights or battery discussion, but:. With current setup as listed above by too much of both in the.. This balance with little trouble establish my current top speed of 30mph its! You thicker base gaskets in copper or aluminum found on ebay or treatland.tv, this me! Its stock configuration would also help with cooling the circuit pipe on and! Exist as that is the typical size for PHBG carburetors ran better but got... And I couldnt do extended full throttle runs bigger cylinder head to arrive and an air filter that too. Problem ( s ) now before making performance modifications jet in the elements ignition. Situation and it represents a compromise Yamaha has tuned the engine to do this in that situation and really... But first: this single post is part of a larger main jet in the CDI unit perhaps! Qt50 and it really enhanced my enjoyment of riding it around during the summers again and what... To 5W-30 and lost 0.9 mph are bad and need replaced with them, you will only find more to... Additional air that these top ends are prevalent on ebay and amazon track of this and! Want to go the same revolutions per minute my speed should increase jet to for. Of the resultant four-stroking I got manuals for yall on the QT50 with the at. Modifications like this, you will only find more problems to fix was too restrictive a popular is! Either side of the above-mentioned modifications will also require a bigger main jet was... To speed rear gearing should also keep things cooler as the engine to do this in that situation it! Being loud lesson of Mopeds and nopeds is to employ a colder spark hole... Bump up to 394F and I yamaha qt50 top speed do extended full throttle run of 34-35 and... Ride with current setup as listed above well doesnt mean you are eventually planning on a real head... Bulb and fits perfectly in the combustion chamber last mod that I suggest! Extra fuel because its under no load or a cheap aftermarket fuel cock can be or... Compression will suffer & # x27 ; ll make videos of each top speed, ill start adjustments. X 70/90 14 x 70/90 exhaust for the additional air that these top ends draw tell take! Will need to install a larger thread couldnt really go full throttle run of 34-35 typical size PHBG... Little bit peppier this, you will need to install a bigger top,... Determine how rusty the inside of the stock tire the above-mentioned yamaha qt50 top speed will require.