yamaha qt50 top speed

Prices vary throughout the year with the change of seasons. In its factory form, the Yamaha QT50 should reach a top speed of around 28-30 mph. If you lose the oil pump, you also lose some of that snap-back tension. 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. 2 stroke engines are designed to four stroke in certain situations. Damn that was sweet! You need one with the eyelet at the top and the clevis end at the bottom. 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. this setup is perfect for gaining some top speed and torque, but still having a quiet-ish bike that isn't over stressed. Thanks to this handy calculator, I see that my speed at 30 mph with the old rear tire should now be 31.53 mph. Its like an old house. 9. Ive added a video on this modification here at the bottom of this page. Kenda also makes a number of 60/100 x 14" dirt tires that may work as well. QT50 charge coil options - The ignition system is another weak point on these bikes. For Cable Housing. Web designers, SEO consultants, etc. 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. Another option is to obtain a headlight for a Honda C70. -DO NOT CONTACT ME. This is the trade off for more top speed. A stock QT50 has a top speed of 30 mph, and takes a while to reach it. New tires may be in store for you as well. Re: I got manuals for yall on the net for FREE. Having fun on the Yamaha qt50 AboutPressCopyrightContact. When cleaning the carb, focus on the idle jet and the seat where the needle sits. 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. Generally, if you let off the throttle a little bit, the high pitched whine will return. Ill be interested to see the difference in head temps as compared to stock head. Headlight doesnt work subtract $45; Want to post in this forum? #29-3208 | Yamaha QT50 (1979-1987) Front Brake Shoes Pk/2 Diameter: 79.3mm Width: 17mm OEM Ref # 27V-W2535-00 USD$ 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 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. For example, adding a performance exhaust will most likely necessitate a larger carburetor which will require a larger intake. But, I was also riding with a full open throttle. If it is a complete mess, chances are the inside isnt much better. Perhaps around 10% bigger than stock. What you are experiencing is a phenomenon known as four-stroking. Reply Tim Doll / barneyfife OP Jan 11, 2020 12:19AM Sorry about that ,missed one small detail $650 Reply Bob Naske / bobqt50 Yamaha QT50 Tim Doll / barneyfife Jan 10, 2020 10:45PM Yamaha QT50 for sale excellent condition 2500 miles, clear title , one owner. 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. 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. New and used parts are often found on eBay as well. A Q-tip cut in half and then placed in your drill is another handy tool for cleaning the seat. I may open up the exhaust port and see what that yields with the stock exhaust. 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). 5,0 sur 5 toiles Works great. Dont try that with those niche kits. 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. Performance modifications will only exaggerate current issues. Once it gets on the pipe though, hang on! You may have to resort to the numerous methods outlined in this wiki for tackling iron oxide-laden fuel tanks. . You can find NGK BP8HS (bigger number means colder plug) plugs (NGK also makes 5, 6, and 7 rated plugs). Test your work by shining a flashlight through the slide chamber and into the main and idle jets. Other tire options (in stock at the time of editing) included Shinko SR244 Dual Sport tires (14"x2.75"); Shinko SR241 Dual Sport tires (14"x2.75"); vee rubber VRM 020 moped tire (14 x 2.25); irc inoue tire - (14" x 2.25") hod rodddder; Kenda K261(14" x 2.25"); Yokohoma World Tour 956 (14" x 2.25" and 2.00" - not sure if you can find this still); Guang Li Dirt Tire (2.50"-14"); Tyre HEIDENAU K66 (80/80-14" - may or may not work and may require loss of rear fender). Day 3 I put a bigger pilot jet in the blue Qt. 3. It has a high rpm retarding feature that keeps the temps down by retarding the ignition timing as the rpms increase. -DO NOT CONTACT ME. You may also choose to richen up your jet needle by moving the clip down one or more positions. Use caution and patience when removing your old, rusty, tired, ready-to-snap exhaust bolts. yamaha qt50 big bore party pack with pretty much all the stuff you need! Being made of plastic, the side covers wore where they attached and many side covers were most likely lost on the side of the road after an unfortunate bump or pothole rattled them loose. 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. 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). A 28 or 29mm air filter will fit on the stock Mikuni VM12 carburetor. If you are eventually planning on a bigger top end, go with the VM18. The stock main jet in a qt50 is a 70. The compact, weatherproof drivetrain of the Yamahopper has similar elements to shaft drivetrains of some BMW motorcycles. I meant to look but kept forgetting but she doesnt start to hook up till low 30s. Do not use the entire oil package that comes with it to oil the filter. Caveat: I have found air filters that require a larger main jet so make changes one at a time and observe the results and then proceed from there. At full throttle, the bad seals may let in so much air that it causes your bike to die. Current set up is vm18 carb, 65 main jet, mlm next level pipe, pw gears, 16 rear tire, 1.0mm spacer. Or fastest delivery Jan 20 - 24 . Stock main jet size in the QT50 is a 70. 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. Subscribe to: Posts (Atom) 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. Yamaha used two different stock exhausts on the QT50. 10. So I can compare temps between stock head and puch head. The QT50 does not have a governor or a rev limiter. The YF60's(quad), YT60's(atv), MJ50's, and PW50's (dirtbike) engines were all derived from the QT50's engine and all parts are interchangeable though some parts are slightly different, for example all model's right side crankcase half have right side trailing arm mounts, except for the QT50. Installing a performance exhaust first will give you experience tuning your carburetor (increasing size of main jet) to work with the new exhaust. 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. Crankshaft bearing seal replacement on mj50, qt50 and pw50. The qt's metal tank can become rusty over time and especially if stored with gas in the tank. So if my qt50 can spin the taller tire at the same revolutions per minute my speed should increase. Even if you already have one key, have a spare key made asap. The QT50 and the Honda Express are similar in appearance. Rusty tanks can also be cleaned up and made to work. Any of the above-mentioned modifications will also require a bigger main jet to compensate for the additional air that these top ends draw. I thought the stock exhaust might help in this regard. QT50s and other mopeds are enjoying a resurgance in popularity due to their fuel efficiency and nostalgic appeal. If all of these aren't true, spend some time correcting the problem (s) now before making performance modifications. To combat this, many riders have eliminated the oil pump and replaced it with an oil plate block-off or an automotive freeze plug. Swap in a slightly smaller main jet, a less restrictive air filter or both. Your qt50 should start up easy, run smooth and have a top speed around 30mph in its stock configuration. The Tri-Zinger has a 60cc version of this engine and the cylinder can be installed on the QT50. You more than likely over-jetted. Im located in Ohio. One replacement option is to carefully break out and remove the bulb and cut a slightly bigger opening (if necessary) for a replacement bulb (see the wiki for sealed beam conversion tutorial). In the end, I was able to get the QT50 consistently up into the 35-40 mph range even on slight uphills, and I was able to almost hit 50 going downhills and also by catching a lucky draft from an SUV on level ground (which was probably one of the dumbest things I've done in my life so far). Ive had at least two qt50s with bald back tires. 5. The straighter header will perform better; however, a used QT50 exhaust cannot be had for pennies on ebay and your money may be better spent on a performance exhaust. Of course, this makes me wonder if I can use an IRC NC 77 80/9014 tire. QT50 Exhaust options include the MLM People's Sidebleed pipe; the tomos A35 biturbo pipe (will require slight modification to flange and additional bracket for mounting); and, if you can weld or have access to someone who can, anything you can weld on to the stock header. 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. QT50 CDI options - The Yamaha Jog CDI can be used in lieu of the stock QT50 CDI. 7. But Im not sure how far down the rabbit hole I want to go on this one. If the bike doesnt run dont pay more than $150; You can still find a rev plate on ebay but under the moniker, "copper base gasket". I put 15,000 mile's on it. 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. This top-grade product is expertly made in compliance with stringent industry standards to offer a fusion of a well-balanced design and high level of craftsmanship. Available at Brennys Motorcycle Clinic in Bettendorf, Ia. 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. New bolts with some anti-seize compound are recommended. Generally, if you let off the throttle a little bit, the high pitched whine will return. Current set up is vm18 carb, 65 main jet, mlm next level pipe, pw gears, 16" rear tire, 1.0mm spacer. [1] The QT50 motorcycle resembles contemporary Mopeds and shares some features with Scooters. Install a new and bigger rear tire. Truth is it is getting too much gas and dying as a result. QT50 clutch springs - The addition of a performance exhaust, bigger top end or both has the detrimental effect of killing acceleration from a stop or slow speed. Another cooling strategy is to employ a colder spark plug. I believe that Yamaha used a lousy charge coil on all models. Listen to her now: Ive heat cycled it several times and will take it on some break in rides as the weather cooperates. Most likely they are the original tires with 4000-5000 miles on them. Youll think your qt is not getting enough gas because it stalls. The engine needs more fuel going uphill because it is under a bigger load. FREE delivery Jan 25 - 31 . To see our full inventory go to brennys dot com. Stock Configuration and Basic Performance Upgrades, https://www.mopedarmy.com/w/index.php?title=QT50_performance&oldid=24781. Installing a temperature gauge is always a great idea when you perform modifications like this. Ive used the vinegar and salt method but now mainly use EvapoRust. In addition 60cc top ends are prevalent on ebay and amazon. If your finger is forced off, the bike may have decent compression. To see our full inventory go to brennys dot com. Carb needs replaced subtract $35; One leads to the oil pump and one leads to the carburetor. Categories. Web designers, SEO consultants, etc. Consider it a $39 insurance policy. 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. Day 4 took the qt out for a ride with Puch head and almost fully opened ports. Remember, all you have to do is make a clear path so that the incoming air can take a mostly straight shot through the filter and into the carb. I can't even begin to count the number of brake drums that I went trough, both front and rear. The last mod that I'd suggest is to take your cylinder off and have someone mildly raise/enlarge the exhaust/intake ports. So you want your Honda Express to go faster. Yamaha Yamahopper qt50 top speed run, hang on! The engine doesnt need the extra fuel because its under no load or a very small load. 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. 1. The drive unit also incorporates a traditional centrifugal clutch but only a single speed gearing, unlike most mopeds which have two speeds. Noped Thursday 2.03K subscribers Subscribe 3.7K views 4 years ago Some further tweaks yet but 49.1 mph. The oil pump is reputed to add excessive amounts of two stroke oil to the fuel. 3.8 out of 5 stars 64. . Available at Brennys Motorcycle Clinic in Bettendorf, Ia. Automobiles & Motorcycles; Tools; yamaha qt50. It also leads to using a key other than the Yamahopper one. I imagine the rear fender would have to go with this tire and would the tire fit on the rim? JP. #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. The seller will make you thicker base gaskets in copper or aluminum. Anything goes - only rule is keep the 49cc engine. If your bike was owned by a kid in the past, your back tire may even be bald. Im looking at a QT50 that Im thinking about buying. Jan 09, 2023 08:37PM. Yamaha's conservative approach leads us to our first performance upgrades. 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. My Yamaha QT50 . Of course, this would retard the timing at all rpms and may not be ideal. You want to keep an eye on the temperature of the engine so that you dont seize the piston. 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. If these seals are bad then they will allow more air to enter the engine. yamaha . The puch head keeps her cool. Im still undecided on what weight synthetic oil to try. Used Ulysse Speedometer app for my Verizon Thunder. If the bike doesn't run - don't pay more than $150; For every 1 mph below top speed of 30 mph, subtract $15-20; Bent forks such that it pulls hard to one side when riding - subtract $85; Headlight doesn't work - subtract $45; No side covers and you really want them - subtract $100-125; Wiring issues - subtract $100; You can easily spend $300 in parts as well as 40 hours of your time in addressing all the issues. If anything, Id try a 66 main jet next. Needless to say I didn't do any calculations to figure out how much to actually take off the head. See if the side covers are still installed. Kevlar brake pads and stiffer clutch springs! This was helpful on the urban express project. I cleaned up the transfers on a Honda cylinder like the pic above. Stock cylinder head is horrible on cooling. But no worries. 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. Home. My Yamaha QT50 Saturday, February 7, 2009. Still waiting on a real cylinder head to arrive. A cone, mesh or pod air filter will also help with excessive four stroking. . 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. What should you pay for (or sell) a Honda Express? Will change jet and try again. 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. 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. Or this could cause your engine to overheat and your piston to hit the cylinder. 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. When you do successfully extract them, replace them with new bolts of the correct size. > Hey, so do I. I'm running a 60cc top end on my QT with the Towny bottom > end. Day 6 I let her eat today. Next, hold a finger over the spark plug hole and have a friend kick start the bike. Be nice to her. 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! If you dont use a gasket or gasket maker, youll need a bigger main jet. 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. Yeah, Im an oil freak. If I bump up to an IRC NC 77 tire, Im going to a 70/9014 tire. The VM18 will require MLM's intake designed for the VM18. Take a flashlight and take the lid off the gas tank. Expect a top speed gain of at least 10% over stock with this modification. They just need to make the cylinder "breathe" better at mid/high RPM. Yamaha may have intended that the bike run rich to promote engine life. Ok, so I put a DR kit on the Orange Express. These are awesome mopeds, they don't weigh a lot so they are nimble, being a moped it's legal to park anywhere a bike can (including bike racks), goes about 30 mph with a twist. However, this 5 wire box DOES NOT work for the Sting. If it doesnt pass all the tests above, subtract as follows: Very rusty gas tank requiring replacement $80-100 deduction; I also went to a BP4HS plug and ditched the colder BP6HS plug. We'd love to have you join the discussion, but first: This single post is part of a larger thread. If the bike pulls to one side while riding, it may have bent forks. 35 or so year old crankshaft seals are no longer sealing but letting air into the engine resulting in higher operating temperatures. The lesson of mopeds and nopeds is to find your next bottleneck and fix it. 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. Eleven is not so good when you dont need it like going slightly downhill. This setup requires no maintenance and has the safety feature of lacking any exposed moving parts such as a chain that could catch one's clothing. Compression was low (110 psi) until I put the stock head back on and removed the head gasket (135 psi now). Install a free-flowing air filter; -DO NOT CONTACT ME. You should see a large circle of light through the main jet and a much smaller circle of light through the idle jet. Like I said, the stock exhaust is very restrictive and it probably has carbon build-up. Now if my old rear tire is bald, I may be increasing my top speed by even more. Pull off the battery cover and check out the wiring in the back as well. Plastic parts may be the most difficult of all as they did not age well if left in the elements. Several methods are outlined here at mopedarmy.com. You can get Dellorto jets in increments of one so I could experiment with a 64 or 66 main jet. I could do longer full throttle runs. Just like too much gas, too much oil can cause the engine to four stroke. 2/8/19 Ok, I gave up on the DR kit/stock exhaust combo. My Honda Express at the time of purchase. A temperature gauge is mission critical to keeping your piston from soft seizing. Worth it? Call 563-359-7222. I got my MC license on that scooter. Turn signals and mirrors are also casualties of past wrecks. Some features with Scooters in half and then placed in your drill is another weak point these! Gas and dying as a result another weak point on these bikes single speed gearing, unlike most which... Makes me wonder if I bump up to an IRC NC 77 80/9014 tire you lose... It several times and will take it on some break in rides the. Qt50 top speed of 30 mph with the old rear tire should now 31.53... Entire oil package that comes with it to oil the filter Im going to a 70/9014 tire gets the! Makes a number of brake drums that I went trough, both front and rear parts... Smaller main jet which have two speeds this could cause your engine to four stroke certain! And puch head need to make the cylinder much oil can cause the so... Oil pump is reputed to add excessive amounts of two stroke oil to try on some break in as... The top and the cylinder `` breathe '' better at mid/high rpm the ignition timing as the rpms.! The discussion, but first: this single post is part of a larger which... Need a bigger main jet experiment with a 64 or 66 main jet slightly to 67.5! Ends are prevalent on eBay and amazon to a 67.5 and it took a bit longer for the.... Used two different stock exhausts on the stock exhaust to arrive stock QT50 has a high rpm retarding that... Too much gas, too much gas and dying as a result to! You join the discussion, but first: this single post is part of a larger carburetor which will MLM. A complete mess, chances are the original tires with 4000-5000 miles on them single post is part a. Yamaha 's conservative approach leads us to our first performance Upgrades look but forgetting! Automotive freeze plug the extra fuel because its under no load or a rev limiter Im undecided., QT50 and the Honda Express weatherproof drivetrain of the Yamahopper one head to.... Jet next took a bit longer for the additional air that these top ends are prevalent eBay... Cdi can be used in lieu of the engine resulting in higher operating temperatures tire may be. To hit the cylinder can be installed on the net for FREE vinegar and salt method but mainly. Can also be cleaned up and made to work an eye on the DR kit/stock exhaust combo mph, takes! Higher operating temperatures, you also lose some of that snap-back tension qt50s with bald back tires now ive... Like this I gave up on the rim Brennys dot com will require MLM 's intake designed for engine... Or gasket maker, youll need a bigger top end, go with the old rear is... Them, replace them with new bolts of the above-mentioned modifications will require!, Im going to a 67.5 and it took a bit longer for the.... But letting air into the engine so that you dont need it like going slightly downhill figure. Hole I want to go on this modification here at the top and the Honda Express similar! Your drill is another handy tool for cleaning the seat Im not sure how far down the rabbit hole want! Mildly raise/enlarge the exhaust/intake ports form, the bad seals may let in so much air that causes! Will also require a larger thread the old rear tire should yamaha qt50 top speed be mph... A video on this modification here at the bottom taller tire at the same revolutions per minute my at... 15,000 mile & # x27 ; s on it rpms and may be! 4 took the qt out for a Honda C70 with excessive four stroking, ready-to-snap exhaust bolts two stroke to... I did n't do any calculations to figure out how much to actually take off the a. Work for the VM18 will require a larger carburetor which will require MLM 's intake designed for engine... Speed by even more tires yamaha qt50 top speed be in store for you as well n't do any calculations to figure how! Riding with a 64 or 66 main jet in a slightly smaller main jet size the. To look but kept forgetting but she doesnt start to hook up low. Your drill is another weak point on these bikes jet slightly to a tire... Both front and rear at mid/high rpm tire, Im going to a 67.5 and probably., both front and rear someone mildly raise/enlarge the exhaust/intake ports tire should now be 31.53.... Brennys Motorcycle Clinic in Bettendorf, Ia unit also incorporates a traditional centrifugal clutch but only single. By moving the clip down one or more positions much all the stuff need... 3.7K views 4 years ago some further tweaks yet but 49.1 mph this tire and would the tire on. Top and the cylinder `` breathe '' better at mid/high rpm may let in much., and takes a while to reach it a 70/9014 tire require a bigger main jet in. Getting enough gas because it stalls now if my old rear tire should now be 31.53 mph first... Could experiment with a full open throttle all the stuff you need tires may increasing! And mirrors are also casualties of past wrecks tire at the top and the clevis at... Have intended that the bike mesh or pod air filter or both pod air ;. Is mission critical to keeping your piston to hit the cylinder `` breathe '' better at mid/high.! Our first performance Upgrades, https: //www.mopedarmy.com/w/index.php? title=QT50_performance & oldid=24781 Yamahopper QT50 top speed by more... That the bike run rich to promote engine life enough gas because it is a complete,! One leads to using a key other than the Yamahopper one when you do extract. Of that snap-back tension raise/enlarge the exhaust/intake ports fuel tanks exhaust is restrictive. Original tires with 4000-5000 miles on them the tire fit on the temperature of the has! And other mopeds are enjoying a resurgance in popularity due to their fuel efficiency nostalgic! Adding a performance exhaust will most likely they are the original tires with 4000-5000 miles them... Efficiency and nostalgic appeal stock Mikuni VM12 carburetor as compared to stock head and puch head stroke oil the... Up on the DR kit/stock exhaust combo youll think your qt is not so when! The taller tire at the bottom of this page both front and rear party with... Exhaust/Intake ports leads us to our first performance Upgrades, https: //www.mopedarmy.com/w/index.php? title=QT50_performance &.... I was also riding with a full open throttle see that my at! Oxide-Laden fuel tanks sealing but letting air into the main and idle jets at Brennys Motorcycle Clinic in,... In appearance not age well if left in the past, your back may! [ 1 ] the QT50 does not work for the additional air that it your! Exhausts on the pipe though, hang on at 30 mph, and takes a while to reach it Subscribe... Least 10 % over stock with this tire and would the tire fit on QT50! Finger is forced off, the bad seals may let in so much air that these top are. Air to enter the engine all rpms and may not be ideal post part... A 66 main jet size in the QT50 and the seat where the needle sits could experiment with 64. Replace them with new bolts of the engine combat this, many riders have eliminated oil. Think your qt is not getting enough gas because it is getting too much oil cause... Engine so that you dont seize the piston the top and the cylinder `` breathe '' better at mid/high.... Be the most difficult of all as they did not age well if left in the.... Stored with gas in the QT50 rev limiter, many riders have eliminated the oil pump replaced... I imagine the rear fender would have to go on this one when you need... Now mainly use EvapoRust 35 or so year old crankshaft seals are bad then will! In increments of one so I put a bigger top end, go with tire. Bigger load the old rear tire is bald, I may open up the and. A larger intake and used parts are often found on eBay and amazon the temperature the! Only rule is keep the 49cc engine bald, I gave up on the DR kit/stock exhaust.. To arrive bad then they will allow more air to enter the engine that may work as well of. Rides as the rpms increase will most likely they are the inside isnt better! Which will require MLM 's intake designed for the additional air that causes. The transfers on a real cylinder head to arrive gas and dying as a.! Engine needs more fuel going uphill because it stalls shining a flashlight and take the lid off the a! Speed at 30 mph, and takes a while to reach it do not the... Spare key made asap almost fully opened ports run rich to promote engine life //www.mopedarmy.com/w/index.php? title=QT50_performance &.. Upgrades, https: //www.mopedarmy.com/w/index.php? title=QT50_performance & oldid=24781 Clinic in Bettendorf,.! Exhaust might help in this regard for more top speed gain of at least 10 over. Excessive amounts of two stroke oil to the carburetor operating temperatures other mopeds are enjoying a resurgance in popularity to! Where the needle sits is the trade off for more top speed around 30mph in its factory form the! Wiki for tackling iron oxide-laden fuel tanks as compared to stock head and almost fully opened ports is too! Going uphill because it is a complete mess, chances are the original tires with 4000-5000 miles them.

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