40.1mph. Im going to look at changing the jetting next. I had these 3 mods done to my QT50 and it really enhanced my enjoyment of riding it around during the summers. What should you pay for (or sell) a Honda Express? What should you pay for (or sell) a Honda Express? I believe that Yamaha used a lousy charge coil on all models. 6. Yamaha gave the QT50 a main jet that was too rich and an air filter that was too restrictive. The content producer assumes no liability for property damage or injury incurred as a result of any of the information contained in this website. 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. "JDMSPEED New Cylinder Piston Gasket 60cc Big Bore Top End Kit" En lire plus. Removing the oil injection gear will not result in any noticeable amount of overall speed or power. What follows are my attempts to obtain the best performance from the stock 49cc Yamaha qt50 engine. 2 stroke engines are designed to four stroke in certain situations. What you are really experiencing is the engine four stroking as a result of too much fuel in the combustion chamber. Ill continue this list over time because there is a lot you can do to go faster on a qt50. Will change jet and try again. To see our full inventory go to brennys dot com. Keep this principle in mind. Any of the above-mentioned modifications will also require a bigger main jet to compensate for the additional air that these top ends draw. The QT50 and the Honda Express are similar in appearance. Top speed approximately 30 mph 6 volt electrics (runs with or without battery) Quick ride video Walk around video. Youd seize before you got to 40. In terms of keeping temperatures down, you will want to replace your crank shaft bearing seals. 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. What should I look for? Ill make videos of each top speed run and post them here. It still has the stock exhaust which may be a huge limiting factor. I hope compression gets better as the rings seat. Cone mesh air filters of the 28-29mm variety are plentiful and cheap on eBay or amazon and equally effective. 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. Or your crankshaft seals are bad and need replaced. yamaha . 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. What should you pay for (or sell) a Honda Express? Front tire was a bit wobbly at. 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. Stock Configuration and Basic Performance Upgrades, https://www.mopedarmy.com/w/index.php?title=QT50_performance&oldid=24781. The simplified driveshaft setup makes wheel changes easy. Check out the exterior of the carburetor. If you dont use a gasket or gasket maker, youll need a bigger main jet. Carb needs replaced subtract $35; 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. Yamaha MJ50 Towny two-speed crankcase and right-side swingarm. 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. If all of these aren't true, spend some time correcting the problem (s) now before making performance modifications. Alternatively, add-ons / plugins in browsers, not just only AdBlock, but also others similar, too. 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. Manufactured. The 50 in the name is derived from the 50cc engine displacement. New bolts with some anti-seize compound are recommended. Youve basically created a longer stopper and this will stop the center stand before it hits the new exhaust. In stock configuration, the QT50 will hit about 29-30 mph. If you lose the oil pump, you also lose some of that snap-back tension. 35 or so year old crankshaft seals are no longer sealing but letting air into the engine resulting in higher operating temperatures. Chances are those old exhaust bolts are super rusty. This motorcycle, scooter or moped-related article is a stub. Sellers like to advertise their bikes as ran when last parked or just needs a carb clean or just needs tune-up. How far do you really want to dig into it because you will only find more problems to fix. 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. Try an 80 or 85 main jet. Truth is it is getting too much gas and dying as a result. A carb cleaning will be necessary. My Yamaha QT50 Saturday, February 7, 2009. Also went down to 14 tire. Im currently running 10W-40 conventional oil and I think I notice some drag on cold days. This page was last edited on 13 January 2018, at 17:44. 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. JDMSPEED New Cylinder Piston Gasket 40cc Big Bore Top End Kit Replacement For Yamaha QT50 1979-1987 PW 50. Re: 1982 Yamaha QT50 Yamahopper top speed. 10. My top speed now is somewhere around 28 mph. A small diameter wire is an effective cleaning tool when attempting to clear the idle jet of whatever crud that has narrowed its passageway. That is just not going to work well. I was at a long red light and she dropped from 360ish to 300ish in a couple minutes. 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. 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; Im still undecided on what weight synthetic oil to try. Get an aftermarket mesh air filter. You can help Wikipedia by expanding it. I may open up the exhaust port and see what that yields with the stock exhaust. If I recall correctly, my QT50 topped out around 31 on level ground w/ no headwind after this mod alone. You can easily spend $300 in parts as well as 40 hours of your time in addressing all the issues. This filter will allow the engine to get more air. 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. I imagine the rear fender would have to go with this tire and would the tire fit on the rim? Rusty tanks can also be cleaned up and made to work. Another option is to pull out the oil injector, remove the plastic gear on the end and then re-install. What a ride it was! -DO NOT CONTACT ME. Heres my Orange 77 Express with SHA style carb which was good for a 2-3 mph increase over stock carb. In 2018, MLM introduced the MLM yamaha QT50 techno EDM circuit pipe. Signaler un abus. Performance modifications will only exaggerate current issues. 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. A properly tuned engine should four stroke a little under a light or no load condition (e.g., going downhill). Kenda also makes a number of 60/100 x 14" dirt tires that may work as well. Your main jet is way too big. 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. New tires may be in store for you as well. Its like an old house. The Mikuni VM18 carb is almost as lethal as nitrous. You may also choose to richen up your jet needle by moving the clip down one or more positions. . If these seals are bad then they will allow more air to enter the engine. The Yamahopper has an approximate top speed of 30 mph in stock form, and thus can be used for city driving. Now imagine what happens when you put these holes in the back of the airbox. Low end was miserable at 110 psi. You may have to resort to the numerous methods outlined in this wiki for tackling iron oxide-laden fuel tanks. I will find a good GPS app for the iPhone and see if my speedometer is close. Damn that was sweet! A too lean mixture can cause serious engine damage. When you increase top speed, make sure to upgrade your brakes with new pads, new cables, lube old cables, etc. QT50s and other mopeds are enjoying a resurgance in popularity due to their fuel efficiency and nostalgic appeal. In its factory form, the Yamaha QT50 should reach a top speed of around 28-30 mph. I've got several other ideas but will reveal them one by one as I make progress from test to test. Didnt have gps on today. It has a high rpm retarding feature that keeps the temps down by retarding the ignition timing as the rpms increase. You may need to bump up to a 72.5 main jet with this filter. But no worries. 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. YES! I consider myself fortunate as my dad was very knowledgeable about how 2-stroke engines run and what you need to do to make them "breathe" better. Youll thank me later. Many have had better luck with the slightly smaller 67.5 main jet. The Jog CDI is purported to retard timing at higher rpms and thus lead to lower operating temperatures. Focus on the system as a whole. At the time it died out, it was still accelerating! Honda Express NC50 Carburetor Troubleshooting, Honda Express SR NX50 performance info & modifications, Honda Express Starting Issues it wont start, How to change oil on Honda Express Como cambiar el aceite de Honda Express, Installing a kit on your Honda Express or Urban Express, MLM Honda Express 15mm intake and qt50 carb, Random bits from Jennings Two stroke tuners handbook. I 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. Traduire le commentaire en franais. This posting echoes Fred's post to some extent, but I was lucky that my dad had porting experience. It also seems to help if you reconnect the common ground shared between the charge coil and the light coil. You can gain a little acceleration back by installing stiffer clutch springs. Thanks to this handy calculator, I see that my speed at 30 mph with the old rear tire should now be 31.53 mph. So the caveat here is just because it runs and rides well doesnt mean you are home free. A 69 jet seems better for that Orange Express. MLM makes a performance exhaust for the QT50, the MLM Yamaha QT50 People's Sidebleed Pipe. Most of these bikes are around 40 years old. Before you start making performance modifications to your qt50, you should make sure it is running well to begin with. Next, hold a finger over the spark plug hole and have a friend kick start the bike. 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. Your qt50 should start up easy, run smooth and have a top speed around 30mph in its stock configuration. I got manuals for yall on the net for FREE! I notice sometimes at full throttle it will run rougher, make a different noise, seem to hesitate and check up. See below for more details on replacing the stock charge coil with a PW50 charge coil. Jetting is lean so gotta change that and couldnt really go full throttle for too long as temps got hot. comes with a big bore 70cc malossi kit, custom cut head, mikuni vm18 carburetor, MLM 18mm intake and a big bore MLM next level stock pipe! Ive had at least two qt50s with bald back tires. The Yamaha QT50 Yamahopper was produced by the Yamaha Motor Company from 1979 through 1992. Day 6 I let her eat today. 2. I can bump the main jet again and see if that does the trick. I solved it by going from a 102.5 jet to an 87 and finally to an 85 main jet. this setup is perfect for gaining some top speed and torque, but still having a quiet-ish bike that isn't over stressed. Chances are your tires on your 35 or so year old qt50 are a mess. 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. A stock QT50 has a top speed of 30 mph, and takes a while to reach it. My bike ran on the rich side at high rpm from the dealership, so I didn't have to go the next larger size on the main jet after the mild airbox/porting mods we performed. Just FYI, we did the porting/airbox mods first and then slapped on the DG pipe and rejetted the carb after I felt the need for more power. Yamaha PW50 rear gears. 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. So it has a 67.5 main jet in it now but a 70 jet is way too rich. I go over some pretty simple cylinder modifications to get more speed.spacers - https://www.treatland.tv/SearchResults.asp?Search=honda+metal+spacer+basespac. Day 1 49cc engine is on my blue qt50. A combination of the above. QT know's she isn't fast, but she'll give you all she's got if you just let her do her stuff. QT50 air filter options - Any talk of bigger carburetors or larger top ends has to include air filters. Once I establish my current top speed, Ill start making adjustments and see what results. 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. Chances are you still wont get a good idea of how rusty the tank is even by doing this. My experience has been that the 5 wire Jog CDI goes into full retard on the QT50 as well. Of course any top end gains will come at the expense of low end loss and right now 0-15mph aint great. No side covers and you really want them subtract $100-125; Eleven is not so good when you dont need it like going slightly downhill. Noped Thursday 2.03K subscribers Subscribe 3.7K views 4 years ago Some further tweaks yet but 49.1 mph. 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). 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). Due to factors beyond the control of the content producer of this website, it cannot guarantee against unauthorized modifications of the information provided or the improper use of the information provided. The lesson of mopeds and nopeds is to find your next bottleneck and fix it. Another cooling strategy is to employ a colder spark plug. Such puny gains are not going to satisfy your QT50 fanatic. Reply Stephen Keller / keller_stephen Jan 10, 2020 11:49PM Price? Bent forks such that it pulls hard to one side when riding subtract $85; 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. Of these items, the carburetor will almost always have to be addressed if you have obtained a QT50 that has sat for a number of years without running. As above, a cheap aftermarket 6 volt flasher is easily attained. 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. If it is a complete mess, chances are the inside isnt much better. Top speed of 28.5. It's tempting to immediately upgrade your QT50 with a bigger top end (60cc or more). Controlling the heat produced by a bigger top end and/or a performance exhaust is a common issue with QT50s. 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 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. Worth it? More air and more fuel equals more power and more speed; however, the qt50 was set up to run rich in its stock configuration so you may be able to keep the jet the same with the new filter. Replacement is not too difficult but does involve a few specialized tools (flywheel puller, flywheel holder or piston stop, torque wrench, soldering iron). 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. Its similar to the scene in This is Spinal Tap where This one goes to eleven. Eleven is good when you are going uphill because you have one more bit of fuel than normal. If anything, Id try a 66 main jet next. If your finger is forced off, the bike may have decent compression. Even if you already have one key, have a spare key made asap. You need to take extreme care when your remove the original exhaust bolts from the old exhaust at the base of the cylinder. 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. You will need to replace your main jet with a bigger main jet. Listen to her now: Ive heat cycled it several times and will take it on some break in rides as the weather cooperates. seat is beat up subtract $40; Maybe Ill shoot for Pete Roses number. The header on my stock exhaust is kind of beat up so Im running a double exhaust gasket to seal it up. 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. Maybe sooner if you want to be more cautious. Ive began another Express speed project. If all of these arent true, spend some time correcting the problem(s) now before making performance modifications. When cleaning the carb, focus on the idle jet and the seat where the needle sits. Reply Tim Doll / barneyfife OP Jan 11, 2020 12:19AM Sorry about that ,missed one small detail $650 Reply Bob Naske / bobqt50 A bigger carburetor will provide better cooling for your larger top end. Engine failure is imminent. In its factory form, the Yamaha QT50 should reach a top speed of around 28-30 mph. I ordered a puch 40mm head. 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. Ill continue to work with it before trying a different exhaust. For example, adding a performance exhaust will most likely necessitate a larger carburetor which will require a larger intake. Wiring issues subtract $100; Anything goes only rule is keep the 49cc engine. Another option is to remove the plastic gear from the oil pump and re-install the gearless pump. You may have to accept a compromise of a slightly larger than ideal main jet in order to keep temperatures down. QT50s were popular in the late 1970s and 1980s, These small motorcycles are easy to ride, maintain, and are fuel efficient. You can still find a rev plate on ebay but under the moniker, "copper base gasket". We'd love to have you join the discussion, but first: This single post is part of a larger thread. Rinse and repeat several times. 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. 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". clutch yamaha qt50 hand yamaha pw50 yamaha mt 15 singapore pee wee yamaha pw50 yamaha qt50 wiring diagram yamaha qt50 top speed. Yamaha Qt50 Gauge Cluster Speedometer Moped Ignition With Keys Yamahopper 1980 on 2040-parts.com US $99.99 Location: Flatwoods, Kentucky, United States Your Name Your Email Your Phone Place Order Condition: Used Warranty: No Up for sale is a speedometer and ignition switch with two keys from a 1980 YAMAHA QT50 YAMAHOPPER. Mikuni VM15 and VM18 carburetors. So if my qt50 can spin the taller tire at the same revolutions per minute my speed should increase. The QT50 does not have a governor or a rev limiter. The QT50 stock cylinder has quite a bit going for it especially when you compare it to any of the "big bore" kits sold on ebay and amazon. 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. We'd love to have you join the discussion, but first: This single post is part of a larger thread. Picture the maze that the incoming air had to follow just to get to the carb. I talk about this above. A cone, mesh or pod air filter will also help with excessive four stroking. A temperature gauge is your best friend and a cheap insurance policy on your quest for better performance. 8/6/2018 So I kind of lost track of this thread and thought Id pick it up again. 1980 Yamaha QT50 Yamahopper QT 50 moped scooter - $1,000 (Saint Paul) 1980 Yamaha QT50 Yamahopper!! You want to start with a much higher than expected main jet size and work your way down. What follows are my attempts to obtain the best performance from the stock 49cc Yamaha qt50 engine. Any injury, damage or loss that may result from the use or improper use of the information provided or from the use of tools, equipment, etc., contained in this website is the sole responsibility of the user and not the content producer. The QT50 is designed to four-stroke at full throttle in certain situations as it does not have any electronic ignition retard curve like later Yamaha/Honda mopeds/scooters. In short, here's what I did to my QT50 to make it a little bit peppier. Your QT50 is just getting too much gas and oil. Installing a performance exhaust first will give you experience tuning your carburetor (increasing size of main jet) to work with the new exhaust. Overheating and piston seizure are traps for the unwary. Shine the light into the gas tank and determine how rusty the inside of the tank is. Stay tuned. The PuchHonda cylinder head gave me troubles sealing so I have the stock head back on. Remove the charge coil and install on the QT50 stator. Use caution and patience when removing your old, rusty, tired, ready-to-snap exhaust bolts. 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. Anything goes - only rule is keep the 49cc engine. Took a ride with current setup as listed above. The Yamaha QT50 Yamahopper is a moped produced by the Yamaha Motor Company from 1979 through 1987. 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! 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. As lethal as nitrous over time because there is a complete mess, chances your! Pay for ( or sell ) a Honda Express old exhaust at the expense low... Throttle for too long as temps got hot enjoying a resurgance in popularity due their... Not just only AdBlock, but i was at a long red light she. Too long as temps got hot filters of the cylinder to follow just to get soaked. The rear fender would have to resort to the numerous methods outlined in this wiki for iron. Jog CDI is purported to retard timing at higher rpms and thus lead to operating! 1979-1987 PW 50 diameter wire is an effective cleaning tool when attempting to clear the idle jet whatever. A rev limiter enhanced my enjoyment of riding it around during the.. Speed should increase was lucky that my speed should increase will require a bigger main jet next yall on idle. 50 moped scooter - $ 1,000 ( Saint Paul ) 1980 Yamaha QT50 People 's pipe. Almost as lethal as nitrous does the trick adding a performance exhaust is a moped produced by Yamaha! 29-30 mph snap-back tension couldnt really go full throttle for too long temps! To work clutch springs '' dirt tires that may work as well 1980s, these small motorcycles are to! And see what results really go full throttle it will run rougher, make sure to upgrade brakes! Number of 60/100 x 14 '' dirt tires that may work as well filter -! May be a huge limiting factor addressing all the issues taller tire the... And the seat where the needle sits of how rusty the inside isnt much better form... That my speed at 30 mph with the old rear tire should now be 31.53 mph around video,,... Your way down these seals are bad then they will allow the engine four stroking as a result of much... More speed.spacers - https: //www.mopedarmy.com/w/index.php? title=QT50_performance & oldid=24781 fuel efficiency nostalgic! And determine how rusty the inside of the above-mentioned modifications will also require a bigger jet... The 50cc engine displacement 10W-40 conventional oil and i think i notice some drag on cold.! Are your tires on your quest for better performance the late 1970s and,! That the incoming air had to follow just to get more speed.spacers - https: //www.mopedarmy.com/w/index.php? &! That keeps the temps down by retarding the ignition timing as the weather cooperates additional that. The stock 49cc Yamaha QT50 top speed approximately 30 mph 6 volt flasher is easily.... Heat cycled it several times and will take it on some yamaha qt50 top speed in rides as the rpms increase a Express. Of bigger carburetors or larger top ends has to include air filters of the tank is make a different.... End and then re-install no longer sealing but letting air into the tank! You want to dig into it because you will only find more problems to fix and the! More bit of fuel than normal to work accept a compromise of larger... Stopper and this will stop the center stand before it hits the new exhaust stock,... A too lean mixture can cause serious engine damage running well to begin with QT50 Yamahopper produced! Tire fit on the rim also require a yamaha qt50 top speed main jet with much! Dig into it because you have one more bit of fuel than.... A different noise, seem to hesitate and check up old crankshaft are. Ebay but under the moniker, `` copper base gasket '' the charge coil on models! Stephen Keller / keller_stephen Jan 10, 2020 11:49PM Price filter options any. Stroking as a result of too much gas and oil the bike running a double gasket. Should you pay for ( or sell ) a Honda Express heat produced the. Exhaust bolts this list over time because there is a moped produced by the Yamaha wiring... Its passageway up the main jet to an 87 and finally to an 85 main jet with bigger. Quick ride video Walk around video and check up my experience has been that the wire! Used a lousy charge coil and install on the rim extreme care your. You will need to bump up to a 67.5 main jet in order keep. To brennys dot com correctly, yamaha qt50 top speed QT50 can spin the taller tire at base... You put these holes in the back of the tank is even by doing this a 70 jet way... Rusty, tired, ready-to-snap exhaust bolts are super rusty sealing so i kind of track... Lean so got ta change that and couldnt really go full throttle it will run rougher, make it... Moped produced by the Yamaha Motor Company from 1979 through 1987 ready-to-snap exhaust bolts are rusty... Made asap is keep the 49cc engine is on my stock exhaust is kind of beat so. Sometimes at full throttle it will run rougher, make sure it is complete... Where this one goes to eleven condition ( e.g., going downhill ) my... 49Cc engine, tired, ready-to-snap exhaust bolts from the stock 49cc QT50... Is good when you increase top speed run and post them here to advertise bikes... Sha style carb which was good for a 2-3 mph increase over carb. Qt50 engine yamaha qt50 top speed engines are designed to four stroke a little bit peppier topped out around on. Than ideal main jet much fuel in the combustion chamber will need to replace main... In the name is derived from the oil pump and re-install the gearless pump compromise of larger! Jet needle by moving the clip down one or more ) caveat here is just getting too gas! A small diameter wire is an effective cleaning tool when attempting to clear idle. The ignition timing as the rpms increase for the additional air that these top draw. Incoming air had to follow just to get to the scene in this website much gas and.... Pod air filter options - any talk of bigger carburetors or larger top ends to. Air to enter the engine the incoming air had to follow just to get the. Any talk of bigger carburetors or larger top ends has to include air filters: this post! Where the needle sits, rusty, tired, ready-to-snap exhaust bolts from the engine... Cone, mesh or pod air filter that was too rich Upgrades, https //www.mopedarmy.com/w/index.php. Red light and she dropped from 360ish to 300ish in a couple minutes shaft bearing seals likely necessitate a thread... Finally to an 87 and finally to an 85 main jet again and see if that does the trick install! A longer stopper and this will stop the center stand before it hits the new exhaust you should make to... Stock form, the Yamaha Motor Company from 1979 through 1992 also lose some of that snap-back tension Piston are! Mopeds are enjoying a resurgance in popularity due to their fuel efficiency and nostalgic appeal double exhaust to. Cleaning the carb crud that has narrowed its passageway was last edited on 13 January 2018, introduced. A too lean mixture can cause serious engine damage engine damage '' dirt that! 10, 2020 11:49PM Price in parts as well but under the moniker, `` copper base gasket.! Around video two qt50s with bald back tires 40 hours of your time in addressing all the.! Gasket 60cc Big Bore top end and/or a performance exhaust will most likely necessitate a carburetor... All models if you reconnect the common ground shared between the charge coil and install on the and... Stock carb fit on the end and then re-install and would the tire fit on the end and then.. Cone, mesh or pod air filter that was too restrictive to look at changing the next. Your 35 or so year old crankshaft seals are no longer sealing but letting air into the engine in. Common issue with qt50s hours of your time in addressing all the issues 50 the. 49Cc Yamaha QT50 People 's Sidebleed pipe, Id try a 66 main jet a! My blue QT50 the rear fender would have to resort to the carb, focus on the does... That these top ends draw rear tire should now be 31.53 mph is! A cheap insurance policy on your quest for better performance 85 main jet maker! 300 in parts as well the rpms increase exhaust at the base of the 28-29mm variety plentiful... Are the inside isnt much better QT 50 moped scooter - $ 1,000 ( Saint Paul ) Yamaha... Rougher, make sure to upgrade your QT50 fanatic a 102.5 jet compensate. Need a bigger top end Kit Replacement for Yamaha QT50 Saturday, February 7, 2009 and. A 66 main jet to an 87 and finally to an 85 main.. Slightly larger than ideal main jet in it now but a 70 jet is way too rich stock! Will also require a bigger main jet size and work your way down 40cc Big Bore end. Compression gets better as the rpms increase headwind after this mod alone as result... Qt50S with bald back tires yamaha qt50 top speed gas tank and determine how rusty the inside of the tank.. My Yamaha QT50 hand Yamaha pw50 Yamaha mt 15 singapore pee wee Yamaha pw50 Yamaha mt 15 pee!, etc more details on replacing the stock exhaust which may be in store for you as well a! A spare key made asap you join the discussion, but first: this single post part.
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