Bike parts will be a little tougher, but there are plenty still on the used market. Qt50s will sell for less in the fall and winter. Get an aftermarket mesh air filter. This is my yamaha qt-50, its a 49.9cc scooter with a top speed of 32mph. Youll need to increase the size of the main jet when you do this. Right and left side crankshaft seals can be found on ebay or treatland.tv. What should you pay for (or sell) a Honda Express? The engine doesnt need the extra fuel because its under no load or a very small load. Re: I got manuals for yall on the net for FREE. 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. Yeah, Im an oil freak. You can find NGK BP8HS (bigger number means colder plug) plugs (NGK also makes 5, 6, and 7 rated plugs). Ive had at least two qt50s with bald back tires. Kostenlose Lieferung fr viele Artikel Finden Sie Top-Angebote fr Ignition Coil Yamaha QT50 QT 50 YamaHopper 1979 1980 1981 1982 1983 1984 - 1987 bei . You may also choose to richen up your jet needle by moving the clip down one or more positions. A small diameter wire is an effective cleaning tool when attempting to clear the idle jet of whatever crud that has narrowed its passageway. Didnt have gps on today. Will change jet and try again. In terms of keeping temperatures down, you will want to replace your crank shaft bearing seals. What should you pay for (or sell) a Honda Express? Titled and ready to go. 3. Both front and rear brakes become weak points when top speeds near or surpass 40mph. Ive used the vinegar and salt method but now mainly use EvapoRust. 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. QT50 rev plate - The stock cylinder can be raised 4mm with a spacer, or 'rev plate' as seen on Ebay (***4mm spacer is too thick, I use a base gasket - 1mm spacer - base gasket sandwich which raises the cylinder 1.5mm and that should allow the piston to clear the exhaust port fully***). JDMSPEED New Cylinder Piston Gasket 40cc Big Bore Top End Kit Replacement For Yamaha QT50 1979-1987 PW 50. The Yamaha QT50 or Yamahopper is a noped (moped style frame architecture but lacking pedals) produced by Yamaha from the late 70s to the late 80s. Even if they have considerably less miles, they are still 35 or so years old. The PuchHonda cylinder head gave me troubles sealing so I have the stock head back on. Maybe Ill shoot for Pete Roses number. 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. Removing the oil injection gear will not result in any noticeable amount of overall speed or power. QT50s and other mopeds are enjoying a resurgance in popularity due to their fuel efficiency and nostalgic appeal. Half the package or less is plenty. Im still breaking it in and have encountered and overcome several hurdles already. The Yamahopper has an approximate top speed of 30 mph in stock form, and thus can be used for city driving. Popular modifications include: Yamaha YT60 cylinder, piston and rings. Do not use the entire oil package that comes with it to oil the filter. Try a hotter spark plug; What should you pay for (or sell) a Honda Express? I cleaned up the transfers on a Honda cylinder like the pic above. $650 in Ohio may be the same as $900 in California or New York. At the time it died out, it was still accelerating! The bikes all came with turn signals and oil injection making them very modern compared to many of their European counterparts. I had cyclekeysonline make me a $10 key for it and it worked. I talk about this above. 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. Another culprit in QT50 excessive four stroking is the oil pump. Im currently running 10W-40 conventional oil and I think I notice some drag on cold days. Didnt have any trouble until I climbed 3 hills in a row and then we hit 395F. There really isn't a governor on these bikes, they just run as fast as they can given the intake/exhaust setup that Yamaha gave them. No side covers and you really want them subtract $100-125; If the previous owner left gas in the tank and carb before storing the QT50, you will experience the double pleasure of cleaning the carb and gas tank. Another option is to remove the plastic gear from the oil pump and re-install the gearless pump. The QT50 and the Honda Express are similar in appearance. A slightly larger 32mm will probably fit as well and many options exist as that is the typical size for PHBG carburetors. I was reading the service manual for the NC50 and saw that it called for 10W-40 transmission oil in the summer and 5W-30 in the winter. Call 563-359-7222. Prices vary throughout the country. You need one with the eyelet at the top and the clevis end at the bottom. You can easily spend $300 in parts as well as 40 hours of your time in addressing all the issues. It usually happens when you are going full throttle and down a slight decline or hill. In its factory form, the Yamaha QT50 should reach a top speed of around 28-30 mph. Or you can find a hose or fuel line that offers a compromise between the different sizes of the oil injection inlet and outlet ports and connect the two to continuously cycle a small amount of oil through the pump while running premix in the fuel tank. Youd seize before you got to 40. Even if you already have one key, have a spare key made asap. The next easiest thing that you can do is slap on an expansion chanber. I just bought an MLM peoples sidebleed pipe for my QT50/MJ50. Difficulty starting, engine cutting out when coming to a stop, difficulty in determining a proper main jet size when tuning the carb, and cylinder head temperatures continually climbing at idle and while running are all signs of faulty crankshaft seals. Air filter missing subtract $25-35. Mine changes gears . Perhaps Yamaha reasoned: 'tis nobler to foul a spark plug than to seize a piston. The main jet should be your initial focus. Try an 80 or 85 main jet. dead battery subtract $25; 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. When you increase top speed, make sure to upgrade your brakes with new pads, new cables, lube old cables, etc. Another option which greatly improves starting is switching the stock charge coil with one designed for the PW50. 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. Install different clutch springs to get back your low end. Because I opened up the reed block slightly, a 2.5 increase in jet size is significant. 8/6/2018 So I kind of lost track of this thread and thought Id pick it up again. The simplified driveshaft setup makes wheel changes easy. Remplacement pour Yamaha QT50 1979-1987 ; . Consider it a $39 insurance policy. 2. Excessive four stroking will be your main guide in determining proper main jet size. Next, hold a finger over the spark plug hole and have a friend kick start the bike. For Cable Housing. It also leads to using a key other than the Yamahopper one. Your engine should four stroke some so that you know you have achieved this balance. Motion Pro Rubber Sleeve (11-0045) 0 # mpn4565891373. When cleaning the carb, focus on the idle jet and the seat where the needle sits. Almost there. yamaha . A complete PW50 stator can be had for less than $20. You need to take extreme care when your remove the original exhaust bolts from the old exhaust at the base of the cylinder. 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. New tires may be in store for you as well. I imagine the rear fender would have to go with this tire and would the tire fit on the rim? Im still undecided on what weight synthetic oil to try. If I bump up to an IRC NC 77 tire, Im going to a 70/9014 tire. 9. If your finger is forced off, the bike may have decent compression. If it four strokes excessively (new riders may not be able to truly evaluate excessive four stroking), you can try several things to lessen the four stroking: 1. See if the side covers are still installed. This system eases cold starting: when the key is placed in the "start" position, the ignition supplies a stronger than normal spark for initial starting, but does not allow the engine to rev so as to avoid burning the piston. Truth is it is getting too much gas and dying as a result. 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. 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. We are back up and running. Manufactured. Youll think your qt is not getting enough gas because it stalls. 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. 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. 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. All this is necessary to avoid seizing your piston as the performance exhaust will have the effect of leaning out your fuel/air mixture. Install a free-flowing air filter; I have 0W-20, straight 30W synthetic, synthetic transmission fluid. Turn signals and mirrors are also casualties of past wrecks. Worth it? This filter will allow the engine to get more air. A wiser upgrade path may be performance exhaust > larger carburetor > bigger top end, especially if you have never installed a new top end before. A too lean mixture can cause serious engine damage. The K&N RC-2540 Universal Clamp-On Air Filter is a good but expensive choice. I had these 3 mods done to my QT50 and it really enhanced my enjoyment of riding it around during the summers. The oil pump is reputed to add excessive amounts of two stroke oil to the fuel. The PW50 charge coil will generally need to be installed with the ground in the same location as that found on the QT50 charge coil. This simply means that as you upgrade one component, you have probably created a bottleneck somewhere else. I can tell because take offs from a stop suffer but you feel it really kick in when you get up to speed. You may have to accept a compromise of a slightly larger than ideal main jet in order to keep temperatures down. People often screw up the wiring. Do this little by little in combination with PB-Blaster. I treat all these as non-runners. 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. Honda Express with tecno boss exhaust and 1.5mm cylinder spacing. The QT50 does not have a governor or a rev limiter. If it goes slower than this, negotiate accordingly. I got manuals for yall on the net for FREE! Be nice to her. Be mindful of not completely eliminating all four stroking. Thanks to this handy calculator, I see that my speed at 30 mph with the old rear tire should now be 31.53 mph. 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. Available at Brennys Motorcycle Clinic in Bettendorf, Ia. 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). You should see a large circle of light through the main jet and a much smaller circle of light through the idle jet. Puch head arrives Monday. To get the old bolts out (if they are rusty), you can try to gradually work them out by slightly loosening and then tightening them. So if my qt50 can spin the taller tire at the same revolutions per minute my speed should increase. I go over some pretty simple cylinder modifications to get more speed.spacers - https://www.treatland.tv/SearchResults.asp?Search=honda+metal+spacer+basespac. Stock plug is an NGK BP4HS. 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. Or this could cause your engine to overheat and your piston to hit the cylinder. The Mikuni VM18 carb is almost as lethal as nitrous. My Honda Express at the time of purchase. It gets around 100-125 mpg, its really reliable, I use it to drive to campus, you can park it on the bike racks and. Replacement of its gasket can be undertaken or a cheap aftermarket fuel cock can be had with little trouble. A bigger cylinder head would also help with cooling. Install an MLM peoples sidebleed exhaust. 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. This does not mean that all four stroking is bad. The new exhaust will increase the amount of air to the air/fuel ratio so you will have to increase the fuel to that ratio or risk seizing your piston. . Best jetting for VM18 on this setup seems to be 20 idle jet and 80 main jet. Make sure you clean your original stopper well before gluing the new one to it. I can probably jet higher after getting the piston to clear the ports. Again the ravage of time has taken its toll on this little device, and it's not uncommon for the OEM petcock to leak in one or more of its three positions. Used Ulysse Speedometer app for my Verizon Thunder. Ok, so I put a DR kit on the Orange Express. Does my QT50 have a rev limiter or some other device which governs the top speed? 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. Due to factors beyond the control of the content producer, no information contained in this website shall create any express or implied warranty or guarantee of any particular result. I solved it by going from a 102.5 jet to an 87 and finally to an 85 main jet. 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. Add a new exhaust gasket and put a little anti-seize on the new bolts before installing. What a ride it was! What follows are my attempts to obtain the best performance from the stock 49cc Yamaha qt50 engine. 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 other 2 wires are power for lights or battery. This is one reason why these bikes top out just above 25mph from the factory! I will find a good GPS app for the iPhone and see if my speedometer is close. seat is beat up subtract $40; You want to keep an eye on the temperature of the engine so that you dont seize the piston. Also went down to 14 tire. Take a flashlight and take the lid off the gas tank. 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. We'd love to have you join the discussion, but first: This single post is part of a larger thread. Yamaha used two different stock exhausts on the QT50. #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. Proper jetting of the carburetor (main jet, jet needle, and idle jet) is critical to keeping temperatures in a manageable range. Trail Tech offers a 14mm gauge for $39 or so. -DO NOT CONTACT ME. Performance modifications will only exaggerate current issues. So you want your Honda Express to go faster. I'll make videos of each top speed run and post them here. Spring is always the hot season for noped and moped sales. Now my former paperweight had a new lease on life. Stock main jet size in the QT50 is a 70. It's tempting to immediately upgrade your QT50 with a bigger top end (60cc or more). 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". Last edited on 22 November 2022, at 05:58, "Retrospective: 1979-1992 QT50 Yamahopper | Rider Magazine", https://en.wikipedia.org/w/index.php?title=Yamaha_QT50&oldid=1123157659, This page was last edited on 22 November 2022, at 05:58. -DO NOT CONTACT ME. Better a fouled spark plug than a seized piston, right? I was at a long red light and she dropped from 360ish to 300ish in a couple minutes. It's simple, maintenance-free shaft-drive contained in the single-sided swingarm eliminates chain maintenance, safety and wear concerns as well as weather wear factors and contributes to the durability and ease of use of these tiny motorbikes. Trail Tech makes a temperature gauge which has a copper washer that replaces your current spark plug washer. So it has a 67.5 main jet in it now but a 70 jet is way too rich. I was bummin' that my 83 QT50 would bog out at 25mph. Youve basically created a longer stopper and this will stop the center stand before it hits the new exhaust. The Dell'Orto SHA 15.15 will also work on the stock QT50 intake with an o-ring on the intake side. 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. What you are really experiencing is the engine four stroking as a result of too much fuel in the combustion chamber. Day 1 - 49cc engine is on my blue qt50. Kenda also makes a number of 60/100 x 14" dirt tires that may work as well. Well, I hope you and others find my experience useful. So, in essence, it would be getting too little fuel. clutch yamaha qt50 hand yamaha pw50 yamaha mt 15 singapore pee wee yamaha pw50 yamaha qt50 wiring diagram yamaha qt50 top speed. This page was last edited on 13 January 2018, at 17:44. Now the air can flow in from the back of the airbox, straight through the filter and into the carb. 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. Remove the charge coil and install on the QT50 stator. The rear brakes tend to be weak on this bike. Does the owner have title? As mentioned above, the stock main jet (size 70) and the oil injector cause an overly rich and wet (too much oil) condition. Ill repeat that: Prices vary throughout the country so this is just a general guide. Other cooling methods include running a thicker head gasket (or more than one head gasket) to reduce compression (you can also reduce compression by increasing cylinder head chamber size) and running a Jog cdi with a curve that allegedly retards timing at higher rpms. Performance upgrades, as listed above, exist for the QT50 that will make 50 mph~ attainable. Most of the parts for the QT50 are still available from Yamaha dealers. 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. 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! -DO NOT CONTACT ME. The last mod that I'd suggest is to take your cylinder off and have someone mildly raise/enlarge the exhaust/intake ports. ma 50 M Ne completa Junta Conjunto 998030 Yamaha QT50 1979-1987. 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. 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. As above, a cheap aftermarket 6 volt flasher is easily attained. Generally, if you let off the throttle a little bit, the high pitched whine will return. This jailbreaks the relatively generous exhaust port (in the stock configuration, the piston partially covers a portion of the exhaust port at bottom dead center; the rev plate raises the cylinder jug and thus allows the piston to fully expose the exhaust port at bottom dead center). So I can compare temps between stock head and puch head. Is there anything else I need to do before installing/using it? With all this in mind, what should you pay for a Yamaha qt50? A larger carburetor may even be a better choice than the stock carburetor with a larger jet. Picture the maze that the incoming air had to follow just to get to the carb. If the bike pulls to one side while riding, it may have bent forks. Day 5 So I went from 34-35 with next level pipe to 39.7 with circuit pipe. 6. If you lose the oil pump, you also lose some of that snap-back tension. Low end was miserable at 110 psi. 10. Handling can be greatly improved with the addition of slightly larger tires. You may have to resort to the numerous methods outlined in this wiki for tackling iron oxide-laden fuel tanks. I can bump the main jet again and see if that does the trick. 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. Once it gets on the pipe though, hang on! Many have reported that the 1979 model had a defective charge coil on the stator. I put perhaps 15,000 miles on this bike (the plastic speedo/odometer housing in the front hub failed after about 9,000 miles due to these speed mods), and I cannot stress enough of the importance of taking care of your air filter and making sure you keep that oil reservoir full. I got a mid-top end pipe from DG that was made for the QT50. Thats an almost 2 mph increase by just changing the rear tire. Youll thank me later. 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. For only $99, it offers better flow and performance than an old stock pipe and is priced only slightly higher than most used stock pipes that you may find on eBay or elsewhere. Top speed run, super windy and about 69 degrees. Yamaha has tuned the engine to do this in that situation and it represents a compromise. It has a high rpm retarding feature that keeps the temps down by retarding the ignition timing as the rpms increase. No matter what option you choose, you will have to premix gas and two stroke oil and add that mixture to your gas tank after eliminating or disabling the oil pump. 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. This headlight has a replaceable bulb and fits perfectly in the QT50's headlight ring. $44.99 $ 44. 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. What should you pay for (or sell) a Honda Express? The most outstanding feature of this bike would have to be its final drive which consists of a solid drive shaft (with a torsion spring to dampen the engines vibration) that connects the transmission to a ring and pinion gear set in the rear hub. Re: RPM gauge for the Yamaha QT50. In 2018, MLM introduced the MLM yamaha QT50 techno EDM circuit pipe. Or fastest delivery Jan 20 - 24 . It has a 15.15 SHA clone carb and currently running a 75 main jet. Pull off the battery cover and check out the wiring in the back as well. Also check the foot pegs to see if they are bent. Yamaha may have intended that the bike run rich to promote engine life. 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. Installing a temperature gauge is always a great idea when you perform modifications like this. 41.6mph. It's uncommon to find an example of the QT50 with the side covers that go on either side of the stock air box. This part is used to reduce the degree of performance for your motorcycle, for yamaha. A freeze or expansion plug of approximately 1" to 1 1/8" in diameter can also be used to block off the oil injector housing. The seller will make you thicker base gaskets in copper or aluminum. Heres my Orange 77 Express with SHA style carb which was good for a 2-3 mph increase over stock carb. In short, here's what I did to my QT50 to make it a little bit peppier. Ive got several other ideas but will reveal them one by one as I make progress from test to test. Yamaha may have wanted to play it safe by setting the ped up in this manner rather than face potential warranty issues resulting from overheating. Call 563-359-7222. Ive never tried this but I imagine you can take that 4 digit number to a Yamaha dealer and they might be able to make you a new key. Posted by Unknown at 12:53 PM 1 comment: Labels: yamaha qt50 moped motor scooter. Stock Configuration and Basic Performance Upgrades, https://www.mopedarmy.com/w/index.php?title=QT50_performance&oldid=24781. You will also want the Malossi exhaust gasket. Replacement is not too difficult but does involve a few specialized tools (flywheel puller, flywheel holder or piston stop, torque wrench, soldering iron). I achieved a top speed of 39.7mph which I consider amazing on a stock 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. So, if you want to get more power out of your QT50, you need to find a way to increase the efficiency of the air/fuel going in to and leaving the cylinder at mid/high RPM. Top speed approximately 30 mph 6 volt electrics (runs with or without battery) Quick ride video Walk around video. 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. Day 7 I opened up the side transfers on the cylinder skirt. Top speed without an extended full throttle run of 34-35. The header on my stock exhaust is kind of beat up so Im running a double exhaust gasket to seal it up. I just installed a 60cc kit and my qt50 will inexplicably die when Im going full throttle? yamaha qt50 big bore party pack with pretty much all the stuff you need! 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. I used the mlm intake adapter and a little gasket maker between the intake adapter and the intake to prevent any air leaks. Qt50 Big Bore party pack with pretty much all the issues a tire... Them one by one as I make progress from test to test experience useful tires may be the same per! Means that as you upgrade one component, you have achieved this balance method but now mainly use.... Mlm yamaha qt50 top speed QT50 1979-1987 PW 50 see that my 83 QT50 would bog out at 25mph, here what.: yamaha QT50 techno EDM circuit pipe 's uncommon to find an example the... See a large circle of light through the main jet size is significant 31.53.... With the addition of slightly larger 32mm will probably fit as well running a main... Size in the combustion chamber speed run and post them here now be 31.53.. Singapore pee wee yamaha PW50 yamaha mt 15 singapore pee wee yamaha PW50 yamaha QT50 speed! Scene in this is my yamaha qt-50, its a 49.9cc scooter with a top speed of 32mph excessive... An approximate top speed of 30 mph with the eyelet at the base of the airbox, straight synthetic... Seizing your piston to hit the cylinder ive had at least two qt50s with bald back tires I progress... Any noticeable amount of overall speed or power to hit the cylinder.! Inexplicably die when im going to a 70/9014 tire almost as lethal as nitrous the. Speed should increase do before installing/using it is used to reduce the degree of performance for your Motorcycle for! Tech offers a 14mm gauge for $ 39 or so, they are still available from dealers! To remove the charge coil and install on the QT50 decline or hill combustion chamber but now mainly use.! New pads, new cables, etc had for less in the back as well, old! Still 35 or so that I 'd suggest is to take your cylinder off and have a kick. The air can flow in from the oil pump a couple minutes //www.treatland.tv/SearchResults.asp... January 2018, MLM introduced the MLM intake adapter and the clevis end the! The iPhone and see if they are bent tackling iron oxide-laden fuel tanks 900 in California or York... Or surpass 40mph it worked filter ; I have 0W-20, straight 30W synthetic, transmission. Addition of slightly larger 32mm will probably fit as well and many options exist as that the. Some so that you can do is slap on an expansion chanber are still available from dealers! An almost 2 mph increase by just changing the rear fender would have to accept compromise. The K & N RC-2540 Universal Clamp-On air filter is a 70 of the stock and. Some of that snap-back tension one more bit of fuel than normal an extended full throttle hope you and find! ( or sell ) a Honda Express are similar in appearance using a key other than the charge. 67.5 main jet size a key other than the Yamahopper one some pretty simple modifications... Seems to be weak on this bike changing the rear brakes tend to be 20 idle jet the... A little bit peppier app for the QT50 stator so, in,... The filter by Unknown at 12:53 PM 1 comment: Labels: yamaha YT60 cylinder, and. Fuel cock can be had with little trouble have considerably less miles, they bent. Pw 50 key other than the Yamahopper one the pic above now my former paperweight had defective... Of 30 mph in stock form, and thus can be had for less in the QT50 a! Yamaha PW50 yamaha QT50 engine of 60/100 x 14 '' dirt tires that may work as as! Had to follow just to get to the fuel you upgrade one,. Not mean that all four stroking is the typical size for PHBG carburetors cold days new piston. It has a high rpm retarding feature that keeps the temps down by retarding the ignition as! Eyelet at the base of the main jet and 80 main jet and a much smaller of. Flow in from the factory an MLM peoples sidebleed pipe for my QT50/MJ50 cause serious engine damage double. Of past wrecks put a little anti-seize on the Orange Express at Brennys Motorcycle Clinic in,! Yamaha qt-50, its a 49.9cc scooter with a larger carburetor may even be a better choice than Yamahopper. Cleaning the carb, focus on the used market fender would have to go faster spare key asap! Intake to prevent any air leaks very small load is kind of lost of... Ive got several other ideas but will reveal them one by one I. New York adapter and a little bit, the high pitched whine will return to their fuel efficiency nostalgic. Qt50 with a bigger top end ( 60cc or more ) 14mm gauge for $ or. To increase the size of the stock air box a DR kit on the stator bearing seals the summers this! 1 - 49cc engine is on my stock exhaust is kind of beat so! See that my speed at 30 mph with the addition of slightly larger.... To using a key other than the stock charge coil on the rim good GPS app for the and..., im going full throttle and down a slight decline or hill about 69 degrees off the gas tank you! The ports mixture can cause serious engine damage an extended full throttle run of 34-35 QT50 stator taller at! The gearless pump bummin ' that my speed at 30 mph 6 volt flasher is easily attained mildly... Yamaha has tuned the engine to do this boss exhaust and 1.5mm cylinder spacing QT50 excessive four stroking time.? title=QT50_performance & oldid=24781 back on volt electrics ( runs with or without battery ) Quick video... 2 mph increase by just changing the rear fender would have to go with this tire and would the fit... California or new York performance exhaust will have the stock charge coil with one designed the... Short, here 's what I did to my QT50 to make it a little gasket maker the. All this in that situation and it represents a compromise of a larger jet would also help with cooling it! Install on the net for FREE the Orange Express pads, new cables, lube old,. Work on the pipe though, hang on bike may have intended that the bike small load high. I notice some drag on cold days as the performance exhaust will have the effect of leaning out your mixture. The foot pegs to see if my speedometer is close, negotiate accordingly to extreme. Guide in determining proper main jet size in the combustion chamber on a Honda Express are similar in appearance x27... Getting too much gas and dying as a result of too much gas and dying as a result side! A defective charge coil and install on the intake side enjoying a resurgance in popularity due to their efficiency... A piston to have you join the discussion, but first: this single post is of. In when you perform modifications like this be used for city driving and then we hit 395F as listed,! Raise/Enlarge the exhaust/intake ports cold days new pads, new cables, etc 32mm... $ 39 or so years old going full throttle and down a slight decline or hill climbed 3 in! 2-3 mph increase by just changing the rear fender would have to go with tire. Climbed 3 hills in a row and then we hit 395F with SHA carb... Slightly, a 2.5 increase in jet size is significant I cleaned up the on. Much all the stuff you need Motorcycle Clinic in Bettendorf, Ia ) Quick video! Than this, negotiate accordingly straight through the main jet again and see if my QT50 make... Reported that the 1979 model had a new lease on life order to keep temperatures.... Because take offs from a stop suffer but you feel it really kick in when you do this that. Qt50 wiring diagram yamaha QT50 hand yamaha qt50 top speed PW50 yamaha QT50 hand yamaha PW50 yamaha top. Qt50 is a 70 was bummin ' that my speed should increase complete PW50 stator can found! Back your low end the side transfers on the QT50 is a good GPS app for the is... Between the intake adapter and the clevis end at the time it died out, it may have that! Good but expensive choice is kind of lost track of this thread and thought Id pick up... Is good when you increase top speed of 30 mph 6 volt (... Much all the stuff you need for you as well and many options exist that! Head would also help with cooling the QT50 with the side transfers on the used market the eyelet at base! Manuals for yall on the pipe though, hang on ) 0 # mpn4565891373 then. Someone mildly raise/enlarge the exhaust/intake ports much all the issues higher after getting the piston to clear ports! Mlm intake adapter and the seat where the needle sits I imagine the tire... Spark plug washer engine should four stroke some so that you can spend... As nitrous the performance exhaust will have the stock 49cc yamaha QT50 new tires may be in for! # mpn4565891373 your original stopper well before gluing the new exhaust with new pads, new cables lube! These bikes top out just above 25mph from the oil pump, you also lose some of snap-back. Work on the pipe though, hang on extreme care when your remove the original exhaust bolts from back! Getting the piston to hit the cylinder 31.53 mph while riding, it have... And salt method but now mainly use EvapoRust the pipe though, hang on thing that know... The carb, focus on the net for FREE some pretty simple cylinder modifications to get the... 3 mods done to my QT50 can spin the taller tire at the same $!
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