yamaha qt50 top speed

Yamaha's conservative approach leads us to our first performance upgrades. Add a 3-4mm copper/aluminum spacer to the base of the cylinder and deck the cylinder the same amount. 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. 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. I just bought an MLM peoples sidebleed pipe for my QT50/MJ50. Because I opened up the reed block slightly, a 2.5 increase in jet size is significant. Check and see if all the lights and horn work. We are ready to rock as soon as the weather cooperates. To see our full inventory go to brennys dot com. So it has a 67.5 main jet in it now but a 70 jet is way too rich. (make sure you keep your filter clean & lubed religiously or the dirt you could suck in will eat away at your piston rings and decrease your cylinder compression!!) 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. Im also running it without a head gasket after shaving the cylinder head flat. In sunshine red with some fresh updates. Day 5 So I went from 34-35 with next level pipe to 39.7 with circuit pipe. What you are really experiencing is the engine four stroking as a result of too much fuel in the combustion chamber. 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). Ill continue this list over time because there is a lot you can do to go faster on a qt50. South of the gas tank is the resting place of the qt's petcock. The simplified driveshaft setup makes wheel changes easy. My initial acceleration may be a bit slower with the bigger rear tire. 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. Im currently running 10W-40 conventional oil and I think I notice some drag on cold days. . And cylinder got sanded down after 1.5mm of spacers added to open up all ports fully except intake at BDC. You can help Wikipedia by expanding it. What a ride it was! 6. If I bump up to an IRC NC 77 tire, Im going to a 70/9014 tire. After the main jet, dial in the jet needle. In late 2017, MLM came out with the QT50 Next Level Stock Pipe. clutch yamaha qt50 hand yamaha pw50 yamaha mt 15 singapore pee wee yamaha pw50 yamaha qt50 wiring diagram yamaha qt50 top speed. Day 6 I let her eat today. When you increase top speed, make sure to upgrade your brakes with new pads, new cables, lube old cables, etc. No such rev limiter exists. Another option is to pull out the oil injector, remove the plastic gear on the end and then re-install. Plastic parts may be the most difficult of all as they did not age well if left in the elements. Chances are you still wont get a good idea of how rusty the tank is even by doing this. Of course, this would retard the timing at all rpms and may not be ideal. A 69 jet seems better for that Orange Express. 4. 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). In short, here's what I did to my QT50 to make it a little bit peppier. #4 Get an aftermarket mesh air filter. The puch head keeps her cool. The immediate goal is to break 40 and then shoot for 45 mph. 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. Youd seize before you got to 40. 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. I can tell because take offs from a stop suffer but you feel it really kick in when you get up to speed. It's uncommon to find an example of the QT50 with the side covers that go on either side of the stock air box. A popular choice is the IRC NR-77 moped tire: 14 x 70/90. Look how wrong you can be. Right and left side crankshaft seals can be found on ebay or treatland.tv. What should I look for? The QT50 and the Honda Express are similar in appearance. Check the header on your exhaust and determine whether it is an "S" shape between the flange and silencer or more of a straight shot between the two. What you are experiencing is a phenomenon known as four-stroking. This leads to hacking into the wiring. Now if my old rear tire is bald, I may be increasing my top speed by even more. You may have to resort to the numerous methods outlined in this wiki for tackling iron oxide-laden fuel tanks. The Jog CDI has five wires as opposed to the QT50's four. 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. 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. Luckily for me, my dad was able to do this for me (I was 14 at the time) and given enough room and no headwind, it would achieve 35-37 mph on level ground with the airbox mod and the stock pipe/muffler. I can bump up the pilot jet instead though. 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. Headlight doesnt work subtract $45; 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. QT50 air filter options - Any talk of bigger carburetors or larger top ends has to include air filters. 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. Reply Tim Doll / barneyfife OP Jan 11, 2020 12:19AM Sorry about that ,missed one small detail $650 Reply Bob Naske / bobqt50 As with any engine modification like this, you will need to install a larger main jet in the carburetor. Signaler un abus. A temperature gauge is mission critical to keeping your piston from soft seizing. Next step will be to change transmission oil and see if we get any gains or, worse yet, lose any speed. Waiting on puch head to arrive. Current set up is vm18 carb, 65 main jet, mlm next level pipe, pw gears, 16" rear tire, 1.0mm spacer. 35-36 is about limit with next level pipe and 49cc. A rusty tank isnt a deal breaker as you can buy a better used tank on ebay; however, finding one in good condition and in your bikes color may be a challenge. If I recall correctly, my QT50 topped out around 31 on level ground w/ no headwind after this mod alone. Although unlikely that any significant difference exists, the straighter version contributed more to performance than the "S" shaped version. One leads to the oil pump and one leads to the carburetor. Didnt have gps on today. Had a high temp of 387F and I wasnt even pushing it hard. 2 stroke engines are designed to four stroke in certain situations. I could do longer full throttle runs. With a fully open exhaust port expect gains of 3-4 mph. Half the package or less is plenty. I have 0W-20, straight 30W synthetic, synthetic transmission fluid. Make sure you clean your original stopper well before gluing the new one to it. 7. 1. 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. 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. 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 following is a guide of some sorts of what CAN and CANNOT be used while restoring this guy It CAN use the same Shock as the QT50 It CANNOT use the QT50 crank It CANNOT use the Chappy crank It CAN use the same CDI magneto as the QT50 When it did get heat soaked, it snuck up to 394F and I had to ease off quite a bit. Both front and rear brakes become weak points when top speeds near or surpass 40mph. So my first top speed experiment will be to try a lighter weight synthetic oil to see if I obtain a noticeable speed increase. I ordered a puch 40mm head. > Hey, so do I. I'm running a 60cc top end on my QT with the Towny bottom > end. I solved it by going from a 102.5 jet to an 87 and finally to an 85 main jet. Puch head arrives Monday. The QT50 drive train was shared by the Tri-Zinger and PW50. I had these 3 mods done to my QT50 and it really enhanced my enjoyment of riding it around during the summers. The VM18 will require MLM's intake designed for the VM18. $650 in Ohio may be the same as $900 in California or New York. Many have reported that the 1979 model had a defective charge coil on the stator. Im hoping an extra 25 psi helps out quite a bit. Top speed of 28.5. 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. QT50s and other mopeds are enjoying a resurgance in popularity due to their fuel efficiency and nostalgic appeal.

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