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. If it will do its top speed of 29-30 mph, youre in luck. 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. 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. If the bike pulls to one side while riding, it may have bent forks. Needless to say I didn't do any calculations to figure out how much to actually take off the head. Or fastest delivery Jan 20 - 24 . You can help Wikipedia by expanding it. Stay tuned. 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. Caveat: if you use a metal spacer/rev plate to raise the cylinder and open up the exhaust port, your initial acceleration will be negatively affected. This was helpful on the urban express project. Ill repeat that: Prices vary throughout the country so this is just a general guide. The content producer assumes no liability for property damage or injury incurred as a result of any of the information contained in this website. Im going to look at changing the jetting next. But, I was also riding with a full open throttle. Thats an almost 2 mph increase by just changing the rear tire. At 70mm wide or 2.76 inches, the IRC provides almost an extra half inch of rubber on the road compared to stock 2.25" tires. I was bummin' that my 83 QT50 would bog out at 25mph. Again, a performance exhaust will call for a larger main jet in the carburetor. Pull off the battery cover and check out the wiring in the back as well. Once I establish my current top speed, Ill start making adjustments and see what results. A combination of the above. pwonly.com offers up a 50cc top end with a decked cylinder and a 4mm rev plate if you choose not to do the work yourself. Yamaha QT50 Tim Doll / barneyfife Jan 10, 2020 10:45PM Yamaha QT50 for sale excellent condition 2500 miles, clear title , one owner. 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; Another culprit in QT50 excessive four stroking is the oil pump. I talk about this above. It has the exact same wiring and driveshaft as the QT50 and the same 2 speed automatic engine as the Chappy. Crankshaft bearing seal replacement on mj50, qt50 and pw50. Buy yamaha qt50 online with fast delivery and free shipping. 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. On a large ride, I was able to keep up with the Puch's and Carabela's. Compression was low (110 psi) until I put the stock head back on and removed the head gasket (135 psi now). If it doesnt pass all the tests above, subtract as follows: Very rusty gas tank requiring replacement $80-100 deduction; The Yamahopper has an approximate top speed of 30 mph in stock form, and thus can be used for city driving. QT50 rear shock options - Just about any 320mm mono shock will work to replace the stock shock. Trail Tech makes a temperature gauge which has a copper washer that replaces your current spark plug washer. To combat this, many riders have eliminated the oil pump and replaced it with an oil plate block-off or an automotive freeze plug. Or your crankshaft seals are bad and need replaced. In stock configuration, the QT50 will hit about 29-30 mph. My original plan was to keep this Express as quiet as possible and the DR kit has a reputation for being loud. For example, adding a performance exhaust will most likely necessitate a larger carburetor which will require a larger intake. Had a high temp of 387F and I wasnt even pushing it hard. Controlling the heat produced by a bigger top end and/or a performance exhaust is a common issue with QT50s. Now if my old rear tire is bald, I may be increasing my top speed by even more. I can't believe that my county/town cops never approached me concerning its legality in my state given how much louder it was. Installing a temperature gauge is always a great idea when you perform modifications like this. Im looking at a QT50 that Im thinking about buying. Used Ulysse Speedometer app for my Verizon Thunder. Unfortunately, its fairly common for people to lose the key. Want to post in this forum? 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. Im still undecided on what weight synthetic oil to try. What follows are my attempts to obtain the best performance from the stock 49cc Yamaha qt50 engine. Yamaha used two different stock exhausts on the QT50. Of course, this would retard the timing at all rpms and may not be ideal. I just installed a 60cc kit and my qt50 will inexplicably die when Im going full throttle? So the caveat here is just because it runs and rides well doesnt mean you are home free. Unfortunately, I think I had an air leak and carb jetting was not good enough so I suffered a soft seize. When you increase top speed, make sure to upgrade your brakes with new pads, new cables, lube old cables, etc. This is my yamaha qt-50, its a 49.9cc scooter with a top speed of 32mph. Reply. 35-36 is about limit with next level pipe and 49cc. Anything goes - only rule is keep the 49cc engine. Still waiting on a real cylinder head to arrive. I also went to a BP4HS plug and ditched the colder BP6HS plug. Does my QT50 have a rev limiter or some other device which governs the top speed? I will post a better video when its not so windy. 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. The next easiest thing that you can do is slap on an expansion chanber. South of the gas tank is the resting place of the qt's petcock. 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. Call 563-359-7222. Chances are you still wont get a good idea of how rusty the tank is even by doing this. Next step will be to change transmission oil and see if we get any gains or, worse yet, lose any speed. My experience has been that the 5 wire Jog CDI goes into full retard on the QT50 as well. 1. yamaha qt50 big bore party pack with pretty much all the stuff you need! The MLM exhaust will also require you to install a bigger main jet. I can't even begin to count the number of brake drums that I went trough, both front and rear. 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. When it did get heat soaked, it snuck up to 394F and I had to ease off quite a bit. 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. The rear brakes tend to be weak on this bike. Listen to her now: Ive heat cycled it several times and will take it on some break in rides as the weather cooperates. 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. For Cable Housing. What you are experiencing is a phenomenon known as four-stroking. People often screw up the wiring. The lesson of mopeds and nopeds is to find your next bottleneck and fix it. Yamaha PW50 rear gears. 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. 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. Jetting is lean so gotta change that and couldnt really go full throttle for too long as temps got hot. Re: RPM gauge for the Yamaha QT50. A larger carburetor may even be a better choice than the stock carburetor with a larger jet. Tire width goes to 3.15 inches and top speed goes to 32.71 mph. I had this problem and it caused me to tear my hair out because I kept chasing the too little gas theory. That puch head made a noticeable difference on cooling as I could do much longer full throttle runs. If it goes slower than this, negotiate accordingly. A bigger cylinder head would also help with cooling. Your QT50 is just getting too much gas and oil. Or they were taken off, put in some corner of the garage, and were discarded in an annual garage clean-out or couldn't be found to accompany the bike to a new buyer. ma 50 M Ne completa Junta Conjunto 998030 Yamaha QT50 1979-1987. Features: Perfect mounting 24mm ID header super thick mounting flange heavy duty front mount tab High temp black powder coat very well made and appealing bolt-on heat shield, no more leg burns And..a really really good night's sleep knowing you bought the right pipe note this does not come with an exhaust gasket so pick one up here! Web designers, SEO consultants, etc. Proper jetting of the carburetor (main jet, jet needle, and idle jet) is critical to keeping temperatures in a manageable range. Noped Thursday 2.03K subscribers Subscribe 3.7K views 4 years ago Some further tweaks yet but 49.1 mph. 2 stroke engines are designed to four stroke in certain situations. You will also want the Malossi exhaust gasket. So it has a 67.5 main jet in it now but a 70 jet is way too rich. Having fun on the Yamaha qt50 Ha ha ha. 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. What should I look for? Anything goes only rule is keep the 49cc engine. Install a new and bigger rear tire. 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). Both front and rear brakes become weak points when top speeds near or surpass 40mph. Reducing four stroking through a smaller main jet, more free-flowing air filter or both might get you 1-2 mph more. 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. In terms of keeping temperatures down, you will want to replace your crank shaft bearing seals. 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 . Ive began another Express speed project. In its factory form, the Yamaha QT50 should reach a top speed of around 28-30 mph. Now the air can flow in from the back of the airbox, straight through the filter and into the carb. I ordered a puch 40mm head. Once kicked to life with the reverse-mounted, left-side kickstart lever, the key is turned to "run" and the engine is able to rev freely. Just from this mod, I gained power throughout the RPM range, and I was able to leave other QT50s in the dust off of the line and at top end at willeven in instances where I was 40-50 pounds heavier than the other rider. Home. 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. Once you get all this squared away, the MLM pipe can give you performance gains in the neighborhood of 7-8 mph. 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. The other half of the compromise is when the engine has a significant load on it (like going uphill), more fuel is available to it at full throttle. 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. 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. Generally, if you let off the throttle a little bit, the high pitched whine will return. Better a fouled spark plug than a seized piston, right? 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. As mentioned above, the stock main jet (size 70) and the oil injector cause an overly rich and wet (too much oil) condition. Most of the parts for the QT50 are still available from Yamaha dealers. So I can compare temps between stock head and puch head. I ordered a puch 40mm head. 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. The Dell'Orto SHA 15.15 will also work on the stock QT50 intake with an o-ring on the intake side. Will change jet and try again. This part is used to reduce the degree of performance for your motorcycle, for yamaha. Yeah, Im an oil freak. Maybe Ill shoot for Pete Roses number. Motion Pro Rubber Sleeve (11-0045) 0 # mpn4565891373. Day 4 took the qt out for a ride with Puch head and almost fully opened ports. Top of the cylinder jug must be decked by the same thickness so that the piston returns to the top of the cylinder at Top Dead Center. 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. 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. Signaler un abus. Low end was miserable at 110 psi. Sharing an entire drive train with a fairly current children's dirt bike means most things can be had readily from your local Yamaha dealer. 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! I believe that Yamaha used a lousy charge coil on all models. A stock QT50 has a top speed of 30 mph, and takes a while to reach it. Handling can be greatly improved with the addition of slightly larger tires. The header on my stock exhaust is kind of beat up so Im running a double exhaust gasket to seal it up. 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. One had an "S" shaped header and the other had a much straighter header. 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. Day 3 I put a bigger pilot jet in the blue Qt. This page was last edited on 13 January 2018, at 17:44. 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. See if the side covers are still installed. 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). Youd seize before you got to 40. Im located in Ohio. Wiring issues subtract $100; Prices vary throughout the country. MLM makes a performance exhaust for the QT50, the MLM Yamaha QT50 People's Sidebleed Pipe. Mine changes gears . Manufactured. QT know's she isn't fast, but she'll give you all she's got if you just let her do her stuff. Keep this principle in mind. If I recall correctly, my QT50 topped out around 31 on level ground w/ no headwind after this mod alone. Rusty tanks can also be cleaned up and made to work. So you want your Honda Express to go faster. 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. Both carburetors will require you to switch from the oil injection to using premixed fuel although a Dell'Orto SHA can be found with an oil injection inlet. I got a mid-top end pipe from DG that was made for the QT50. If all of these arent true, spend some time correcting the problem(s) now before making performance modifications. 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 think 2-4 mph is a bit optimistic. Many QT50 owners initially cannot get past 25 mph or so because of the resultant four-stroking. 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. I go over some pretty simple cylinder modifications to get more speed.spacers - https://www.treatland.tv/SearchResults.asp?Search=honda+metal+spacer+basespac. Ive got several other ideas but will reveal them one by one as I make progress from test to test. A slightly larger 32mm will probably fit as well and many options exist as that is the typical size for PHBG carburetors. Use caution and patience when removing your old, rusty, tired, ready-to-snap exhaust bolts. [1] The QT50 motorcycle resembles contemporary Mopeds and shares some features with Scooters. 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. Heres my Orange 77 Express with SHA style carb which was good for a 2-3 mph increase over stock carb. I can tell because take offs from a stop suffer but you feel it really kick in when you get up to speed.
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