The Jog CDI is purported to retard timing at higher rpms and thus lead to lower operating temperatures. Yamaha used two different stock exhausts on the QT50. 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. a video on this modification here at the bottom of this page. Even if you already have one key, have a spare key made asap. Current set up is vm18 carb, 65 main jet, mlm next level pipe, pw gears, 16" rear tire, 1.0mm spacer. Id be happy with 1 mph. #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. Better a fouled spark plug than a seized piston, right? this setup is perfect for gaining some top speed and torque, but still having a quiet-ish bike that isn't over stressed. Or this could cause your engine to overheat and your piston to hit the cylinder. 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). Remove the charge coil and install on the QT50 stator. At the time it died out, it was still accelerating! 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. If you dont use a gasket or gasket maker, youll need a bigger main jet. Buy yamaha qt50 online with fast delivery and free shipping. I thought over the next few weeks Id perform some experiments on my stock NC50 to see how fast I could get it to go without using any performance parts (I do have a K&N hi-flow air filter). You will also want the Malossi exhaust gasket. 35-36 is about limit with next level pipe and 49cc. The Yamahopper has an approximate top speed of 30 mph in stock form, and thus can be used for city driving. In 2018, MLM introduced the MLM yamaha QT50 techno EDM circuit pipe. . Adjust the oil injection pump; I also went to a BP4HS plug and ditched the colder BP6HS plug. So I can compare temps between stock head and puch head. Yamaha QT50 Cables & Brackets. 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. I got a mid-top end pipe from DG that was made for the QT50. Bottom line no matter what you pay for one, count on putting in a couple hundred in parts and several hours of your time in making it truly road ready. 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. 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. . To see our full inventory go to brennys dot com. The header on my stock exhaust is kind of beat up so Im running a double exhaust gasket to seal it up. Hey, so do I. I'm running a 60cc top end on my QT with the Towny bottom end. Heres a nice picture of the stock tire vs. the IRC tire. Because I opened up the reed block slightly, a 2.5 increase in jet size is significant. 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. When it did get heat soaked, it snuck up to 394F and I had to ease off quite a bit. Thanks to this handy calculator, I see that my speed at 30 mph with the old rear tire should now be 31.53 mph. Ill put the circuit pipe on next and we should jump to over 40. 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. 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). Waiting on puch head to arrive. What should I look for? PW50 rear gearing should also keep things cooler as the engine does not work as hard to go the same speed. I learned it well as I rode my QT50 when I was 14-16 years old and still in high school. When you do successfully extract them, replace them with new bolts of the correct size. You can wire in a different CDI following the diagrams from here: Hobbit CDI Wiring. With all these upgrades, youll want to make some changes to keep that engine from getting hot, hot, hot (jetting, retard the timing, replace crank seals, colder plug, etc.). Just drill a couple holes for some small screws and nuts (thread locker is handy here). 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. Universal Rubber Sleeve by Motion Pro. The K&N RC-2540 Universal Clamp-On Air Filter is a good but expensive choice. yamaha qt50 big bore party pack with pretty much all the stuff you need! 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. QT50 Oil injection removal - An oil injector block off plug can be found if you choose to go to premixed fuel. 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! Cone mesh air filters of the 28-29mm variety are plentiful and cheap on eBay or amazon and equally effective. 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. The QT50 has a sealed beam headlight. Many attribute this wall to some sort of rev limiter. The Yamahopper has an approximate top speed of 30mph in stock form, and thus can be used for city driving. I had a spare ignition cylinder without a key that someone had given to me with a hopper that I had purchased. 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. I solved it by going from a 102.5 jet to an 87 and finally to an 85 main jet. Now my former paperweight had a new lease on life. The following from the SG50 Wiki page may be applicable here as well: "A common modification among the QT50 crowd is the Yamaha Jog/Zuma 5 wire CDI box. You can gain a little acceleration back by installing stiffer clutch springs. One replacement option is to carefully break out and remove the bulb and cut a slightly bigger opening (if necessary) for a replacement bulb (see the wiki for sealed beam conversion tutorial). A complete PW50 stator can be had for less than $20. 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. After getting it running, this owner will typically jump to getting the 'ped to a higher top speed usually through the addition of a bigger top end. A wiser upgrade path may be performance exhaust > larger carburetor > bigger top end, especially if you have never installed a new top end before. Treatland carries a "70cc" top end with custom machined cylinder heads to match. Youll thank me later. 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. Overheating and piston seizure are traps for the unwary. Top speed without an extended full throttle run of 34-35. If the bike doesnt run dont pay more than $150; Having fun on the Yamaha qt50 Ha ha ha. The bigger rear tire is heavier and your qt50 in stock form may not be able to spin it at the same rpms as the original tire. 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. Unfortunately, I think I had an air leak and carb jetting was not good enough so I suffered a soft seize. I treat all these as non-runners. When I turned 16 and I was able to get a truck, we were looking into getting stronger springs for the clutch so that it would engage at a higher RPM (so it would better negate the loss of low-end power), but we could never find any. Posted by Unknown at 12:53 PM 1 comment: Labels: yamaha qt50 moped motor scooter. I also had the head milled professionally at a local machine shop by a small amount, but I didn't want to accidentally overdo it and end up running premium and octane booster. The wires from your QT motor are: https://www.mopedarmy.com/w/index.php?title=Yamaha_QT50&oldid=27436. This headlight has a replaceable bulb and fits perfectly in the QT50's headlight ring. Of course, this makes me wonder if I can use an IRC NC 77 80/9014 tire. I used a 65 main jet and it seems to be pretty dialed in. Ride, handling, braking and, to a small extent, top speed can be improved with them. If these seals are bad then they will allow more air to enter the engine. The next easiest thing that you can do is slap on an expansion chanber. 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; 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. This motorcycle, scooter or moped-related article is a stub. 2/8/19 Ok, I gave up on the DR kit/stock exhaust combo. 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. So 70mm wide or 2.75 inches wide with an aspect ratio of 90 would make the height 0.81 inches higher than the stock tire. Day 6 I let her eat today. Take a flashlight and take the lid off the gas tank. Didnt have any trouble until I climbed 3 hills in a row and then we hit 395F. 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. 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. If all of these arent true, spend some time correcting the problem(s) now before making performance modifications. Once I establish my current top speed, Ill start making adjustments and see what results. My Yamaha QT50 Saturday, February 7, 2009. 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. The lesson of mopeds and nopeds is to find your next bottleneck and fix it. I might stick a performance exhaust on this next to see how it does. People often screw up the wiring. Crankshaft bearing seal replacement on mj50, qt50 and pw50. 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. 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. New tires may be in store for you as well. Be nice to her. Turn signals and mirrors are also casualties of past wrecks. 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. In short, here's what I did to my QT50 to make it a little bit peppier. ma 50 M Ne completa Junta Conjunto 998030 Yamaha QT50 1979-1987. 3.8 out of 5 stars 64. QT50 charge coil options - The ignition system is another weak point on these bikes. Install different clutch springs to get back your low end. It is caused by too much fuel, too much 2 stroke oil or too much of both in the combustion chamber. Key, have a spare ignition cylinder without a key that someone had given to me with a that... Retard timing at higher rpms and thus can be improved with them get heat soaked, was! In high school is about limit with next level pipe and 49cc 65 main jet here at the it. 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'' top end with custom machined cylinder heads to match install different clutch.... Clamp-On air Filter is a stub rev limiter a spare key made asap and it to... Qt50 moped motor scooter jetting was not good enough so I suffered a soft seize main jet $ ;. If all of these arent true, spend some time correcting the problem ( )... On this modification here at the bottom of this page kit/stock exhaust combo avoid! Old rear tire should now be 31.53 mph successfully extract them, replace with... Gas tank a new lease on life install different clutch springs to back.
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