Ive had at least two qt50s with bald back tires. Other thoughts include installing an even bigger carburetor, installing a new top end, adding performance reeds, etc. -DO NOT CONTACT ME. These are usually the first things that are misplaced. It also seems to help if you reconnect the common ground shared between the charge coil and the light coil. 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 QT50 Cables & Brackets. 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.). 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. Needs both tires subtract $95-105; 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. Maybe Ill shoot for Pete Roses number. Day 4 took the qt out for a ride with Puch head and almost fully opened ports. The immediate goal is to break 40 and then shoot for 45 mph. Maybe sooner if you want to be more cautious. Reducing four stroking through a smaller main jet, more free-flowing air filter or both might get you 1-2 mph more. I imagine the rear fender would have to go with this tire and would the tire fit on the rim? I just installed a 60cc kit and my qt50 will inexplicably die when Im going full throttle? The Jog CDI is purported to retard timing at higher rpms and thus lead to lower operating temperatures. Stock main jet size in the QT50 is a 70. I'll make videos of each top speed run and post them here. The next easiest thing that you can do is slap on an expansion chanber. 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. #4 Add a new exhaust gasket and put a little anti-seize on the new bolts before installing. Is there anything else I need to do before installing/using it? Signaler un abus. 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. Its like an old house. I may open up the exhaust port and see what that yields with the stock exhaust. Be mindful of not completely eliminating all four stroking. I got manuals for yall on the net for FREE! 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. Trail Tech offers a 14mm gauge for $39 or so. Call 563-359-7222. Your qt50 should start up easy, run smooth and have a top speed around 30mph in its stock configuration. Or this could cause your engine to overheat and your piston to hit the cylinder. How do I fix it so that my center stand/kickstand doesnt hit it? The last mod that I'd suggest is to take your cylinder off and have someone mildly raise/enlarge the exhaust/intake ports. Web designers, SEO consultants, etc. The rear brakes tend to be weak on this bike. Rinse and repeat several times. Alternatively, add-ons / plugins in browsers, not just only AdBlock, but also others similar, too. 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. Ok, so I put a DR kit on the Orange Express. A 40 year old bike will need almost everything looked into. I got my MC license on that scooter. Prices vary throughout the year with the change of seasons. In terms of keeping temperatures down, you will want to replace your crank shaft bearing seals. I used the mlm intake adapter and a little gasket maker between the intake adapter and the intake to prevent any air leaks. > Hey, so do I. I'm running a 60cc top end on my QT with the Towny bottom > end. I will post a better video when its not so windy. 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! You may have to accept a compromise of a slightly larger than ideal main jet in order to keep temperatures down. And I refuse to pay more than $150 for a non-runner. 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. Ok, I changed the transmission oil to 5W-30 and lost 0.9 mph. Worth it? 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 . 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 New bolts with some anti-seize compound are recommended. This does not mean that all four stroking is bad. A temperature gauge is your best friend and a cheap insurance policy on your quest for better performance. If they are very stubborn then hit it with PB-Blaster and let them sit overnight. What you are really experiencing is the engine four stroking as a result of too much fuel in the combustion chamber. Will change jet and try again. 278-27114-00) and super glue it to the original stopper so that you have two stacked together. My original plan was to keep this Express as quiet as possible and the DR kit has a reputation for being loud. 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. Ive got several other ideas but will reveal them one by one as I make progress from test to test. Re: 1982 Yamaha QT50 Yamahopper 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. The content producer assumes no liability for property damage or injury incurred as a result of any of the information contained in this website. 6. It four-strokes fairly easily in the stock configuration so that you don't overheat and soft-seize under low load at full throttle. 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. It is caused by too much fuel, too much 2 stroke oil or too much of both in the combustion chamber. 4. A bigger cylinder head would also help with cooling. 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. We are ready to rock as soon as the weather cooperates. A 69 jet seems better for that Orange Express. Day 1 49cc engine is on my blue qt50. To combat this, many riders have eliminated the oil pump and replaced it with an oil plate block-off or an automotive freeze plug. Web designers, SEO consultants, etc. New and used parts are often found on eBay as well. I can bump the main jet again and see if that does the trick. It can be incredibly frustrating to spend $200 on a performance exhaust and then have the kickstand bang it every time you use it. Bent forks such that it pulls hard to one side when riding subtract $85; QT50 charge coil options - The ignition system is another weak point on these bikes. The Yamahopper has an approximate top speed of 30 mph in stock form, and thus can be used for city driving. 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). Such puny gains are not going to satisfy your QT50 fanatic. Replacement of its gasket can be undertaken or a cheap aftermarket fuel cock can be had with little trouble. 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. Wiring issues subtract $100; Reply Stephen Keller / keller_stephen Jan 10, 2020 11:49PM Price? 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. The QT50 and the Honda Express are similar in appearance. 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. Once it gets on the pipe though, hang on! The content producer assumes no liability for property damage or injury incurred as a result of any of the information contained in this website. Try a hotter spark plug; Im also running it without a head gasket after shaving the cylinder head flat. 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've got several other ideas but will reveal them one by one as I make progress from test to test. Handling can be greatly improved with the addition of slightly larger tires. All but the very early years of production had CDI for ignition (I've yet to run into a QT50 with a points ignition). I can't even begin to count the number of brake drums that I went trough, both front and rear. Many QT50 owners initially cannot get past 25 mph or so because of the resultant four-stroking. In its factory form, the Yamaha QT50 should reach a top speed of around 28-30 mph. Top speed of 28.5. The Yamahopper has an approximate top speed of 30mph in stock form, and thus can be used for city driving. Day 1 - 49cc engine is on my blue qt50. 3. Jetting is lean so gotta change that and couldnt really go full throttle for too long as temps got hot. Stay tuned. Eliminate your oil pump and just use pre-mixed gas/oil at a specific ratio (50:1 or so); Yamaha's conservative approach leads us to our first performance upgrades. Top speed run, super windy and about 69 degrees. It is considered a motorcycle by most states. Yamaha may have intended that the bike run rich to promote engine life. Headlight doesnt work subtract $45; Used Ulysse Speedometer app for my Verizon Thunder. This part is used to reduce the degree of performance for your motorcycle, for yamaha. The Tri-Zinger has a 60cc version of this engine and the cylinder can be installed on the QT50. After the main jet, dial in the jet needle. 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. Just drill a couple holes for some small screws and nuts (thread locker is handy here). But Im not sure how far down the rabbit hole I want to go on this one. 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. 35-36 is about limit with next level pipe and 49cc. Honda Express with tecno boss exhaust and 1.5mm cylinder spacing. Look how wrong you can be. 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). In 2018, MLM introduced the MLM yamaha QT50 techno EDM circuit pipe. Most of these bikes are around 40 years old. Kevlar brake pads and stiffer clutch springs! Titled and ready to go. If the bike doesnt run, make sure you can push down the kick start with ease. I also went to a BP4HS plug and ditched the colder BP6HS plug. Future topics to be covered: 6. Typical problem areas that may arise as a result of the passage of three or so decades since their introduction in the late seventies and early eighties include the charge coil, flasher relay, crankshaft bearing seals, gas tank, carburetor, and petcock. Theres a lot more flow now. Home. Although unlikely that any significant difference exists, the straighter version contributed more to performance than the "S" shaped version. Prices vary throughout the country. Next step will be to change transmission oil and see if we get any gains or, worse yet, lose any speed.