You more than likely over-jetted. 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. #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. ma 50 M Ne completa Junta Conjunto 998030 Yamaha QT50 1979-1987. Many attribute this wall to some sort of rev limiter. 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. Web designers, SEO consultants, etc. Ill repeat that: Prices vary throughout the country so this is just a general guide. New tires may be in store for you as well. 5. 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. Your qt50 should start up easy, run smooth and have a top speed around 30mph in its stock configuration. When you increase top speed, make sure to upgrade your brakes with new pads, new cables, lube old cables, etc. But, I was also riding with a full open throttle. When I grabbed a handful of throttle when on the pipe (anywhere above ~18mph for mine), that tiny chainsaw motor meant business! 3. This filter will allow the engine to get more air. I'll make videos of each top speed run and post them here. Wiring issues subtract $100; 8/6/2018 So I kind of lost track of this thread and thought Id pick it up again. 2. Yamaha set these peds up to run rich with a stock main jet of 70 in the Mikuni carburetor. Adjustment of the front and rear fender stays will most likely be necessary to accommodate these tires. This does not mean that all four stroking is bad. The Yamahopper has an approximate top speed of 30 mph in stock form, and thus can be used for city driving. Now my former paperweight had a new lease on life. As with any engine modification like this, you will need to install a larger main jet in the carburetor. My Honda Express at the time of purchase. I put 15,000 mile's on it. 6. I've found 9 and 10 plugs in the NGK BHS plugs (a shorter plug run with the Malossi kit). If your bike was owned by a kid in the past, your back tire may even be bald. 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. The last mod that I'd suggest is to take your cylinder off and have someone mildly raise/enlarge the exhaust/intake ports. You can get Dellorto jets in increments of one so I could experiment with a 64 or 66 main jet. The QT50 has the main throttle cable leading to a throttle junction where it separates into two cables. Id be happy with 1 mph. 3.8 out of 5 stars 64. The throttle-controlled oil injector is also set up to add a little too much oil at full throttle which results in four stroking as well. I ordered a puch 40mm head. 8. To see our full inventory go to brennys dot com. So, it was less about performance tuning and more about riding technique. I just bought an MLM peoples sidebleed pipe for my QT50/MJ50. And I refuse to pay more than $150 for a non-runner. The next easiest thing that you can do is slap on an expansion chanber. 4. Buy yamaha qt50 online with fast delivery and free shipping. Available at Brennys Motorcycle Clinic in Bettendorf, Ia. Signaler un abus. I replaced both crank shaft bearing seals prior to installing the kit. I think 2-4 mph is a bit optimistic. Puch head arrives Monday. I also went to a BP4HS plug and ditched the colder BP6HS plug. Turn signals and mirrors are also casualties of past wrecks. Hey, so do I. I'm running a 60cc top end on my QT with the Towny bottom end. It also leads to using a key other than the Yamahopper one. Install a bigger top end kit or modify your stock cylinder. Popular modifications include: Yamaha YT60 cylinder, piston and rings. You will need to replace your main jet with a bigger main jet. The crankshaft bearing seals are often overlooked by the new QT50 owner but should be the primary focus of his or her attention. My Yamaha QT50 Saturday, February 7, 2009. The engine needs more fuel going uphill because it is under a bigger load. A temperature gauge is your best friend and a cheap insurance policy on your quest for better performance. 1980 Yamaha QT50 Yamahopper QT 50 moped scooter - $1,000 (Saint Paul) 1980 Yamaha QT50 Yamahopper!! If it doesnt pass all the tests above, subtract as follows: Very rusty gas tank requiring replacement $80-100 deduction; I had these 3 mods done to my QT50 and it really enhanced my enjoyment of riding it around during the summers. But no worries. In the end, I was able to get the QT50 consistently up into the 35-40 mph range even on slight uphills, and I was able to almost hit 50 going downhills and also by catching a lucky draft from an SUV on level ground (which was probably one of the dumbest things I've done in my life so far). 1. 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. It has a high rpm retarding feature that keeps the temps down by retarding the ignition timing as the rpms increase. Ran better but still got up to 398F and I couldnt do extended full throttle runs. This page was last edited on 13 January 2018, at 17:44. Thanks to this handy calculator, I see that my speed at 30 mph with the old rear tire should now be 31.53 mph. Even if you already have one key, have a spare key made asap. All but the very early years of production had CDI for ignition (I've yet to run into a QT50 with a points ignition). Titled and ready to go. Tire width goes to 3.15 inches and top speed goes to 32.71 mph. You need one with the eyelet at the top and the clevis end at the bottom. Traduire le commentaire en franais. Mikuni VM15 and VM18 carburetors. 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. Available at Brennys Motorcycle Clinic in Bettendorf, Ia. Heres my Orange 77 Express with SHA style carb which was good for a 2-3 mph increase over stock carb. Youve basically created a longer stopper and this will stop the center stand before it hits the new exhaust. In 2018, MLM introduced the MLM yamaha QT50 techno EDM circuit pipe. If it passes all the tests above, is in mint condition, and has title, I wouldnt pay more than $650. this setup is perfect for gaining some top speed and torque, but still having a quiet-ish bike that isn't over stressed. Yamaha PW50 rear gears. Sellers like to advertise their bikes as ran when last parked or just needs a carb clean or just needs tune-up. Or fastest delivery Jan 20 - 24 . I was bummin' that my 83 QT50 would bog out at 25mph. Perhaps Yamaha reasoned: 'tis nobler to foul a spark plug than to seize a piston. Day 3 I put a bigger pilot jet in the blue Qt. Eliminate your oil pump and just use pre-mixed gas/oil at a specific ratio (50:1 or so); We are ready to rock as soon as the weather cooperates. If the bike doesnt run dont pay more than $150; The Jog CDI is purported to retard timing at higher rpms and thus lead to lower operating temperatures. I talk about this above. 1. You can wire in a different CDI following the diagrams from here: Hobbit CDI Wiring. 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. 41.6mph. What you are really experiencing is the engine four stroking as a result of too much fuel in the combustion chamber. 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. Future topics to be covered: 6. Damn that was sweet! 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. Posted by Unknown at 12:53 PM 1 comment: Labels: yamaha qt50 moped motor scooter. Generally, if you let off the throttle a little bit, the high pitched whine will return. A carb cleaning will be necessary. 7. 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). A 69 jet seems better for that Orange Express. My Yamaha QT50 . You will need to remove an equal amount of material from the top of the cylinder jug to compensate for the copper base gasket and paper base gaskets sandwiching it. Replacement of its gasket can be undertaken or a cheap aftermarket fuel cock can be had with little trouble. 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. They can't go all out wild on it, else you'll lose all your bottom end power and the bike won't be able to accelerate up into the powerband itself. Most of the parts for the QT50 are still available from Yamaha dealers. Truth is it is getting too much gas and dying as a result. Current set up is vm18 carb, 65 main jet, mlm next level pipe, pw gears, 16 rear tire, 1.0mm spacer. A combination of the above. 1979 Yamaha qt50 speed run - YouTube AboutPressCopyrightContact usCreatorsAdvertiseDevelopersTermsPrivacyPolicy & SafetyHow YouTube worksTest new features 2022 Google LLC I treat all these as non-runners. -DO NOT CONTACT ME. A bigger cylinder head would also help with cooling. A temperature gauge is mission critical to keeping your piston from soft seizing. Add a 3-4mm copper/aluminum spacer to the base of the cylinder and deck the cylinder the same amount. Cone mesh air filters of the 28-29mm variety are plentiful and cheap on eBay or amazon and equally effective. Used Ulysse Speedometer app for my Verizon Thunder. Is there anything else I need to do before installing/using it? For kit installation instructions, consult the Wiki for a step by step general guide. Perhaps around 10% bigger than stock. 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. 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. As above, a cheap aftermarket 6 volt flasher is easily attained. These bikes like most Japanese bikes of the time came with excellent finishes in both the paint and chrome, though the plastic parts on many of these have deteriorated over the years. Top speed without an extended full throttle run of 34-35. Air filter missing subtract $25-35. Check out the exterior of the carburetor. Because I opened up the reed block slightly, a 2.5 increase in jet size is significant. 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. On a large ride, I was able to keep up with the Puch's and Carabela's. A small diameter wire is an effective cleaning tool when attempting to clear the idle jet of whatever crud that has narrowed its passageway. Web designers, SEO consultants, etc. Ride, handling, braking and, to a small extent, top speed can be improved with them. Also check the foot pegs to see if they are bent. 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. Such puny gains are not going to satisfy your QT50 fanatic. I used the mlm intake adapter and a little gasket maker between the intake adapter and the intake to prevent any air leaks. I also have conventional 5W-20 and 5W-30 oil. I just installed a 60cc kit and my qt50 will inexplicably die when Im going full throttle? Day 6 I let her eat today. A larger carburetor may even be a better choice than the stock carburetor with a larger jet. My initial acceleration may be a bit slower with the bigger rear tire. If the turn signals fail to blink, the flasher relay has seen better days. 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. New bolts with some anti-seize compound are recommended. It still has the stock exhaust which may be a huge limiting factor. Or your crankshaft seals are bad and need replaced. You will also want the Malossi exhaust gasket. It appears to have a retarding curve as well." Thats an almost 2 mph increase by just changing the rear tire. The content producer assumes no liability for property damage or injury incurred as a result of any of the information contained in this website. Honda Express with tecno boss exhaust and 1.5mm cylinder spacing. What should you pay for (or sell) a Honda Express? I got a mid-top end pipe from DG that was made for the QT50. You can also get an idea as to its compression by using the kick start. Manufactured. I have 0W-20, straight 30W synthetic, synthetic transmission fluid. Half the package or less is plenty. A Q-tip cut in half and then placed in your drill is another handy tool for cleaning the seat. The Yamahopper has an approximate top speed of 30mph in stock form, and thus can be used for city driving. Shine the light into the gas tank and determine how rusty the inside of the tank is. Youd seize before you got to 40. Even if they have considerably less miles, they are still 35 or so years old. 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. Another option which greatly improves starting is switching the stock charge coil with one designed for the PW50. Install a free-flowing air filter; The original tire size on the qt50 is 2.25 wide by 14 in diameter. If it does not, your compression will suffer. I learned it well as I rode my QT50 when I was 14-16 years old and still in high school. Chances are your tires on your 35 or so year old qt50 are a mess. I believe that Yamaha used a lousy charge coil on all models. Best jetting for VM18 on this setup seems to be 20 idle jet and 80 main jet. Ron Peek / yamahauler. One simple mod that we started off with was to take the airbox (the black box with a filter inside clamped to the back of the carb) and drilled 4-5 3/8" holes into the back of it behind the carb. Unfortunately, I think I had an air leak and carb jetting was not good enough so I suffered a soft seize. Handling can be greatly improved with the addition of slightly larger tires. Call 563-359-7222. The oil pump, slide spring and junction box all provide tension to snap the throttle back after you let go. Headlight doesnt work subtract $45; Front tire was a bit wobbly at. Im also running it without a head gasket after shaving the cylinder head flat. Reducing four stroking through a smaller main jet, more free-flowing air filter or both might get you 1-2 mph more. One had an "S" shaped header and the other had a much straighter header. The oil pump is reputed to add excessive amounts of two stroke oil to the fuel. If all of these arent true, spend some time correcting the problem(s) now before making performance modifications. Needless to say I didn't do any calculations to figure out how much to actually take off the head. 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. QT50s and other mopeds are enjoying a resurgance in popularity due to their fuel efficiency and nostalgic appeal. Be nice to her. See if the side covers are still installed. Whats the trade off? Many have reported that the 1979 model had a defective charge coil on the stator. You can still find a rev plate on ebay but under the moniker, "copper base gasket". Ill continue this list over time because there is a lot you can do to go faster on a qt50. Stay tuned. At full throttle, the bad seals may let in so much air that it causes your bike to die. QT50 CDI options - The Yamaha Jog CDI can be used in lieu of the stock QT50 CDI. Install an MLM peoples sidebleed exhaust. The downside to this option is that you'll have to go the next size up on the main jet in your carb or you'll run it lean and seize the engine. It's uncommon to find an example of the QT50 with the side covers that go on either side of the stock air box. Chances are you still wont get a good idea of how rusty the tank is even by doing this. Trail Tech offers a 14mm gauge for $39 or so. Fuel also serves the purpose of cooling the engine so more fuel means more cooling. The QT50 and the Honda Express are similar in appearance. I probably have more if I dig around. QT50 Oil injection removal - An oil injector block off plug can be found if you choose to go to premixed fuel.
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