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. I treat all these as non-runners. Having fun on the Yamaha qt50 AboutPressCopyrightContact. Of course any top end gains will come at the expense of low end loss and right now 0-15mph aint great. Yamaha MJ50 Towny two-speed crankcase and right-side swingarm. On a large ride, I was able to keep up with the Puch's and Carabela's. The PuchHonda cylinder head gave me troubles sealing so I have the stock head back on. 99. 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. Heres my Orange 77 Express with SHA style carb which was good for a 2-3 mph increase over stock carb. Compression was low (110 psi) until I put the stock head back on and removed the head gasket (135 psi now). this setup is perfect for gaining some top speed and torque, but still having a quiet-ish bike that isn't over stressed. If I bump up to an IRC NC 77 tire, Im going to a 70/9014 tire. Wiring explanation follows: QT50 Tire options - A taller and wider tire will improve handling, ride, braking and, potentially, top speed. In sunshine red with some fresh updates. This leads to hacking into the wiring. Rusty tanks can also be cleaned up and made to work. Dont try that with those niche kits. Re: I got manuals for yall on the net for FREE. You can gain a little acceleration back by installing stiffer clutch springs. Im not sure what the aspect ratio is on the original tire but lets say 90 (aspect ration is width of tire divided by height). You can also get an idea as to its compression by using the kick start. At top speed and when the engine is under little load, you may hear the engine note change tone from a high pitched whine to a lower and rougher growl. Or fastest delivery Jan 20 - 24 . Consider it a $39 insurance policy. The Jog CDI has five wires as opposed to the QT50's four. Mlm next level pipe is not too impressive. 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. Day 1 49cc engine is on my blue qt50. In short, here's what I did to my QT50 to make it a little bit peppier. . JP. Ive had at least two qt50s with bald back tires. Day 1 - 49cc engine is on my blue qt50. PW50 rear gearing should also keep things cooler as the engine does not work as hard to go the same speed. Waiting on puch head to arrive. 9. 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. Makes me wonder how anyone could really go fast with a stock head. 10. Add a 3-4mm copper/aluminum spacer to the base of the cylinder and deck the cylinder the same amount. So it has a 67.5 main jet in it now but a 70 jet is way too rich. I thought the stock exhaust might help in this regard. When you do successfully extract them, replace them with new bolts of the correct size. The 50 in the name is derived from the 50cc engine displacement. Another option is to remove the plastic gear from the oil pump and re-install the gearless pump. 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! Web designers, SEO consultants, etc. I cleaned up the transfers on a Honda cylinder like the pic above. Theres a lot more flow now. Maybe sooner if you want to be more cautious. 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. Reply Tim Doll / barneyfife OP Jan 11, 2020 12:19AM Sorry about that ,missed one small detail $650 Reply Bob Naske / bobqt50 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. The next easiest thing that you can do is slap on an expansion chanber. 2. It has a 15.15 SHA clone carb and currently running a 75 main jet. #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. 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. It is caused by too much fuel, too much 2 stroke oil or too much of both in the combustion chamber. 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! Call 563-359-7222. Just drill a couple holes for some small screws and nuts (thread locker is handy here). I got manuals for yall on the net for FREE! Better a fouled spark plug than a seized piston, right? I was bummin' that my 83 QT50 would bog out at 25mph. 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. 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. Try a slightly smaller main jet; The temperature gauge will be your other. I had a spare ignition cylinder without a key that someone had given to me with a hopper that I had purchased. When you increase top speed, make sure to upgrade your brakes with new pads, new cables, lube old cables, etc. The QT50 has a sealed beam headlight. Focus on the system as a whole. A combination of the above. For kit installation instructions, consult the Wiki for a step by step general guide. 7. You may need to bump up to a 72.5 main jet with this filter. Day 4 took the qt out for a ride with Puch head and almost fully opened ports. 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. Engine failure is imminent. Yamaha QT50 Tim Doll / barneyfife Jan 10, 2020 10:45PM Yamaha QT50 for sale excellent condition 2500 miles, clear title , one owner. Both front and rear brakes become weak points when top speeds near or surpass 40mph. The original tire size on the qt50 is 2.25 wide by 14 in diameter. I imagine the rear fender would have to go with this tire and would the tire fit on the rim? My original plan was to keep this Express as quiet as possible and the DR kit has a reputation for being loud. The immediate goal is to break 40 and then shoot for 45 mph. If your finger is forced off, the bike may have decent compression. 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. 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. Future topics to be covered: 6. The VM18 will require MLM's intake designed for the VM18. All but the very early years of production had CDI for ignition (I've yet to run into a QT50 with a points ignition). Youll think your qt is not getting enough gas because it stalls. Keep this principle in mind. Does the owner have title? Ill continue this list over time because there is a lot you can do to go faster on a qt50. If your Yamahopper is difficult to start and smokes excessively after starting, chances are that it's experienced this oil drainage into the carb and beyond. Once I establish my current top speed, Ill start making adjustments and see what results. I've got several other ideas but will reveal them one by one as I make progress from test to test. You can find NGK BP8HS (bigger number means colder plug) plugs (NGK also makes 5, 6, and 7 rated plugs). This part is used to reduce the degree of performance for your motorcycle, for yamaha. Best jetting for VM18 on this setup seems to be 20 idle jet and 80 main jet. "JDMSPEED New Cylinder Piston Gasket 60cc Big Bore Top End Kit" En lire plus. Unfortunately, its fairly common for people to lose the key. Most of the parts for the QT50 are still available from Yamaha dealers. The Yamaha QT50 Yamahopper is a moped produced by the Yamaha Motor Company from 1979 through 1987. You may also choose to richen up your jet needle by moving the clip down one or more positions. The stock main jet in a qt50 is a 70. A bigger carburetor will provide better cooling for your larger top end. Universal Rubber Sleeve by Motion Pro. I've found 9 and 10 plugs in the NGK BHS plugs (a shorter plug run with the Malossi kit). -DO NOT CONTACT ME. It has a high rpm retarding feature that keeps the temps down by retarding the ignition timing as the rpms increase. Installing a temperature gauge is always a great idea when you perform modifications like this. And cylinder got sanded down after 1.5mm of spacers added to open up all ports fully except intake at BDC. 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 think 2-4 mph is a bit optimistic. Also went down to 14 tire. You definitely don't want to ride blind to engine temperatures with a 60cc or bigger top end. If it goes slower than this, negotiate accordingly. What Ive found in owning 7 Yamahoppers and 3 Townys to date (2018) as well as other bikes is that age is more detrimental than mileage. Home. Expect a top speed gain of at least 10% over stock with this modification. When cleaning the carb, focus on the idle jet and the seat where the needle sits. This motorcycle, scooter or moped-related article is a stub. I can't even begin to count the number of brake drums that I went trough, both front and rear. Of course, this makes me wonder if I can use an IRC NC 77 80/9014 tire. yamaha . 2/1/16 Ok, just did a base speed test and hit 29.4 mph. Half the package or less is plenty. Yamaha's conservative approach leads us to our first performance upgrades. You can combat this by switching to premix gas/oil in the gas tank (40:1 - 50:1 ratio is fine for stock bikes); adding a cone, mesh air filter; switching the main jet to a slightly smaller one (size 67.5); or combination thereof. Day 3 I put a bigger pilot jet in the blue Qt. Im still undecided on what weight synthetic oil to try. Many mistake the low, rough growl as a result of a rev limiter residing in the CDI unit or perhaps elsewhere. Didnt have gps on today. Stay tuned. Many attribute this wall to some sort of rev limiter. Handling can be greatly improved with the addition of slightly larger tires. A 69 jet seems better for that Orange Express. Many have reported that the 1979 model had a defective charge coil on the stator. Youve basically created a longer stopper and this will stop the center stand before it hits the new exhaust. Performance modifications will only exaggerate current issues. My Yamaha QT50 Saturday, February 7, 2009. A 67.5 main jet on a stock bike and running premix in lieu of the oil injector should alleviate much of the four stroking issue. Want to post in this forum? Noped Thursday 2.03K subscribers Subscribe 3.7K views 4 years ago Some further tweaks yet but 49.1 mph. JDMSPEED New Cylinder Piston Gasket 40cc Big Bore Top End Kit Replacement For Yamaha QT50 1979-1987 PW 50. A 28 or 29mm air filter will fit on the stock Mikuni VM12 carburetor. 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). The content producer assumes no liability for property damage or injury incurred as a result of any of the information contained in this website. Call 563-359-7222. No side covers and you really want them subtract $100-125; Web designers, SEO consultants, etc. If the bike does run, take it for a test ride. 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. No title subtract $150-$250 (although you can register and get plates through Vermont so lack of title may not be so important or you may be in a state that doesnt require title); So the caveat here is just because it runs and rides well doesnt mean you are home free. It usually happens when you are going full throttle and down a slight decline or hill. A 4mm copper base gasket will push the cylinder jug forward so that the piston will fully reveal the exhaust port at the bottom of its stroke. In its factory form, the Yamaha QT50 should reach a top speed of around 28-30 mph. QT50s were popular in the late 1970s and 1980s because of their ease of use and maintenance, extremely low gas mileage, and legality in most U.S. states among pre-driving-age teenagers. I used a 65 main jet and it seems to be pretty dialed in. 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. You can help Wikipedia by expanding it. 1. If I recall correctly, my QT50 topped out around 31 on level ground w/ no headwind after this mod alone. 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. A popular choice is the IRC NR-77 moped tire: 14 x 70/90. 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. 1. Needs both tires subtract $95-105; Thats an almost 2 mph increase by just changing the rear tire. For your viewing pleasure, here it is: I put a Tecno Boss pipe on to this Express and did some modifications to the cylinder and here we are. (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!!)
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