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. Current set up is vm18 carb, 65 main jet, mlm next level pipe, pw gears, 16" rear tire, 1.0mm spacer. 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. The rear brakes tend to be weak on this bike. MLM makes a performance exhaust for the QT50, the MLM Yamaha QT50 People's Sidebleed Pipe. Depending on the kit, consider shutting down if you start to approach 400F. Turn signals and mirrors are also casualties of past wrecks. Puch head arrives Monday. $44.99 $ 44. 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. No such rev limiter exists. Day 1 49cc engine is on my blue qt50. 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. These are usually the first things that are misplaced. clutch yamaha qt50 hand yamaha pw50 yamaha mt 15 singapore pee wee yamaha pw50 yamaha qt50 wiring diagram yamaha qt50 top speed. What should you pay for (or sell) a Honda Express? -DO NOT CONTACT ME. Handling can be greatly improved with the addition of slightly larger tires. 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. 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. 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. 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. 9. Will change jet and try again. Mikuni VM15 and VM18 carburetors. 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. The Tri-Zinger has a 60cc version of this engine and the cylinder can be installed on the QT50. Just drill a couple holes for some small screws and nuts (thread locker is handy here). This cut down on the brake bill dramatically. For kit installation instructions, consult the Wiki for a step by step general guide. I will post a better video when its not so windy. 4. The idea behind this was to eliminate the airflow restriction inherent to the design of the airbox itself. 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. 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. Several methods are outlined here at mopedarmy.com. 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. Just like too much gas, too much oil can cause the engine to four stroke. The other 2 wires are power for lights or battery. 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. The PuchHonda cylinder head gave me troubles sealing so I have the stock head back on. I talk about this above. If I bump up to an IRC NC 77 tire, Im going to a 70/9014 tire. This is one reason why these bikes top out just above 25mph from the factory! 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. I just bought an MLM peoples sidebleed pipe for my QT50/MJ50. A popular choice is the IRC NR-77 moped tire: 14 x 70/90. See if the side covers are still installed. 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. (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!!) 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). 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. A 28 or 29mm air filter will fit on the stock Mikuni VM12 carburetor. I also have conventional 5W-20 and 5W-30 oil. Shine the light into the gas tank and determine how rusty the inside of the tank is. So, in essence, it would be getting too little fuel. I treat all these as non-runners. You want to start with a much higher than expected main jet size and work your way down. Ill put the circuit pipe on next and we should jump to over 40. What you are really experiencing is the engine four stroking as a result of too much fuel in the combustion chamber. Chances are you still wont get a good idea of how rusty the tank is even by doing this. One had an "S" shaped header and the other had a much straighter header. Also went down to 14 tire. Kenda also makes a number of 60/100 x 14" dirt tires that may work as well. Stock plug is an NGK BP4HS. 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. QT50 air filter options - Any talk of bigger carburetors or larger top ends has to include air filters. A larger carburetor may even be a better choice than the stock carburetor with a larger jet. A small diameter wire is an effective cleaning tool when attempting to clear the idle jet of whatever crud that has narrowed its passageway. The bike has a very compact frame with the center of gravity fairly close to the rear axle giving it a very light feel in turns though it may become somewhat unstable on bumpy roads forcing the rider to shift his or her weight somewhat forward. 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. 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. This page was last edited on 13 January 2018, at 17:44. Such puny gains are not going to satisfy your QT50 fanatic. 10. Yamaha MJ50 Towny two-speed crankcase and right-side swingarm. Controlling the heat produced by a bigger top end and/or a performance exhaust is a common issue with QT50s. Now imagine what happens when you put these holes in the back of the airbox. Most of these bikes are around 40 years old. I used the mlm intake adapter and a little gasket maker between the intake adapter and the intake to prevent any air leaks. Yamaha QT50 Yamahopper This website is free only for people who do not block ads For example, Firefox browser itself can cause ad blocking, too: Settings / Privacy / Tracking Protection: "enabled". If it doesnt pass all the tests above, subtract as follows: Very rusty gas tank requiring replacement $80-100 deduction; Worth it? The engine is smooth running, reliable, and long lived when proper maintenance is observed. Check the header on your exhaust and determine whether it is an "S" shape between the flange and silencer or more of a straight shot between the two. Qt50s will sell for less in the fall and winter. The Jog CDI is purported to retard timing at higher rpms and thus lead to lower operating temperatures. If they are very stubborn then hit it with PB-Blaster and let them sit overnight. Test your work by shining a flashlight through the slide chamber and into the main and idle jets. If it is a complete mess, chances are the inside isnt much better. Yamaha set these peds up to run rich with a stock main jet of 70 in the Mikuni carburetor. Web designers, SEO consultants, etc. Stock main jet size in the QT50 is a 70. South of the gas tank is the resting place of the qt's petcock. Motion Pro Rubber Sleeve (11-0045) 0 # mpn4565891373. I also went to a BP4HS plug and ditched the colder BP6HS plug. 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. 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. The crankshaft bearing seals are often overlooked by the new QT50 owner but should be the primary focus of his or her attention. When you do successfully extract them, replace them with new bolts of the correct size. Damn that was sweet! Having fun on the Yamaha qt50 AboutPressCopyrightContact. Install a bigger top end kit or modify your stock cylinder. Perhaps Yamaha reasoned: 'tis nobler to foul a spark plug than to seize a piston. We are ready to rock as soon as the weather cooperates. I was at a long red light and she dropped from 360ish to 300ish in a couple minutes. Didnt have gps on today. Yamaha may have intended that the bike run rich to promote engine life. 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. This does not mean that all four stroking is bad. Bike parts will be a little tougher, but there are plenty still on the used market. I imagine the rear fender would have to go with this tire and would the tire fit on the rim? I have 0W-20, straight 30W synthetic, synthetic transmission fluid. 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. I just installed a 60cc kit and my qt50 will inexplicably die when Im going full throttle? 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. Of course, this would retard the timing at all rpms and may not be ideal. 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. Most of the parts for the QT50 are still available from Yamaha dealers. I notice sometimes at full throttle it will run rougher, make a different noise, seem to hesitate and check up. This top-grade product is expertly made in compliance with stringent industry standards to offer a fusion of a well-balanced design and high level of craftsmanship. Im looking at a QT50 that Im thinking about buying. If the bike doesnt run dont pay more than $150; Commentaire fait aux tats-Unis le 10 novembre 2019. It also leads to using a key other than the Yamahopper one. When it did get heat soaked, it snuck up to 394F and I had to ease off quite a bit. It has a high rpm retarding feature that keeps the temps down by retarding the ignition timing as the rpms increase. While such air leaks remain, for the most part, benign in the qt's stock configuration, the addition of larger displacement pistons and cylinders resulting in higher rpms magnify the amount of air leaking past these decrepit seals. Another culprit in QT50 excessive four stroking is the oil pump. 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. New and used parts are often found on eBay as well. So I can compare temps between stock head and puch head. This filter will allow the engine to get more air. . Front tire was a bit wobbly at. Eliminate your oil pump and just use pre-mixed gas/oil at a specific ratio (50:1 or so); Available at Brennys Motorcycle Clinic in Bettendorf, Ia. After the main jet, dial in the jet needle. Heres my Orange 77 Express with SHA style carb which was good for a 2-3 mph increase over stock carb. Next, hold a finger over the spark plug hole and have a friend kick start the bike. 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. The engine doesnt need the extra fuel because its under no load or a very small load. Install a new and bigger rear tire. Youll think your qt is not getting enough gas because it stalls. I just bought an MLM peoples sidebleed pipe for my QT50/MJ50. Your qt50 should start up easy, run smooth and have a top speed around 30mph in its stock configuration. Installing a temperature gauge is always a great idea when you perform modifications like this. 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! . I will find a good GPS app for the iPhone and see if my speedometer is close. 6. In 2018, MLM introduced the MLM yamaha QT50 techno EDM circuit pipe. If you lose the oil pump, you also lose some of that snap-back tension. For every 1 mph below top speed of 30 mph, subtract $15-20; I might stick a performance exhaust on this next to see how it does. Ron Peek / yamahauler. If the bike pulls to one side while riding, it may have bent forks. A bigger cylinder head would also help with cooling. Thats an almost 2 mph increase by just changing the rear tire. Waiting on puch head to arrive. JP. 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. Reply. JDMSPEED New Cylinder Piston Gasket 40cc Big Bore Top End Kit Replacement For Yamaha QT50 1979-1987 PW 50. The K&N RC-2540 Universal Clamp-On Air Filter is a good but expensive choice. The QT50 has the main throttle cable leading to a throttle junction where it separates into two cables. The main jet should be your initial focus. 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. Keep this principle in mind. I got manuals for yall on the net for FREE! 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. 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. 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. The QT50 has a sealed beam headlight. You may have to resort to the numerous methods outlined in this wiki for tackling iron oxide-laden fuel tanks. 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. The Yamahopper has an approximate top speed of 30 mph in stock form, and thus can be used for city driving. The simplified driveshaft setup makes wheel changes easy. Rusty tanks can also be cleaned up and made to work. The Jog CDI has five wires as opposed to the QT50's four. Ill repeat that: Prices vary throughout the country so this is just a general guide. #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. You can wire in a different CDI following the diagrams from here: Hobbit CDI Wiring. 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. Yamaha QT50 Cables & Brackets. A 40 year old bike will need almost everything looked into. Now the air can flow in from the back of the airbox, straight through the filter and into the carb. I could do longer full throttle runs. It is a 2 stroke,. Try an 80 or 85 main jet. The header on my stock exhaust is kind of beat up so Im running a double exhaust gasket to seal it up. Heres a nice picture of the stock tire vs. the IRC tire. If you eliminate all four stroking, you may run the risk of seizing your piston. Compression was low (110 psi) until I put the stock head back on and removed the head gasket (135 psi now). Spring is always the hot season for noped and moped sales. Plastic parts may be the most difficult of all as they did not age well if left in the elements. 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). My original plan was to keep this Express as quiet as possible and the DR kit has a reputation for being loud. What a ride it was! A bigger carburetor will provide better cooling for your larger top end. Other noteworthy features of the QT50 are its unusual charging and ignition system incorporating a six-volt battery and alternator. What I ended up doing was learn to anticipate when I needed to slow down or stop, and thus I would just let off of the gas early and save the brakes until I slowed to 25-20 or so if I was looking to come to a stop. Day 6 I let her eat today. So my first top speed experiment will be to try a lighter weight synthetic oil to see if I obtain a noticeable 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. Be mindful of not completely eliminating all four stroking. The immediate goal is to break 40 and then shoot for 45 mph. 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. 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. Ill be interested to see the difference in head temps as compared to stock head. Heres a nice picture of the stock tire vs. the IRC tire. In sunshine red with some fresh updates. a video on this modification here at the bottom of this page. 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 is considered a motorcycle by most states. Tire width goes to 3.15 inches and top speed goes to 32.71 mph. What should you pay for (or sell) a Honda Express? Low end was miserable at 110 psi. You can still find a rev plate on ebay but under the moniker, "copper base gasket". 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). 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 . 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, using a key other than the Yamahopper one. #29-3208 | Yamaha QT50 (1979-1987) Front Brake Shoes Pk/2 Diameter: 79.3mm Width: 17mm OEM Ref # 27V-W2535-00 USD$ 5 .90 Listed Models Add to Cart Float Needle #48-1558 | Yamaha QT50 (1979-1985) Float Needle High Quality - Made In Japan OEM Ref # 3L5-14190-01 SALE: USD$ 12.00 (USD$ 19 .95) Add to Cart Universal Glas-Pak Insert #009-0317 As with any engine modification like this, you will need to install a larger main jet in the carburetor. 5,0 sur 5 toiles Works great. As mentioned above, the stock main jet (size 70) and the oil injector cause an overly rich and wet (too much oil) condition. Mlm next level pipe is not too impressive. And cylinder got sanded down after 1.5mm of spacers added to open up all ports fully except intake at BDC. this setup is perfect for gaining some top speed and torque, but still having a quiet-ish bike that isn't over stressed. 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. My Yamaha QT50 . "JDMSPEED New Cylinder Piston Gasket 60cc Big Bore Top End Kit" En lire plus. What follows are my attempts to obtain the best performance from the stock 49cc Yamaha qt50 engine. 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. 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. Trail Tech offers a 14mm gauge for $39 or so. 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. The VM18 will require MLM's intake designed for the VM18. My Yamaha QT50 Saturday, February 7, 2009. 3.8 out of 5 stars 64. 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. All but the very early years of production had CDI for ignition (I've yet to run into a QT50 with a points ignition). 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. I've got several other ideas but will reveal them one by one as I make progress from test to test. Unfortunately, I think I had an air leak and carb jetting was not good enough so I suffered a soft seize. In stock configuration, the QT50 will hit about 29-30 mph. They just need to make the cylinder "breathe" better at mid/high RPM. Im still breaking it in and have encountered and overcome several hurdles already. Yamaha Yamahopper qt50 top speed run, hang on! Took a ride with current setup as listed above. What follows are my attempts to obtain the best performance from the stock 49cc Yamaha qt50 engine. Rinse and repeat several times. 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 more than likely over-jetted. Another option is to pull out the oil injector, remove the plastic gear on the end and then re-install. Although unlikely that any significant difference exists, the straighter version contributed more to performance than the "S" shaped version. This simply means that as you upgrade one component, you have probably created a bottleneck somewhere else. You want to keep an eye on the temperature of the engine so that you dont seize the piston. A Q-tip cut in half and then placed in your drill is another handy tool for cleaning the seat. So the caveat here is just because it runs and rides well doesnt mean you are home free. To see our full inventory go to brennys dot com. 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. Im hoping an extra 25 psi helps out quite a bit. Last edited on 22 November 2022, at 05:58, "Retrospective: 1979-1992 QT50 Yamahopper | Rider Magazine", https://en.wikipedia.org/w/index.php?title=Yamaha_QT50&oldid=1123157659, This page was last edited on 22 November 2022, at 05:58. Ive added a video on this modification here at the bottom of this page. 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.). Re: RPM gauge for the Yamaha QT50. Best jetting for VM18 on this setup seems to be 20 idle jet and 80 main jet. Unfortunately, its fairly common for people to lose the key. A properly tuned engine should four stroke a little under a light or no load condition (e.g., going downhill). 1. I probably have more if I dig around. 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. Jan 09, 2023 08:37PM. Reply Tim Doll / barneyfife OP Jan 11, 2020 12:19AM Sorry about that ,missed one small detail $650 Reply Bob Naske / bobqt50 Available at Brennys Motorcycle Clinic in Bettendorf, Ia. 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 oil pump is reputed to add excessive amounts of two stroke oil to the fuel. Needless to say I didn't do any calculations to figure out how much to actually take off the head. Universal Rubber Sleeve by Motion Pro. 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. Yamaha qt50 jump to light speed - YouTube Ha ha ha.