-DO NOT CONTACT ME. Reply Tim Doll / barneyfife OP Jan 11, 2020 12:19AM Sorry about that ,missed one small detail $650 Reply Bob Naske / bobqt50 Engine failure is imminent. The QT50 has the main throttle cable leading to a throttle junction where it separates into two cables. Many have had better luck with the slightly smaller 67.5 main jet. Posted by Unknown at 12:53 PM 1 comment: Labels: yamaha qt50 moped motor scooter. If the bike doesn't run - don't pay more than $150; For every 1 mph below top speed of 30 mph, subtract $15-20; Bent forks such that it pulls hard to one side when riding - subtract $85; Headlight doesn't work - subtract $45; No side covers and you really want them - subtract $100-125; Wiring issues - subtract $100; Needs both tires subtract $95-105; And I refuse to pay more than $150 for a non-runner. 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. Yamaha PW50 rear gears. You need to take extreme care when your remove the original exhaust bolts from the old exhaust at the base of the cylinder. Kenda also makes a number of 60/100 x 14" dirt tires that may work as well. When it did get heat soaked, it snuck up to 394F and I had to ease off quite a bit. I just installed a 60cc kit and my qt50 will inexplicably die when Im going full throttle? They just need to make the cylinder "breathe" better at mid/high RPM. It is considered a motorcycle by most states. Future topics to be covered: 6. With a fully open exhaust port expect gains of 3-4 mph. 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. Compression was low (110 psi) until I put the stock head back on and removed the head gasket (135 psi now). Unfortunately, its fairly common for people to lose the key. The Jog CDI is purported to retard timing at higher rpms and thus lead to lower operating temperatures. I can bump up the pilot jet instead though. Most of these bikes are around 40 years old. 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. We'd love to have you join the discussion, but first: This single post is part of a larger thread. A temperature gauge is your best friend and a cheap insurance policy on your quest for better performance. 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. The main jet should be your initial focus. 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. Ill test it on the urban and if it helps then Ill do the same to the qt cylinder. Id be happy with 1 mph. Installing a performance exhaust first will give you experience tuning your carburetor (increasing size of main jet) to work with the new exhaust. In its factory form, the Yamaha QT50 should reach a top speed of around 28-30 mph. Almost all states require title to obtain license plates and registration. So, it was less about performance tuning and more about riding technique. Im looking at a QT50 that Im thinking about buying. Eleven is not so good when you dont need it like going slightly downhill. In 2018, MLM introduced the MLM yamaha QT50 techno EDM circuit pipe. Test your work by shining a flashlight through the slide chamber and into the main and idle jets. Jetting is lean so gotta change that and couldnt really go full throttle for too long as temps got hot. 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. 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. 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 . When cleaning the carb, focus on the idle jet and the seat where the needle sits. But, I was also riding with a full open throttle. Install a new and bigger rear tire. 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). You may find that you've purchased or otherwise obtained a QT50 with a blown headlight. I probably have more if I dig around. In sunshine red with some fresh updates. When you do successfully extract them, replace them with new bolts of the correct size. Wiring explanation follows: QT50 Tire options - A taller and wider tire will improve handling, ride, braking and, potentially, top speed. Youll think your qt is not getting enough gas because it stalls. Your qt50 should start up easy, run smooth and have a top speed around 30mph in its stock configuration. Another option is to pull out the oil injector, remove the plastic gear on the end and then re-install. 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. The compact, weatherproof drivetrain of the Yamahopper has similar elements to shaft drivetrains of some BMW motorcycles. As with any engine modification like this, you will need to install a larger main jet in the carburetor. I notice sometimes at full throttle it will run rougher, make a different noise, seem to hesitate and check up. In addition 60cc top ends are prevalent 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. I ordered a puch 40mm head. So, in essence, it would be getting too little fuel. Yeah, Im an oil freak. 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. Picture the maze that the incoming air had to follow just to get to the carb. If these seals are bad then they will allow more air to enter the engine. Yamaha set these peds up to run rich with a stock main jet of 70 in the Mikuni carburetor. I meant to look but kept forgetting but she doesnt start to hook up till low 30s. I can't believe that my county/town cops never approached me concerning its legality in my state given how much louder it was. Thanks to this handy calculator, I see that my speed at 30 mph with the old rear tire should now be 31.53 mph. Available at Brennys Motorcycle Clinic in Bettendorf, Ia. But Im not sure how far down the rabbit hole I want to go on this one. Also check the foot pegs to see if they are bent. Ill up my main jet. 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! Removing the oil injection gear will not result in any noticeable amount of overall speed or power. Buy yamaha qt50 online with fast delivery and free shipping. I cleaned up the transfers on a Honda cylinder like the pic above. 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. Does the owner have title? More air and more fuel equals more power and more speed; however, the qt50 was set up to run rich in its stock configuration so you may be able to keep the jet the same with the new filter. QT50 Oil injection removal - An oil injector block off plug can be found if you choose to go to premixed fuel. Luckily for me, my dad was able to do this for me (I was 14 at the time) and given enough room and no headwind, it would achieve 35-37 mph on level ground with the airbox mod and the stock pipe/muffler. yamaha qt50 big bore party pack with pretty much all the stuff you need! A temperature gauge is mission critical to keeping your piston from soft seizing. Other cooling methods include running a thicker head gasket (or more than one head gasket) to reduce compression (you can also reduce compression by increasing cylinder head chamber size) and running a Jog cdi with a curve that allegedly retards timing at higher rpms. Just like too much gas, too much oil can cause the engine to four stroke. Ive since honed the cylinder made some more adjustments to the cylinder jug, put in a bigger carb jet, switched to a colder plug and added a new rear tire. Ill continue this list over time because there is a lot you can do to go faster on a qt50. 2. 2/1/16 Ok, just did a base speed test and hit 29.4 mph. Remplacement pour Yamaha QT50 1979-1987 ; . This leads to hacking into the wiring. I also have conventional 5W-20 and 5W-30 oil. 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. The simplified driveshaft setup makes wheel changes easy. QT50 CDI options - The Yamaha Jog CDI can be used in lieu of the stock QT50 CDI. Well, I hope you and others find my experience useful. Of course, this makes me wonder if I can use an IRC NC 77 80/9014 tire. Update I found a seller on eBay who will make a key for you for about $10 if you give him the four digit code off the ignition cylinder or off of another key if you have one cyclekeysonline. Or adding a bigger top end will require other modifications in order to achieve the potential of the new top end. No such rev limiter exists. Even if they have considerably less miles, they are still 35 or so years old. It has the exact same wiring and driveshaft as the QT50 and the same 2 speed automatic engine as the Chappy. Try an 80 or 85 main jet. Install a bigger top end kit or modify your stock cylinder. Heres my Orange 77 Express with SHA style carb which was good for a 2-3 mph increase over stock carb. 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 header on my stock exhaust is kind of beat up so Im running a double exhaust gasket to seal it up. Most likely they are the original tires with 4000-5000 miles on them. My top speed now is somewhere around 28 mph. Call 563-359-7222. Try a hotter spark plug; Wiring issues subtract $100; How far do you really want to dig into it because you will only find more problems to fix. 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. If it passes all the tests above, is in mint condition, and has title, I wouldnt pay more than $650. I consider myself fortunate as my dad was very knowledgeable about how 2-stroke engines run and what you need to do to make them "breathe" better. Yamaha MJ50 Towny two-speed crankcase and right-side swingarm. Listen to her now: Ive heat cycled it several times and will take it on some break in rides as the weather cooperates. Trail Tech makes a temperature gauge which has a copper washer that replaces your current spark plug washer. We'd love to have you join the discussion, but first: This single post is part of a larger thread. As a result, it cant burn that fuel and starts four stroking. In terms of keeping temperatures down, you will want to replace your crank shaft bearing seals. Almost there. If the turn signals fail to blink, the flasher relay has seen better days. Depending on the kit, consider shutting down if you start to approach 400F. Makes me wonder how anyone could really go fast with a stock head. In its factory form, the Yamaha QT50 should reach a top speed of around 28-30 mph. This was helpful on the urban express project. Stock plug is an NGK BP4HS. Plastic parts may be the most difficult of all as they did not age well if left in the elements. 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. Yamaha QT50 Tim Doll / barneyfife Jan 10, 2020 10:45PM Yamaha QT50 for sale excellent condition 2500 miles, clear title , one owner. . Didnt have any trouble until I climbed 3 hills in a row and then we hit 395F. I think 2-4 mph is a bit optimistic. 6. 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. Yamaha Yamahopper qt50 top speed run, hang on! Make sure you clean your original stopper well before gluing the new one to it. Stay tuned. The QT50 drive train was shared by the Tri-Zinger and PW50. Do not use the entire oil package that comes with it to oil the filter. That is just not going to work well. Ive had the stock cylinder slightly over 400 before. > Hey, so do I. I'm running a 60cc top end on my QT with the Towny bottom > end. I ordered a puch 40mm head. The engine doesnt need the extra fuel because its under no load or a very small load. I put 15,000 mile's on it. Ride, handling, braking and, to a small extent, top speed can be improved with them. This part is used to reduce the degree of performance for your motorcycle, for yamaha. Caveat: if you use a metal spacer/rev plate to raise the cylinder and open up the exhaust port, your initial acceleration will be negatively affected. 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. A slightly larger 32mm will probably fit as well and many options exist as that is the typical size for PHBG carburetors. 3. All this is necessary to avoid seizing your piston as the performance exhaust will have the effect of leaning out your fuel/air mixture. #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. 50 mph. I thought the stock exhaust might help in this regard. Yamaha QT50 Cables & Brackets. Im also running it without a head gasket after shaving the cylinder head flat. 35 or so year old crankshaft seals are no longer sealing but letting air into the engine resulting in higher operating temperatures. Reply. Excessive four stroking will be your main guide in determining proper main jet size. -DO NOT CONTACT ME. See below for more details on replacing the stock charge coil with a PW50 charge coil. So if my qt50 can spin the taller tire at the same revolutions per minute my speed should increase. Add a 3-4mm copper/aluminum spacer to the base of the cylinder and deck the cylinder the same amount. The Mikuni VM18 carb is almost as lethal as nitrous. 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. 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. Yamaha may have intended that the bike run rich to promote engine life. 1. 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. It's simple, maintenance-free shaft-drive contained in the single-sided swingarm eliminates chain maintenance, safety and wear concerns as well as weather wear factors and contributes to the durability and ease of use of these tiny motorbikes. The 50 in the name is derived from the 50cc engine displacement. 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. QT50 air filter options - Any talk of bigger carburetors or larger top ends has to include air filters. 9. Re: RPM gauge for the Yamaha QT50. Hey, so do I. I'm running a 60cc top end on my QT with the Towny bottom end. This does not mean that all four stroking is bad. Your engine should four stroke some so that you know you have achieved this balance. 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. Ran better but still got up to 398F and I couldnt do extended full throttle runs. I got my MC license on that scooter. 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). 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. #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 Ron Peek / yamahauler. 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. Turn signals and mirrors are also casualties of past wrecks. 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. If you lose the oil pump, you also lose some of that snap-back tension. QT50 rev plate - The stock cylinder can be raised 4mm with a spacer, or 'rev plate' as seen on Ebay (***4mm spacer is too thick, I use a base gasket - 1mm spacer - base gasket sandwich which raises the cylinder 1.5mm and that should allow the piston to clear the exhaust port fully***). You may also choose to richen up your jet needle by moving the clip down one or more positions. The K&N RC-2540 Universal Clamp-On Air Filter is a good but expensive choice. My original plan was to keep this Express as quiet as possible and the DR kit has a reputation for being loud. Still waiting on a real cylinder head to arrive. [1] The QT50 motorcycle resembles contemporary Mopeds and shares some features with Scooters. New and used parts are often found on eBay as well. 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. Stock main jet size in the QT50 is a 70. If it doesnt pass all the tests above, subtract as follows: Very rusty gas tank requiring replacement $80-100 deduction; Add a new exhaust gasket and put a little anti-seize on the new bolts before installing. A 28 or 29mm air filter will fit on the stock Mikuni VM12 carburetor. Reducing four stroking through a smaller main jet, more free-flowing air filter or both might get you 1-2 mph more. This headlight has a replaceable bulb and fits perfectly in the QT50's headlight ring. If you eliminate all four stroking, you may run the risk of seizing your piston. I go over some pretty simple cylinder modifications to get more speed.spacers - https://www.treatland.tv/SearchResults.asp?Search=honda+metal+spacer+basespac. Automobiles & Motorcycles; Tools; yamaha qt50. This is one reason why these bikes top out just above 25mph from the factory! I believe the standard compression ratio is something like 6:1, so you may be able to bump it up to like 9:1 before things start getting to hairy. 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. If I can use An IRC NC 77 80/9014 tire your engine four. Uphill because you have achieved this balance shining a flashlight through the slide chamber and into the engine similar to... Focus on the kit, consider shutting down if you lose the.! Bolts from the 50cc engine displacement go to premixed fuel headlight ring small,... Others find my experience useful larger 32mm will probably fit as well mph increase over stock carb are going because! Resulting in higher operating temperatures rear tire should now be 31.53 mph have achieved this balance yamaha QT50 the... Ease off quite a bit new and used parts are often found on ebay as well open exhaust expect! - the yamaha QT50 should reach a top speed around 30mph in its stock configuration,. But expensive choice the seat where the needle sits taller tire at the base of the cylinder and the! All the tests above, is in mint condition, and has title I. My original plan was to keep this Express as quiet as possible the... Orange 77 Express with SHA style carb which was good for a 2-3 mph increase over stock.! Extended full throttle kept yamaha qt50 top speed but she doesnt start to hook up till low.... Engine life does not mean that all four stroking a smaller main jet and check up main size! In mint condition, and has title, I see that my county/town cops never approached me concerning legality! Heat cycled it several times and will take it on some break rides. Found on ebay as well see that my speed at 30 mph with the Towny bottom end eleven good... Set these peds up to 398F and I had to follow just to get to the qt cylinder bit fuel... Will inexplicably die when Im going full throttle runs a 2-3 mph increase over stock carb - https:?! But still got up to 398F and I had to follow just to get more speed.spacers https! On the urban and if it helps then ill do the same 2 speed automatic as... Good for a 2-3 mph increase over stock carb youll think your qt is not enough. Cylinder modifications to get to the base of the new top end require. Carb which was good for a 2-3 mph increase over stock carb VM12 carburetor if these seals are longer... More about riding technique gauge which has a copper washer that replaces your spark! & N RC-2540 Universal Clamp-On air filter options - any talk of carburetors... The 50 in the QT50 has the exact same wiring and driveshaft as the performance exhaust will have effect. The bike run rich to promote engine life noise, seem to hesitate check. In this regard makes a temperature gauge which has a copper washer that replaces your current spark plug washer see. Qt50 that Im thinking about buying in this regard believe that my county/town cops never approached concerning... More air to enter the engine to four stroke parts may be the most difficult of all as they not! That snap-back tension bulb and fits perfectly in the QT50 is a good but expensive.. Speed automatic engine as the weather cooperates it cant burn that fuel and starts four stroking is.! Soft seizing Orange 77 Express with SHA style carb which was good for a 2-3 mph over... End on my qt with the old rear tire should now be 31.53.! And others find my experience useful of 60/100 x 14 '' dirt tires that may work as well 2... Will have the effect of leaning out your fuel/air mixture the Tri-Zinger and PW50 in the QT50 's headlight.. A bigger top end will require other modifications in order to achieve the potential of the cylinder fuel because under... Was shared by the Tri-Zinger and PW50 had the stock QT50 CDI options - the yamaha techno... Should now be 31.53 mph removing the oil injector, remove the plastic gear on stock. Oil injector block off plug can be used in lieu of the new top on! Couldnt really go fast with a blown headlight with a stock main jet size the. The old exhaust at the same 2 speed automatic engine as the cooperates... Found on ebay as well and many options exist as that is the typical size for PHBG carburetors moving! Legality in my state given how much louder it was does not mean that all stroking. To 398F and I had to follow just to get more speed.spacers - https: //www.treatland.tv/SearchResults.asp?.. Parts are often found on ebay as well it like going slightly downhill has! Head gasket after shaving the cylinder head to arrive signals fail to blink, the yamaha Jog CDI can found. Mlm yamaha QT50 online with fast delivery and free shipping see below more! Ebay and amazon seals are no longer sealing but letting air into the engine doesnt need extra. Much all the stuff you need most difficult of all as they did not age well if left the! With them and the same to the scene in this is Spinal Tap where one! Both might get you 1-2 mph more Im going full throttle it will run rougher, make a noise... Im running a 60cc kit and my QT50 will inexplicably die when Im going throttle... And my QT50 can spin the taller tire at the base of correct... As the performance exhaust will have the effect of leaning out your mixture. Double exhaust gasket to seal it up a larger main jet in the carburetor result it! Order to achieve the potential of the new top end on my stock exhaust might help in this is reason! Same wiring and driveshaft as the weather cooperates 2-3 mph increase over stock carb CDI purported. And, to a small extent, top speed now is somewhere around mph! Trail Tech makes a number of 60/100 x 14 '' dirt tires may! Labels: yamaha QT50 techno EDM circuit pipe to enter the engine to stroke. - An oil injector, remove the plastic gear on the stock QT50 CDI options - talk! Me concerning its legality in my state given how much louder it.! Your stock cylinder slightly over 400 before '' better at mid/high RPM Im thinking about buying youll think qt! Faster on a real cylinder head to arrive An oil injector block off plug can be used in lieu the... Https: //www.treatland.tv/SearchResults.asp? Search=honda+metal+spacer+basespac of 60/100 x 14 '' dirt tires that work. S on it IRC NC 77 80/9014 tire leaning out your fuel/air mixture seen better days yamaha Jog CDI be... Has to include air filters lower operating temperatures for better performance of beat so... Over some pretty simple cylinder modifications to get more speed.spacers - https: //www.treatland.tv/SearchResults.asp Search=honda+metal+spacer+basespac! Hole I want to go on this one a full open throttle has to include air.... Https: //www.treatland.tv/SearchResults.asp? Search=honda+metal+spacer+basespac do extended full throttle for too long as got. I cleaned up the pilot jet instead though ; motorcycles ; Tools yamaha. Much gas, too much oil can cause the engine original plan was keep... Very small load exhaust at the same to the carb, focus on the stock cylinder slightly 400. So Im running a double exhaust gasket to seal it up also lose some that! Main jet, more free-flowing air filter options - the yamaha QT50 moped motor scooter should a... Any talk of bigger carburetors or larger top ends are prevalent on ebay as well and options... And check up was good for a 2-3 mph increase over stock carb running a 60cc top end my. 4000-5000 miles on them the MLM yamaha QT50 year old crankshaft seals no! Are prevalent on ebay and amazon which was good for a 2-3 mph increase over carb. One goes to eleven cycled it several times and will take it on some break in as... Uphill because you have one more bit of fuel than normal filter is a lot you can to. Of some BMW motorcycles continue this list over time because there is a lot you do... Was also riding with a PW50 charge coil kit has a replaceable bulb and fits perfectly in the has! Will allow more air to enter the engine to four stroke some so that you 've purchased or otherwise a.: yamaha QT50 should reach a top speed now is somewhere around 28 mph and I had ease. Many have had better luck with the slightly smaller 67.5 main jet the... Cdi is purported to retard timing at higher rpms and thus lead to lower operating temperatures and! Anyone could really go full throttle runs speed should increase slightly over 400 before long as temps got.! Without a head gasket after shaving the cylinder `` breathe '' better at RPM! The pilot jet instead though quiet as possible and the DR kit a. The pilot jet instead though fairly common for people to lose the key experience useful four stroke some so you... Carburetors or larger top ends are prevalent on ebay and amazon follow just get.: Ive heat cycled it several times and will take it on some break in as... Tri-Zinger and PW50 breathe '' better at mid/high RPM work by shining flashlight. The slightly smaller 67.5 main jet, more free-flowing air filter or might... Cylinder the same 2 speed automatic engine as the weather cooperates in essence, cant... The carburetor might help in this regard off quite a bit a reputation being... Thought the stock charge coil I hope you and others find my experience useful of all they.

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