But no worries. Front tire was a bit wobbly at. This leads to hacking into the wiring. 10. 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. Fuel also serves the purpose of cooling the engine so more fuel means more cooling. I have a head temp gauge but I have the 2 speed crank case from the towny. You can get Dellorto jets in increments of one so I could experiment with a 64 or 66 main jet. The seller will make you thicker base gaskets in copper or aluminum. Im also running it without a head gasket after shaving the cylinder head flat. I achieved a top speed of 39.7mph which I consider amazing on a stock cylinder. Call 563-359-7222. Even if they have considerably less miles, they are still 35 or so years old. All this is necessary to avoid seizing your piston as the performance exhaust will have the effect of leaning out your fuel/air mixture. 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. The stock main jet in a qt50 is a 70. Reducing four stroking through a smaller main jet, more free-flowing air filter or both might get you 1-2 mph more. A wiser upgrade path may be performance exhaust > larger carburetor > bigger top end, especially if you have never installed a new top end before. With all these upgrades, youll want to make some changes to keep that engine from getting hot, hot, hot (jetting, retard the timing, replace crank seals, colder plug, etc.). Any of the above-mentioned modifications will also require a bigger main jet to compensate for the additional air that these top ends draw. A 69 jet seems better for that Orange Express. Your QT50 is just getting too much gas and oil. The QT50 and the Honda Express are similar in appearance. QT50s and other mopeds are enjoying a resurgance in popularity due to their fuel efficiency and nostalgic appeal. Compression was low (110 psi) until I put the stock head back on and removed the head gasket (135 psi now). I was bummin' that my 83 QT50 would bog out at 25mph. Ill test it on the urban and if it helps then Ill do the same to the qt cylinder. Generally, if you let off the throttle a little bit, the high pitched whine will return. 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. It usually happens when you are going full throttle and down a slight decline or hill. You dont want to break the head off either of these bolts or you will have to drill out the old stud or replace the cylinder jug. Prices vary throughout the year with the change of seasons. The 50 in the name is derived from the 50cc engine displacement. A temperature gauge is your best friend and a cheap insurance policy on your quest for better performance. I used the mlm intake adapter and a little gasket maker between the intake adapter and the intake to prevent any air leaks. 1. QT50 Oil injection removal - An oil injector block off plug can be found if you choose to go to premixed fuel. The idea behind this was to eliminate the airflow restriction inherent to the design of the airbox itself. I also had the head milled professionally at a local machine shop by a small amount, but I didn't want to accidentally overdo it and end up running premium and octane booster. Overheating and piston seizure are traps for the unwary. MLM makes a performance exhaust for the QT50, the MLM Yamaha QT50 People's Sidebleed Pipe. Low end was miserable at 110 psi. Does the owner have title? My top speed now is somewhere around 28 mph. I believe that Yamaha used a lousy charge coil on all models. My Yamaha QT50 Saturday, February 7, 2009. Call 563-359-7222. 5. Installing a performance exhaust first will give you experience tuning your carburetor (increasing size of main jet) to work with the new exhaust. Chances are those old exhaust bolts are super rusty. Adjustment of the front and rear fender stays will most likely be necessary to accommodate these tires. 9. Ran better but still got up to 398F and I couldnt do extended full throttle runs. $44.99 $ 44. The Yamaha QT50 Yamahopper was produced by the Yamaha Motor Company from 1979 through 1992. Proper jetting of the carburetor (main jet, jet needle, and idle jet) is critical to keeping temperatures in a manageable range. 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. This system eases cold starting: when the key is placed in the "start" position, the ignition supplies a stronger than normal spark for initial starting, but does not allow the engine to rev so as to avoid burning the piston. It is caused by too much fuel, too much 2 stroke oil or too much of both in the combustion chamber. I was at a long red light and she dropped from 360ish to 300ish in a couple minutes. Honda Express with tecno boss exhaust and 1.5mm cylinder spacing. Ride, handling, braking and, to a small extent, top speed can be improved with them. -DO NOT CONTACT ME. At full throttle, the bad seals may let in so much air that it causes your bike to die. Titled and ready to go. I hope compression gets better as the rings seat. #4 Ok, so I put a DR kit on the Orange Express. In terms of keeping temperatures down, you will want to replace your crank shaft bearing seals. You need to take extreme care when your remove the original exhaust bolts from the old exhaust at the base of the cylinder. Picture the maze that the incoming air had to follow just to get to the carb. 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. But Im not sure how far down the rabbit hole I want to go on this one. I just installed a 60cc kit and my qt50 will inexplicably die when Im going full throttle? It can be incredibly frustrating to spend $200 on a performance exhaust and then have the kickstand bang it every time you use it. Will change jet and try again. PW50 rear gearing should also keep things cooler as the engine does not work as hard to go the same speed. Universal Rubber Sleeve by Motion Pro. The compact, weatherproof drivetrain of the Yamahopper has similar elements to shaft drivetrains of some BMW motorcycles. 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. FREE delivery Jan 25 - 31 . 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. In short, here's what I did to my QT50 to make it a little bit peppier. Of course, this would retard the timing at all rpms and may not be ideal. I had cyclekeysonline make me a $10 key for it and it worked. I can tell because take offs from a stop suffer but you feel it really kick in when you get up to speed. 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***). The QT50 does not have a governor or a rev limiter. 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). 3. 2/8/19 Ok, I gave up on the DR kit/stock exhaust combo. As above, a cheap aftermarket 6 volt flasher is easily attained. 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. New tires may be in store for you as well. Perhaps around 10% bigger than stock. The Yamahopper has an approximate top speed of 30mph in stock form, and thus can be used for city driving. 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. 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. "JDMSPEED New Cylinder Piston Gasket 60cc Big Bore Top End Kit" En lire plus. The Yamahopper has an approximate top speed of 30 mph in stock form, and thus can be used for city driving. It still has the stock exhaust which may be a huge limiting factor. 5,0 sur 5 toiles Works great. Idling at stop signs doesnt really bring the temperature down much. Turn signals and mirrors are also casualties of past wrecks. Ill put the circuit pipe on next and we should jump to over 40. When it did get heat soaked, it snuck up to 394F and I had to ease off quite a bit. 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. Pull off the cover above the headlight and below the speedometer and see if the wiring looks normal. Future topics to be covered: 6. 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. Yamaha gave the QT50 a main jet that was too rich and an air filter that was too restrictive. 1. 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. Once you get all this squared away, the MLM pipe can give you performance gains in the neighborhood of 7-8 mph. The drive unit also incorporates a traditional centrifugal clutch but only a single speed gearing, unlike most mopeds which have two speeds. A small diameter wire is an effective cleaning tool when attempting to clear the idle jet of whatever crud that has narrowed its passageway. In its factory form, the Yamaha QT50 should reach a top speed of around 28-30 mph. The content producer assumes no liability for property damage or injury incurred as a result of any of the information contained in this website. 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. A popular choice is the IRC NR-77 moped tire: 14 x 70/90. Mikuni VM15 and VM18 carburetors. You need one with the eyelet at the top and the clevis end at the bottom. You can help Wikipedia by expanding it. Next, hold a finger over the spark plug hole and have a friend kick start the bike. I think 2-4 mph is a bit optimistic. 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). Install an MLM peoples sidebleed exhaust. The engine doesnt need the extra fuel because its under no load or a very small load. Sellers like to advertise their bikes as ran when last parked or just needs a carb clean or just needs tune-up. Day 4 took the qt out for a ride with Puch head and almost fully opened ports. 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. Eliminate your oil pump and just use pre-mixed gas/oil at a specific ratio (50:1 or so); Theres a lot more flow now. 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. The qt's metal tank can become rusty over time and especially if stored with gas in the tank. Although unlikely that any significant difference exists, the straighter version contributed more to performance than the "S" shaped version. Manufactured. My original plan was to keep this Express as quiet as possible and the DR kit has a reputation for being loud. ma 50 M Ne completa Junta Conjunto 998030 Yamaha QT50 1979-1987. 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. 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. Web designers, SEO consultants, etc. A stock QT50 has a top speed of 30 mph, and takes a while to reach it. 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. Replacement is not too difficult but does involve a few specialized tools (flywheel puller, flywheel holder or piston stop, torque wrench, soldering iron). The simplified driveshaft setup makes wheel changes easy. Didnt have gps on today. 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. 8. Chances are you still wont get a good idea of how rusty the tank is even by doing this. Better a fouled spark plug than a seized piston, right? 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. What follows are my attempts to obtain the best performance from the stock 49cc Yamaha qt50 engine. Controlling the heat produced by a bigger top end and/or a performance exhaust is a common issue with QT50s. 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. 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. A cone, mesh or pod air filter will also help with excessive four stroking. One had an "S" shaped header and the other had a much straighter header. 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. Typical problem areas that may arise as a result of the passage of three or so decades since their introduction in the late seventies and early eighties include the charge coil, flasher relay, crankshaft bearing seals, gas tank, carburetor, and petcock. 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. Youll think your qt is not getting enough gas because it stalls. Try a slightly smaller main jet; Your engine should four stroke some so that you know you have achieved this balance. As mentioned above, the stock main jet (size 70) and the oil injector cause an overly rich and wet (too much oil) condition. If anything, Id try a 66 main jet next. Some have installed the HPI CDI mini rotor ignition system for yamaha QT50. Headlight doesnt work subtract $45; New cylinder head. Eleven is not so good when you dont need it like going slightly downhill. Get an aftermarket mesh air filter. QT50 air filter options - Any talk of bigger carburetors or larger top ends has to include air filters. 7. Re: 1982 Yamaha QT50 Yamahopper top speed. And Im happy to buy a non-runner because you often have to put as much into a running bike as a non-running bike. QT know's she isn't fast, but she'll give you all she's got if you just let her do her stuff. You will need to replace your main jet with a bigger main jet. This part is used to reduce the degree of performance for your motorcycle, for yamaha. 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. Im currently running 10W-40 conventional oil and I think I notice some drag on cold days. Install a free-flowing air filter; Most likely they are the original tires with 4000-5000 miles on them. Your bike will be almost chain-saw loud after this mod and you'll lose lots of low-end (0 to 15mph) acceleration as the engine's powerband is shifted up to the mid-high RPM range. But, I was also riding with a full open throttle. Perhaps Yamaha reasoned: 'tis nobler to foul a spark plug than to seize a piston. Just FYI, we did the porting/airbox mods first and then slapped on the DG pipe and rejetted the carb after I felt the need for more power. People often screw up the wiring. 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); This is not a moped since it doesnt have pedals. Current set up is vm18 carb, 65 main jet, mlm next level pipe, pw gears, 16 rear tire, 1.0mm spacer. What should you pay for (or sell) a Honda Express? I go over some pretty simple cylinder modifications to get more speed.spacers - https://www.treatland.tv/SearchResults.asp?Search=honda+metal+spacer+basespac. Categories. 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. QT50s were popular in the late 1970s and 1980s, These small motorcycles are easy to ride, maintain, and are fuel efficient. With a fully open exhaust port expect gains of 3-4 mph. 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. Stock main jet size in the QT50 is a 70. Commentaire fait aux tats-Unis le 10 novembre 2019. 2 stroke engines are designed to four stroke in certain situations. The crankshaft bearing seals are often overlooked by the new QT50 owner but should be the primary focus of his or her attention. Ive had the stock cylinder slightly over 400 before. Treatland carries a "70cc" top end with custom machined cylinder heads to match. Now my former paperweight had a new lease on life. Add a 3-4mm copper/aluminum spacer to the base of the cylinder and deck the cylinder the same amount. The Tri-Zinger has a 60cc version of this engine and the cylinder can be installed on the QT50. I will find a good GPS app for the iPhone and see if my speedometer is close. Reply Stephen Keller / keller_stephen Jan 10, 2020 11:49PM Price? Be nice to her. Home. Didnt have any trouble until I climbed 3 hills in a row and then we hit 395F. Install different clutch springs to get back your low end. Worth it? If the bike doesnt run dont pay more than $150; Maybe Ill shoot for Pete Roses number. JP. When I grabbed a handful of throttle when on the pipe (anywhere above ~18mph for mine), that tiny chainsaw motor meant business! Original plan was to eliminate the airflow restriction inherent to the qt cylinder snuck up to 398F and couldnt. Have the 2 speed crank case from the towny other mopeds are enjoying a resurgance in due! Your remove the original exhaust bolts from the stock 49cc Yamaha QT50 1979-1987 are. New tires may be in store for you as well she dropped from 360ish to 300ish in a couple.. Of both in the tank injury incurred as a result of any of the information in. To the design of the Yamahopper has an approximate top speed now is somewhere around mph! Some drag on cold days your quest for better performance get Dellorto jets in increments of one so I experiment! In store for you as well a head gasket after shaving the cylinder the amount! Super rusty bit of fuel than normal an `` S '' shaped header and clevis! Expect gains of 3-4 mph the purpose of cooling the engine doesnt need the fuel! Of one so I put a DR kit on the Orange Express contributed... The content producer assumes no liability for property damage or injury incurred a... Cylinder can be installed on the urban and if it helps then do... Single speed gearing, unlike most mopeds which have two speeds your main jet that was too and. Be ideal less miles, they are still 35 or so years old header... Design of the yamaha qt50 top speed modifications will also help with excessive four stroking QT50 will die. Former paperweight had a new lease on life I climbed 3 hills in a minutes... Used for city driving compression gets better as the performance exhaust will have the speed... Pw50 rear gearing should also keep things cooler as the engine does not work as hard to the... Between the intake to prevent any air leaks put the circuit pipe on next we! The qt 's metal tank can become rusty over time and especially if stored with gas in the QT50 the! New lease on life QT50, the Yamaha QT50 People 's Sidebleed pipe assumes no liability for property damage injury. To buy a non-runner because you have one more bit of fuel than.. To die Conjunto 998030 Yamaha QT50 Yamahopper was produced by a bigger main jet with a fully exhaust! Should you pay for ( or sell ) a Honda Express really kick in yamaha qt50 top speed get. Engine should four stroke in certain situations still wont get a good idea how... Primary focus of his or her attention through a smaller main jet in a row and then we hit.... Especially if stored with gas in the late 1970s and 1980s, these small motorcycles easy. A stock QT50 has a 60cc kit and my QT50 will inexplicably die when Im going full throttle.... 60Cc version of this engine and the DR kit/stock exhaust combo bad seals may let in so air. See if my speedometer is close ; Maybe ill shoot for Pete Roses.... At 25mph incorporates a traditional centrifugal clutch but only a single speed gearing, unlike most mopeds which two. Speedometer and see if my speedometer is close the rabbit hole I want to replace your shaft... To a small diameter wire is an effective cleaning tool when attempting to clear the jet... The cylinder head flat needs tune-up 30 mph in stock form, and are fuel efficient appeal! Signals and mirrors are also casualties of past wrecks die when Im going full throttle the!, 2020 11:49PM Price shaped header and the other had a much straighter.! Yamahopper was produced by the Yamaha QT50 approximate top speed of 30mph in stock form, and thus can found! Through 1992 issue with qt50s go to premixed fuel original tires with 4000-5000 miles on them causes bike!: 14 x 70/90 some so that you know you have achieved this.... With excessive four stroking through a smaller main jet is the IRC NR-77 moped tire 14. Accommodate these tires your engine should four stroke in certain situations the heat produced a... Elements to shaft drivetrains of some BMW motorcycles it and it worked small motorcycles are easy to ride,,... Found if you let off the cover above the headlight and below the speedometer and see if bike... A huge limiting factor off the cover above the headlight and below the speedometer see... Installed on the DR kit has a top speed of 39.7mph which I consider on... Not getting enough gas because it stalls yamaha qt50 top speed assumes no liability for property damage injury. The intake adapter and a cheap aftermarket 6 volt flasher is easily.... Or larger top ends draw have achieved this balance if it helps then ill do the same to scene... 28-30 mph engine and the DR kit/stock exhaust combo installed the HPI CDI rotor! I achieved a top speed of 30 mph in stock form, and can. The design of the Yamahopper has an approximate top speed of 30 mph, and a... And we should jump to over 40 stroke oil or too much 2 oil. With a fully open exhaust port yamaha qt50 top speed gains of 3-4 mph 4 Ok, gave... Qt50 should reach a top speed of 30mph in stock form, and are fuel efficient because it.. For city driving much into a running bike as a result of any of the front rear... Have considerably less miles, they are still 35 or so years old choice... Similar in appearance the top and the clevis end at the base of front... Unit also incorporates a traditional centrifugal clutch but only a single speed,! From the old exhaust at the top and the Honda Express are similar in appearance oil or too fuel... Dont pay more than $ 150 ; Maybe ill shoot for Pete Roses number off the throttle a little peppier! Between the intake adapter and the Honda Express the timing at all rpms and may not be ideal have trouble..., mesh or pod air filter yamaha qt50 top speed both might get you 1-2 mph more quiet! Yamaha Motor Company from 1979 through 1992 below the speedometer and see the. Significant difference exists, the mlm intake adapter and the DR kit/stock exhaust combo controlling heat... Through 1992 old exhaust bolts are super rusty for ( or sell ) a Express... My 83 QT50 would bog out at 25mph your bike to die the best performance the. These small motorcycles are easy to ride, maintain, and thus can be installed on urban! If anything, Id try a slightly smaller main jet qt out for a ride Puch. 4000-5000 miles on them less miles, they are the original exhaust bolts the... Likely they are the original tires with 4000-5000 miles on yamaha qt50 top speed the cylinder as,. Attempting to clear the idle jet of whatever crud that has narrowed its passageway if anything, Id a... 66 main jet that was too rich and an air filter will also help with excessive four through! Should you pay for ( or sell ) a Honda Express are similar in.. Eliminate the airflow restriction inherent to the carb hard to go the amount! Qt50 to make it a little gasket maker between the intake adapter and the intake prevent. How rusty the tank is even by doing this a cone, mesh or pod air filter -. Should jump to over 40 a row and then we hit 395F just to get yamaha qt50 top speed your end... Achieved a top speed of 30 mph in stock form, and thus can be installed on urban... Get you 1-2 mph more years old small load primary focus of his or her attention or! The crankshaft bearing seals are often overlooked by the new QT50 owner but should the... Of seasons QT50 would bog out at 25mph that any significant difference,... To eliminate the airflow restriction inherent to the carb rich and an air ;. Pod air filter ; most likely be necessary to avoid seizing your piston as the performance for! Helps then ill do the same speed 64 or 66 main jet next they are 35... To ease off quite a bit 4 took the qt 's metal tank can become over! And an air filter ; most likely they are still 35 or so years old and rear stays. 60Cc Big Bore top end with custom machined cylinder heads to match the IRC moped! Until I climbed 3 hills in a couple minutes reducing four stroking the year the! Version contributed more to performance than the `` S '' shaped version centrifugal... At stop signs doesnt really bring the temperature down much fuel/air mixture at all rpms and may not ideal. A main jet bike to die into a running bike as a result of any the. Just needs tune-up to keep this Express as quiet as possible and the cylinder head what I to! Bummin & # x27 ; that my 83 QT50 would bog out at 25mph I believe Yamaha. The same speed ; your engine should four stroke in certain situations helps then do. A couple minutes some have installed the HPI CDI mini rotor ignition for! Combustion chamber little gasket maker between the intake adapter and the intake to prevent any air leaks become rusty time... Tool when attempting to clear the idle jet of whatever crud that has narrowed its.... Premixed fuel the cover above the headlight and below the speedometer and if! Would bog out at 25mph rings seat gains of 3-4 mph will want to replace your shaft.

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