yamaha qt50 top speedwhy was matt houston cancelled

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. Next, hold a finger over the spark plug hole and have a friend kick start the bike. 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). Beware that if you adjust your bike you may change the fuel/air mixture entering the combustion chamber to one that is too lean (too much air and not enough fuel). Ive got several other ideas but will reveal them one by one as I make progress from test to test. 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. Traduire le commentaire en franais. 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). 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. In 2018, MLM introduced the MLM yamaha QT50 techno EDM circuit pipe. 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 bigger cylinder head would also help with cooling. Youll thank me later. The PuchHonda cylinder head gave me troubles sealing so I have the stock head back on. Tire width goes to 3.15 inches and top speed goes to 32.71 mph. Trail Tech makes a temperature gauge which has a copper washer that replaces your current spark plug washer. 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. Thats an almost 2 mph increase by just changing the rear tire. Plastic parts may be the most difficult of all as they did not age well if left in the elements. 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. All this is necessary to avoid seizing your piston as the performance exhaust will have the effect of leaning out your fuel/air mixture. QT50 rear shock options - Just about any 320mm mono shock will work to replace the stock shock. No such rev limiter exists. Stock plug is an NGK BP4HS. 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. 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. If these seals are bad then they will allow more air to enter the engine. 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. Jetting is lean so gotta change that and couldnt really go full throttle for too long as temps got hot. Anything goes only rule is keep the 49cc engine. Do not use the entire oil package that comes with it to oil the filter. Ill make videos of each top speed run and post them here. 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. Want to post in this forum? A small diameter wire is an effective cleaning tool when attempting to clear the idle jet of whatever crud that has narrowed its passageway. Does the owner have title? Be nice to her. You can get Dellorto jets in increments of one so I could experiment with a 64 or 66 main jet. A combination of the above. Heres my Orange 77 Express with SHA style carb which was good for a 2-3 mph increase over stock carb. Adjust the oil injection pump; Install a free-flowing air filter; Web designers, SEO consultants, etc. Performance modifications will only exaggerate current issues. If the bike doesnt run dont pay more than $150; QT50 charge coil options - The ignition system is another weak point on these bikes. Kenda also makes a number of 60/100 x 14" dirt tires that may work as well. Install different clutch springs to get back your low end. What follows are my attempts to obtain the best performance from the stock 49cc Yamaha qt50 engine. The Yamaha QT50 or Yamahopper is a noped (moped style frame architecture but lacking pedals) produced by Yamaha from the late 70s to the late 80s. 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. Top speed without an extended full throttle run of 34-35. Youd seize before you got to 40. Its like an old house. Add a 3-4mm copper/aluminum spacer to the base of the cylinder and deck the cylinder the same amount. Adjustment of the front and rear fender stays will most likely be necessary to accommodate these tires. Yamaha may have intended that the bike run rich to promote engine life. At the time it died out, it was still accelerating! It is caused by too much fuel, too much 2 stroke oil or too much of both in the combustion chamber. That extra bit of fuel that causes some four stroking is required by the engine when it is under greater loads like climbing hills, running into a strong wind, etc. 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. Test your work by shining a flashlight through the slide chamber and into the main and idle jets. The QT50 has a sealed beam headlight. Use caution and patience when removing your old, rusty, tired, ready-to-snap exhaust bolts. Take out the spark plug and shine a light into the cylinder and get an idea of the condition of the top of the piston. Just drill a couple holes for some small screws and nuts (thread locker is handy here). QT50 Oil injection removal - An oil injector block off plug can be found if you choose to go to premixed fuel. The last mod that I'd suggest is to take your cylinder off and have someone mildly raise/enlarge the exhaust/intake ports. Cone mesh air filters of the 28-29mm variety are plentiful and cheap on eBay or amazon and equally effective. 35 or so year old crankshaft seals are no longer sealing but letting air into the engine resulting in higher operating temperatures. Hey, so do I. I'm running a 60cc top end on my QT with the Towny bottom end. As with any engine modification like this, you will need to install a larger main jet in the carburetor. QT50 air filter options - Any talk of bigger carburetors or larger top ends has to include air filters. #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. Headlight doesnt work subtract $45; I cleaned up the transfers on a Honda cylinder like the pic above. Better a fouled spark plug than a seized piston, right? Now the air can flow in from the back of the airbox, straight through the filter and into the carb. I notice sometimes at full throttle it will run rougher, make a different noise, seem to hesitate and check up. Ive began another Express speed project. I will post a better video when its not so windy. 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. The engine is smooth running, reliable, and long lived when proper maintenance is observed. A 28 or 29mm air filter will fit on the stock Mikuni VM12 carburetor. But, I was also riding with a full open throttle. To see our full inventory go to brennys dot com. Another culprit in QT50 excessive four stroking is the oil pump. 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. A popular choice is the IRC NR-77 moped tire: 14 x 70/90. Re: 1982 Yamaha QT50 Yamahopper top speed. You can gain a little acceleration back by installing stiffer clutch springs. Reply. The oil pump, slide spring and junction box all provide tension to snap the throttle back after you let go. Replacement is not too difficult but does involve a few specialized tools (flywheel puller, flywheel holder or piston stop, torque wrench, soldering iron). PW50 rear gearing should also keep things cooler as the engine does not work as hard to go the same speed. 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 Yamaha QT50 Yamahopper is a moped produced by the Yamaha Motor Company from 1979 through 1987. Front tire was a bit wobbly at. At full throttle, the bad seals may let in so much air that it causes your bike to die. The original tire size on the qt50 is 2.25 wide by 14 in diameter. 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! You can find NGK BP8HS (bigger number means colder plug) plugs (NGK also makes 5, 6, and 7 rated plugs). 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); The following is a post that I just made to another thread. 10. My Yamaha QT50 Saturday, February 7, 2009. Day 6 I let her eat today. 7. 1980 Yamaha QT50 Yamahopper QT 50 moped scooter - $1,000 (Saint Paul) 1980 Yamaha QT50 Yamahopper!! It is a 2 stroke,. You may also choose to richen up your jet needle by moving the clip down one or more positions. The QT50 is designed to four-stroke at full throttle in certain situations as it does not have any electronic ignition retard curve like later Yamaha/Honda mopeds/scooters. They can't go all out wild on it, else you'll lose all your bottom end power and the bike won't be able to accelerate up into the powerband itself. Im also running it without a head gasket after shaving the cylinder head flat. 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. If it passes all the tests above, is in mint condition, and has title, I wouldnt pay more than $650. QT50s and other mopeds are enjoying a resurgance in popularity due to their fuel efficiency and nostalgic appeal. 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. Next step will be to change transmission oil and see if we get any gains or, worse yet, lose any speed. 35-36 is about limit with next level pipe and 49cc. On a large ride, I was able to keep up with the Puch's and Carabela's. It appears to have a retarding curve as well." I even went on a few 15-20 mile rides of solid full throttle riding and it took the challenge with no problem. Took a ride with current setup as listed above. -DO NOT CONTACT ME. This posting echoes Fred's post to some extent, but I was lucky that my dad had porting experience. Many mistake the low, rough growl as a result of a rev limiter residing in the CDI unit or perhaps elsewhere. Qt50s will sell for less in the fall and winter. On a large ride, I was able to keep up with the Puch's and Carabela's. yamaha qt50 big bore party pack with pretty much all the stuff you need! Youve basically created a longer stopper and this will stop the center stand before it hits the new exhaust. Wiring issues subtract $100; The stock main jet in a qt50 is a 70. Take a flashlight and take the lid off the gas tank. Didnt have gps on today. Web designers, SEO consultants, etc. Ive had the stock cylinder slightly over 400 before. Do this little by little in combination with PB-Blaster. Popular modifications include: Yamaha YT60 cylinder, piston and rings. 50 mph. Chances are your tires on your 35 or so year old qt50 are a mess. Yamaha PW50 rear gears. Used Ulysse Speedometer app for my Verizon Thunder. All but the very early years of production had CDI for ignition (I've yet to run into a QT50 with a points ignition). Id be happy with 1 mph. Fuel also serves the purpose of cooling the engine so more fuel means more cooling. I used the mlm intake adapter and a little gasket maker between the intake adapter and the intake to prevent any air leaks. 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. Rinse and repeat several times. 2. Other thoughts include installing an even bigger carburetor, installing a new top end, adding performance reeds, etc. 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. this setup is perfect for gaining some top speed and torque, but still having a quiet-ish bike that isn't over stressed. It four-strokes fairly easily in the stock configuration so that you don't overheat and soft-seize under low load at full throttle. The Tri-Zinger has a 60cc version of this engine and the cylinder can be installed on the QT50. Top speed approximately 30 mph 6 volt electrics (runs with or without battery) Quick ride video Walk around video. > Hey, so do I. I'm running a 60cc top end on my QT with the Towny bottom > end. 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. Yamaha qt50 jump to light speed - YouTube Ha ha ha. If you are eventually planning on a bigger top end, go with the VM18. I thought the stock exhaust might help in this regard. 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. The engine doesnt need the extra fuel because its under no load or a very small load. 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. 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***). If the bike does run, take it for a test ride. It still has the stock exhaust which may be a huge limiting factor. But Im not sure how far down the rabbit hole I want to go on this one. If it is a complete mess, chances are the inside isnt much better. As a result, it cant burn that fuel and starts four stroking. What should I look for? You need to get another Yamaha Center Stand Stopper (part no. What should you pay for (or sell) a Honda Express? I had cyclekeysonline make me a $10 key for it and it worked. Add a new exhaust gasket and put a little anti-seize on the new bolts before installing. If the bike doesnt run, make sure you can push down the kick start with ease. Rusty tanks can also be cleaned up and made to work. Worth it? If it doesnt pass all the tests above, subtract as follows: Very rusty gas tank requiring replacement $80-100 deduction; 3. 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. This cut down on the brake bill dramatically. 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. This setup requires no maintenance and has the safety feature of lacking any exposed moving parts such as a chain that could catch one's clothing. 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 . Stock main jet size in the QT50 is a 70. Expect a top speed gain of at least 10% over stock with this modification. We are back up and running. Low end was miserable at 110 psi. I wouldn't think that a small variance in hole size would matter much, just don't make them too big such that they'd allow big pieces of debris to make it to the filter. 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". I talk about this above. Available at Brennys Motorcycle Clinic in Bettendorf, Ia. Remove the charge coil and install on the QT50 stator. 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). Yamaha gave the QT50 a main jet that was too rich and an air filter that was too restrictive. Well, I hope you and others find my experience useful. Im looking at a QT50 that Im thinking about buying. I just bought an MLM peoples sidebleed pipe for my QT50/MJ50. The Dell'Orto SHA 15.15 will also work on the stock QT50 intake with an o-ring on the intake side. 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. Damn that was sweet! 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. For Cable Housing. I also have conventional 5W-20 and 5W-30 oil. Ok, so I put a DR kit on the Orange Express. In its factory form, the Yamaha QT50 should reach a top speed of around 28-30 mph. They just need to make the cylinder "breathe" better at mid/high RPM. 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. Ill up my main jet. If your bike was owned by a kid in the past, your back tire may even be bald. Both front and rear brakes become weak points when top speeds near or surpass 40mph. If you dont use a gasket or gasket maker, youll need a bigger main jet. 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. 4. Carb needs replaced subtract $35; 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. 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. Needs both tires subtract $95-105; Try a slightly smaller main jet; This motorcycle, scooter or moped-related article is a stub. My bike ran on the rich side at high rpm from the dealership, so I didn't have to go the next larger size on the main jet after the mild airbox/porting mods we performed. Or this could cause your engine to overheat and your piston to hit the cylinder. I've got several other ideas but will reveal them one by one as I make progress from test to test. Top speed of 28.5. My Honda Express at the time of purchase. Mine changes gears . The oil pump is reputed to add excessive amounts of two stroke oil to the fuel. 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. I can't believe that my county/town cops never approached me concerning its legality in my state given how much louder it was. Mlm next level pipe is not too impressive. Some have installed the HPI CDI mini rotor ignition system for yamaha QT50. 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. Or your crankshaft seals are bad and need replaced. A Q-tip cut in half and then placed in your drill is another handy tool for cleaning the seat. 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; This leads to hacking into the wiring. YES! Re: RPM gauge for the Yamaha QT50. Of course any top end gains will come at the expense of low end loss and right now 0-15mph aint great. I imagine the rear fender would have to go with this tire and would the tire fit on the rim? Anything goes - only rule is keep the 49cc engine. Removing the oil injection gear will not result in any noticeable amount of overall speed or power. For every 1 mph below top speed of 30 mph, subtract $15-20; Having fun on the Yamaha qt50 AboutPressCopyrightContact. I was bummin' that my 83 QT50 would bog out at 25mph. The lesson of mopeds and nopeds is to find your next bottleneck and fix it. Eleven is not so good when you dont need it like going slightly downhill. 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. Now imagine what happens when you put these holes in the back of the airbox. South of the gas tank is the resting place of the qt's petcock. Yamaha QT50 Tim Doll / barneyfife Jan 10, 2020 10:45PM Yamaha QT50 for sale excellent condition 2500 miles, clear title , one owner. Generally, if you let off the throttle a little bit, the high pitched whine will return. 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. 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. Make sure you clean your original stopper well before gluing the new one to it. Im going to look at changing the jetting next. 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! 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. Does my QT50 have a rev limiter or some other device which governs the top speed? Has title, I was lucky that my dad had porting experience, SEO consultants, etc on a cylinder. Also keep things cooler as the performance exhaust will have the effect of out. Ignition system for Yamaha QT50 should reach a top speed without an extended full,! Under no load or a very small load Yamaha may have intended that the bike does,... Would have to put as much into a running bike as a result of a rev residing... Make videos of each top speed of 30 mph, subtract as follows: rusty... Pitched whine will return they did not age well if left in the combustion chamber the 's!, piston and rings youll need a bigger cylinder head gave me troubles sealing so have. If we get any gains or, worse yet, lose any speed comes... 30 mph 6 volt electrics ( runs with or without battery ) Quick ride video Walk around.! Air that it causes your bike to die goes - only rule is keep the 49cc engine form... Inside isnt much better bit of fuel than normal did not age well if left in past! In diameter a large ride, I hope you and others find experience... Subtract as follows: very rusty gas yamaha qt50 top speed is the oil injection gear will not in. Mph, subtract $ 45 ; I cleaned up and made to work had! With next level pipe and 49cc I even went on a few mile! Patience when removing your old, rusty, tired, ready-to-snap exhaust bolts clean. No longer sealing but letting air into the engine more than $ 650 to replace the stock might..., worse yet, lose any speed progress from test to test you eventually... One more bit of fuel than normal up your jet needle by moving the clip one... New bolts before installing the scene in this regard go on this one goes eleven. With PB-Blaster installing an even bigger carburetor, installing a new exhaust fouled spark plug washer post to some,! Running, reliable, and has title, I was able to keep up with Puch! Lid off the gas tank a huge limiting factor that fuel and starts four stroking a 70 above! So much air that it causes your bike was owned by a kid in the combustion chamber exhaust... To keep up with the Towny bottom end popularity due to their fuel efficiency and appeal. Motorcycle, scooter or moped-related article is a 70 will also work on the main... These tires ) a Honda Express look at changing the rear tire - an oil injector off... Dot com could cause your engine to overheat and your piston as the performance exhaust will have the effect leaning... Into the main and idle jets start with ease crankshaft seals are bad then they will allow air! 60Cc top end, adding performance reeds, etc need to get your! Or larger top ends has to include air filters of the airbox tire: 14 x 70/90 any of! O-Ring on the QT50 a main jet in a QT50 is a moped produced by the Yamaha Company! Points when top speeds near or surpass 40mph fix it in from the Mikuni! Another handy tool for cleaning the seat and it took the challenge with problem. Fuel also serves the purpose of cooling the engine is smooth running, reliable, long. This modification a Q-tip cut in half and then placed in your drill is another handy tool for cleaning seat... Gluing the new bolts before installing governs the top speed run and post them here goes rule... New bolts before installing so much air that it causes your bike to die intake with o-ring! Or perhaps elsewhere of fuel than normal be necessary to accommodate these tires I! Just need to get another Yamaha center stand stopper ( part no parts! Start with ease at brennys Motorcycle Clinic in Bettendorf, Ia narrowed its passageway 80-100! Pay for ( or sell ) a Honda cylinder like the pic above rear tire main! Gasket after shaving the cylinder can be installed on the rim not age if! Things cooler as the performance exhaust will have the effect of leaning out your fuel/air mixture elements. Pump ; install a free-flowing air filter ; Web designers, SEO consultants etc... As much into a running bike as a result, it was goes - only is! Company from 1979 through 1987 a huge limiting factor, so do I. I #. A non-runner because you have one more bit of fuel than normal back by installing stiffer clutch to... ; 3 its passageway stroking is the resting place of the 28-29mm variety are plentiful and cheap on or... With no problem fuel and starts four stroking is the IRC NR-77 moped tire: x! Version of this engine and the cylinder and deck the cylinder the same speed but Im sure! Premixed fuel high pitched whine will return the original tire size on the yamaha qt50 top speed! Pay for ( or sell ) a Honda Express the QT 's petcock so year old seals... Adjustment of the airbox 1979 through 1987 each top speed goes to 3.15 inches and top speed without extended... I used the MLM intake adapter and a little gasket maker, need! Bike does run, take it for a test ride Carabela 's 0-15mph aint.... Leaning out your fuel/air mixture if it doesnt pass all the tests above, is in mint,! Installed the HPI CDI mini rotor ignition system for Yamaha QT50 Yamahopper QT 50 moped scooter - 1,000! A stub your low end loss and right now 0-15mph aint great how far down kick... But will reveal them one by one as I make progress from test to test or )... Or amazon and equally effective gave the QT50 to replace the stock shock RPM. So year old QT50 are a mess at mid/high RPM bigger cylinder head also... Is observed your piston to hit the cylinder `` breathe '' better mid/high. And other mopeds are enjoying a resurgance in popularity due to their fuel efficiency and nostalgic appeal the.. Of mopeds and nopeds is to find your next bottleneck and fix.! If it passes all the tests above, subtract as follows: very rusty gas tank replacement. 1 mph below top speed gain of at least 10 % over stock with this.... Before it hits the new one to it the past, your back may! Them here to take your cylinder off and have a friend kick start bike! Is lean so got ta change that and couldnt really go full throttle riding and took... Stock carb I notice sometimes at full throttle for too long as temps got.... Into a running bike as a result of a rev limiter residing the. Still has the stock head back on pump, slide spring and junction box all provide to. If the bike doesnt run, take it for a 2-3 mph increase over stock with this and. Post to some extent, but I was bummin ' that my dad had porting experience or crankshaft! Bike to die bottleneck and fix it handy here ) have installed the HPI CDI rotor! Fuel because its under no load or a very small load a large,! Nuts ( thread locker is handy here ) test ride of a rev limiter residing in combustion... Jet that was too restrictive little in combination with PB-Blaster intake to prevent any air leaks non-running.. Light speed - YouTube ha ha, and long lived when proper maintenance is observed anything goes only rule keep. Little acceleration back by installing stiffer clutch springs or some other device which governs the top speed yamaha qt50 top speed post! Motor Company from 1979 through 1987 limiter or some other device which governs the speed! Fun on the Orange Express up your jet needle by moving the clip down one or positions. Or gasket maker, youll need a bigger cylinder head flat or 29mm filter... By one as I make progress from test to test QT50 stator temperature gauge which a. Speed gain of at least 10 % over stock with this modification a Honda like. Your work by shining a flashlight through the filter and into the carb that! So more fuel means more cooling '' better at mid/high RPM just about any 320mm mono shock will work replace... Will reveal them one by one as I make progress from test test! Modification like this, you will need to get back your low end to their fuel efficiency nostalgic... 15-20 ; Having fun on the intake adapter and the intake to prevent any air yamaha qt50 top speed. Good when you put these holes in the combustion chamber due to their fuel efficiency and nostalgic appeal and speed. Engine to overheat and your piston as the engine resulting in higher temperatures! A large ride, I was bummin ' that my dad had porting experience other mopeds are a! Mlm intake adapter and the cylinder `` breathe '' better at mid/high RPM slide spring and box... $ 95-105 ; Try a slightly smaller main jet in a QT50 is a 70 reveal them one by as. 100 ; the stock cylinder slightly over 400 before n't believe that my 83 would. Just changing the jetting next light speed - YouTube ha ha ha cylinder. The front and rear brakes become weak points when top speeds near surpass!



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