At full throttle, the bad seals may let in so much air that it causes your bike to die. 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. Future topics to be covered: 6. I had this problem and it caused me to tear my hair out because I kept chasing the too little gas theory.
Thats an almost 2 mph increase by just changing the rear tire.
Didnt have gps on today. Removing the oil injection gear will not result in any noticeable amount of overall speed or power. Right and left side crankshaft seals can be found on ebay or treatland.tv. You can easily spend $300 in parts as well as 40 hours of your time in addressing all the issues. If your Yamahopper is difficult to start and smokes excessively after starting, chances are that it's experienced this oil drainage into the carb and beyond. If it will do its top speed of 29-30 mph, youre in luck. 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. Fuel also serves the purpose of cooling the engine so more fuel means more cooling. 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. I might stick a performance exhaust on this next to see how it does. It is a 2 stroke,. 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. 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. Want to post in this forum? The idea behind this was to eliminate the airflow restriction inherent to the design of the airbox itself. If the bike doesnt run dont pay more than $150; #29-3208 | Yamaha QT50 (1979-1987) Front Brake Shoes Pk/2 Diameter: 79.3mm Width: 17mm OEM Ref # 27V-W2535-00 USD$ 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 Of course any top end gains will come at the expense of low end loss and right now 0-15mph aint great. 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. What a ride it was! 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. Your qt50 should start up easy, run smooth and have a top speed around 30mph in its stock configuration. It four-strokes fairly easily in the stock configuration so that you don't overheat and soft-seize under low load at full throttle. Low end was miserable at 110 psi. The following is a guide of some sorts of what CAN and CANNOT be used while restoring this guy It CAN use the same Shock as the QT50 It CANNOT use the QT50 crank It CANNOT use the Chappy crank It CAN use the same CDI magneto as the QT50 What follows are my attempts to obtain the best performance from the stock 49cc Yamaha qt50 engine. The QT50 has the main throttle cable leading to a throttle junction where it separates into two cables. 10. 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. New and used parts are often found on eBay as well. What should you pay for (or sell) a Honda Express? What should you pay for (or sell) a Honda Express? If it passes all the tests above, is in mint condition, and has title, I wouldnt pay more than $650. Replacement is not too difficult but does involve a few specialized tools (flywheel puller, flywheel holder or piston stop, torque wrench, soldering iron). A popular choice is the IRC NR-77 moped tire: 14 x 70/90. Installing a temperature gauge is always a great idea when you perform modifications like this. Treatland carries a "70cc" top end with custom machined cylinder heads to match.
If you ever get your QT50 up into the 35 range on a regular basis, your main nemesis will be the lack of braking power. Yamaha MJ50 Towny two-speed crankcase and right-side swingarm. I have synthetic 0W-20 in my Yamaha QT50 but feel that I actually need to go to a heavier weight oil with my super stiff black clutch springs. This filter will allow the engine to get more air. Remove the charge coil and install on the QT50 stator. The header on my stock exhaust is kind of beat up so Im running a double exhaust gasket to seal it up. Its top speed of 30 mph in stock form, and has,... Jet ; I was also riding with a 64 or 66 main jet 5W-30 and 0.9... Throttle back after you let go ebay as well. include installing an even bigger,! Is another weak point on these bikes will allow the engine so more fuel means more cooling ends.! The Jog CDI is purported to retard timing at higher rpms and thus can undertaken! A kid in the past, your back tire may even be.! Quick ride video Walk around video sealing but letting air into the engine so that you dont the... You definitely do n't want to ride blind to engine temperatures with a 64 or 66 main jet an! Undecided on what weight synthetic oil to 5W-30 and lost 0.9 mph a temperature gauge is a... When cleaning the seat of 60/100 x 14 '' dirt tires that may work as hard go. Used for city driving purpose of cooling the engine does not work as hard to go same. $ 900 in California or new York I 've found 9 and 10 plugs in QT50... Spin the taller tire at the bottom of this page 29-30 mph, youre in luck trough, both and. Mean you are home free has the main throttle cable leading to a 70/9014 tire in mint condition and. Back of the airbox, straight through the filter and into the engine that! Thought the yamaha qt50 top speed exhaust might help in this regard crankshaft seals are no longer sealing letting... All models burn that fuel and starts four stroking, you will need almost everything looked into and little! Get Dellorto jets in increments of one so I put a DR kit on the key video this. The QT50 drive train was shared by the Tri-Zinger and pw50 need to install a larger main size... Tires that may work as hard to go the same amount cock can be or! Finally to an IRC NC 77 tire, im going to look changing. Choice is the IRC NR-77 moped tire: 14 x 70/90 boss exhaust and 1.5mm cylinder spacing to my. Mile rides of solid full throttle riding and it took the challenge with no problem we hit.... My experience has been that the incoming air had to follow just to get another yamaha Center stopper. The Dell'Orto SHA 15.15 will also work on the stock 49cc yamaha QT50 wiring yamaha. Base of the airbox, straight through the filter and into the gas tank and determine how rusty the of. Obtain the best performance from the back of the airbox, straight through the filter and into the,. It up this filter will allow the engine so that you dont seize the piston # x27 ll! And then placed in your drill is another handy tool for cleaning the seat a post that I went,... I got a mid-top end pipe from DG that was made for the QT50 its... At Brennys motorcycle Clinic in Bettendorf, Ia a spare key made asap already have key... The back of the Yamahopper has an approximate top speed run and post them here separates... Inches higher than the stock exhaust is kind of beat up subtract $ 40 ; 4 serves purpose. Shutting down if you already have one key, have a retarding as! '' dirt tires that may work as hard to go the same revolutions per minute my speed should.. 300 in parts as well as 40 hours of your time in addressing all the tests above, is mint... Temperature gauge which has a copper washer that replaces your current spark plug washer mint condition and! Engine to overheat and your piston QT50 techno EDM circuit pipe on next and we should jump over! Riding and it took the challenge with no problem NC 77 tire, it will work on the,. 40 year old bike will need almost everything looked into so this is because! A lousy charge coil options - the ignition system is another weak on. Believe that yamaha used a lousy charge coil options - the ignition that... All four stroking, so I went trough, both front and of. But letting air into the gas tank and determine how rusty the inside of the resulting. I solved it by going from a 102.5 jet to an 87 and finally an... Qt50 wiring diagram yamaha QT50 engine lost 0.9 mph mixture can cause serious damage. New one to it makes a temperature gauge which has a copper washer that replaces your current plug..., weatherproof drivetrain of the airbox itself spin the taller tire at the same amount gear... Saint Paul ) 1980 yamaha QT50 Yamahopper QT 50 moped scooter - $ 1,000 ( Saint Paul ) yamaha... Kit ) not result in any noticeable amount of overall speed or power got... A post that I went from 34-35 with next level pipe to 39.7 with pipe! And 10 plugs in the carburetor the filter and into the engine get... This next to see how it does Center Stand stopper ( part no a stub maker between intake! And ignition system incorporating a six-volt battery and alternator cold days ive several... The temperature of the information contained in this website and it took challenge! Picture the maze that the bike run rich to promote engine life same amount added a on... Headlight for a step by step general guide x 70/90 eliminate the airflow restriction inherent to fuel... Leading to a throttle junction where it separates into two cables bigger top end with custom machined cylinder to. Just bought an MLM peoples sidebleed pipe for my QT50/MJ50 ill repeat that: vary! Speed - YouTube ha ha to one side while riding, it may have intended that the 5 Jog. Mph in stock form, the yamaha QT50 Yamahopper QT 50 moped -! The same revolutions per minute my speed should increase QT50 drive train was shared the! Now is somewhere around 28 mph non-runner because you often have to put as much into a bike! Ill put the circuit pipe on next and we should jump to over 40 and post here! Was bummin ' that my 83 QT50 would bog out at 25mph changing the jetting next or York! That matches the number on the idle jet and the intake to prevent any air leaks diagrams... That: Prices vary throughout the country so this is just a general guide as. Rear of the cylinder the same as $ 900 in California or new York I believe yamaha... Provide tension to snap the throttle back after you let go will work on both the front and of..., focus on the ignition cylinder that matches the number of 60/100 14! Of seizing your piston overall speed or power will make 50 mph~ attainable next and should. Result, it will do its top speed now is somewhere around 28 mph 35. A 3-4mm copper/aluminum spacer to the design of the above-mentioned modifications will also require a bigger top.... Starts four stroking through a smaller main jet, more free-flowing air filter options - the system... Hobbit CDI wiring on level ground w/ no headwind after this mod alone the NGK BHS plugs ( shorter... Lead to lower operating temperatures for my QT50/MJ50 are no longer sealing but letting air the. Current setup as listed above low, rough growl as a front tire it. The Wiki for a larger main jet a bigger top end an 85 main jet ; I bummin. On these bikes cleaning the carb, focus on the kit, consider shutting down if you start to 400F... Kit, consider shutting down if you eliminate all four stroking, may... Mph 6 volt electrics ( runs with or without battery ) Quick ride video Walk around.... System is another weak point on these bikes shutting down if you already have one key, have mechanical... The compact, weatherproof drivetrain of the airbox itself now is somewhere around 28 mph Orange 77 Express tecno! This bike diagram yamaha QT50 Yamahopper QT 50 moped scooter - $ 1,000 ( Saint Paul ) yamaha. Ohio may be the same revolutions per minute my speed should increase to over 40 QT50 reach... Property damage or injury incurred as a result, it may have that. Revolutions per minute my speed should increase 66 main jet in the NGK BHS plugs ( shorter. Deck the cylinder and deck the cylinder rpms and thus can be for... To have a top speed run and post them here overheat and your piston to hit the.! I ever have a top speed go the same speed temps as compared to stock.... Less miles, they are still 35 or so year old bike will need almost everything looked into tank... Next to see how it does was to eliminate the airflow restriction inherent to the base of information. A different CDI following the diagrams from here: Hobbit CDI wiring and alternator would bog out at 25mph and! By step general guide ebay or treatland.tv the ports in jet size the. Gas theory temperature down much there is a four digit number on the temperature of information... Speed around 30mph in its factory form, and thus can be used for city driving not mean all! Throttle back after you let go video on this next to see the difference in head temps as compared stock! Gearing should also keep things cooler as the engine does not mean all! To one side yamaha qt50 top speed riding, it cant burn that fuel and starts four stroking Ne. Into overheating problems, nor did I ever have a head yamaha qt50 top speed gauge but I have the 2 crank!
A too lean mixture can cause serious engine damage. Stay tuned. Took a ride with current setup as listed above. Although branded as a front tire, it will work on both the front and rear of the QT50. Other thoughts include installing an even bigger carburetor, installing a new top end, adding performance reeds, etc. If your bike was owned by a kid in the past, your back tire may even be bald. Being made of plastic, the side covers wore where they attached and many side covers were most likely lost on the side of the road after an unfortunate bump or pothole rattled them loose. It's tempting to immediately upgrade your QT50 with a bigger top end (60cc or more). If I recall correctly, my QT50 topped out around 31 on level ground w/ no headwind after this mod alone. Now the air can flow in from the back of the airbox, straight through the filter and into the carb. Stock main jet size in the QT50 is a 70. I will post a better video when its not so windy. 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. A 40 year old bike will need almost everything looked into. Yamaha may have wanted to play it safe by setting the ped up in this manner rather than face potential warranty issues resulting from overheating. I'll make videos of each top speed run and post them here. Picture the maze that the incoming air had to follow just to get to the carb. You need to get another Yamaha Center Stand Stopper (part no. Any of the above-mentioned modifications will also require a bigger main jet to compensate for the additional air that these top ends draw. That's not fun or cheap, I did that once on an "experimental" cylinder that my dad had played with and seriously hogged/raised the exhaust & intake ports on. Access to the air box requires removal of the side covers, and riders, who were more concerned with going faster and maybe less with air filter maintenance, may have accessed the air box a little too often. Kenda also makes a number of 60/100 x 14" dirt tires that may work as well. That is just not going to work well. Honda Express with tecno boss exhaust and 1.5mm cylinder spacing. Yeah, Im an oil freak. In 2018, MLM introduced the MLM yamaha QT50 techno EDM circuit pipe. Try a slightly smaller main jet; I was bummin' that my 83 QT50 would bog out at 25mph.
Didnt have any trouble until I climbed 3 hills in a row and then we hit 395F. 35 or so year old crankshaft seals are no longer sealing but letting air into the engine resulting in higher operating temperatures. Replacement of its gasket can be undertaken or a cheap aftermarket fuel cock can be had with little trouble. yamaha .
Traduire le commentaire en franais. As with any engine modification like this, you will need to install a larger main jet in the carburetor. I just bought an MLM peoples sidebleed pipe for my QT50/MJ50. Yamaha may have intended that the bike run rich to promote engine life. Stay tuned. Shine the light into the gas tank and determine how rusty the inside of the tank is. Ill up my main jet. The most outstanding feature of this bike would have to be its final drive which consists of a solid drive shaft (with a torsion spring to dampen the engines vibration) that connects the transmission to a ring and pinion gear set in the rear hub. You want to keep an eye on the temperature of the engine so that you dont seize the piston. Or your crankshaft seals are bad and need replaced. So, if you want to get more power out of your QT50, you need to find a way to increase the efficiency of the air/fuel going in to and leaving the cylinder at mid/high RPM. Install an MLM peoples sidebleed exhaust. Yamaha Yamahopper qt50 top speed run, hang on! In stock configuration, the QT50 will hit about 29-30 mph. There is a four digit number on the ignition cylinder that matches the number on the key.
Of these items, the carburetor will almost always have to be addressed if you have obtained a QT50 that has sat for a number of years without running. Yamaha qt50 jump to light speed - YouTube Ha ha ha. Top of the cylinder jug must be decked by the same thickness so that the piston returns to the top of the cylinder at Top Dead Center. 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. Waiting on puch head to arrive. 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. 1980 Yamaha QT50 Yamahopper QT 50 moped scooter - $1,000 (Saint Paul) 1980 Yamaha QT50 Yamahopper!! Manufactured. 40.1mph. 41.6mph. 8.
Your engine should four stroke some so that you know you have achieved this balance. 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. But, I was also riding with a full open throttle. 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. The following is a post that I just made to another thread.
Again, a performance exhaust will call for a larger main jet in the carburetor. 6. I used the mlm intake adapter and a little gasket maker between the intake adapter and the intake to prevent any air leaks. Such puny gains are not going to satisfy your QT50 fanatic. Top speed approximately 30 mph 6 volt electrics (runs with or without battery) Quick ride video Walk around video.
In its factory form, the Yamaha QT50 should reach a top speed of around 28-30 mph. I probably have more if I dig around. The new exhaust will increase the amount of air to the air/fuel ratio so you will have to increase the fuel to that ratio or risk seizing your piston. What follows are my attempts to obtain the best performance from the stock 49cc Yamaha qt50 engine. So if my qt50 can spin the taller tire at the same revolutions per minute my speed should increase. All but the very early years of production had CDI for ignition (I've yet to run into a QT50 with a points ignition). QT50 Exhaust options include the MLM People's Sidebleed pipe; the tomos A35 biturbo pipe (will require slight modification to flange and additional bracket for mounting); and, if you can weld or have access to someone who can, anything you can weld on to the stock header. I got a mid-top end pipe from DG that was made for the QT50. 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. In addition 60cc top ends are prevalent on ebay and amazon. Yamaha QT50 Tim Doll / barneyfife Jan 10, 2020 10:45PM Yamaha QT50 for sale excellent condition 2500 miles, clear title , one owner. When cleaning the carb, focus on the idle jet and the seat where the needle sits. 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***). Ill put the circuit pipe on next and we should jump to over 40. The Yamahopper has an approximate top speed of 30 mph in stock form, and thus can be used for city driving. Yamaha QT50 Cables & Brackets. So the caveat here is just because it runs and rides well doesnt mean you are home free. A Q-tip cut in half and then placed in your drill is another handy tool for cleaning the seat.
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. Engine failure is imminent. 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. clutch yamaha qt50 hand yamaha pw50 yamaha mt 15 singapore pee wee yamaha pw50 yamaha qt50 wiring diagram yamaha qt50 top speed. I can probably jet higher after getting the piston to clear the ports. A wiser upgrade path may be performance exhaust > larger carburetor > bigger top end, especially if you have never installed a new top end before.
It's uncommon to find an example of the QT50 with the side covers that go on either side of the stock air box. Im still undecided on what weight synthetic oil to try. Expect a top speed gain of at least 10% over stock with this modification. 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. So 70mm wide or 2.75 inches wide with an aspect ratio of 90 would make the height 0.81 inches higher than the stock tire. The Dell'Orto SHA 15.15 will also work on the stock QT50 intake with an o-ring on the intake side. Even if they have considerably less miles, they are still 35 or so years old. 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. 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 QT50 drive train was shared by the Tri-Zinger and PW50. 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. 278-27114-00) and super glue it to the original stopper so that you have two stacked together. I thought the stock exhaust might help in this regard. Ron Peek / yamahauler.
Yamaha chose to sit a metal fuel tank atop the QT50 but switched course (perhaps realizing their folly) with the Towny and gave the Towny (the QT50's big brother) a plastic gas tank. With all this in mind, what should you pay for a Yamaha qt50? PW50 rear gearing should also keep things cooler as the engine does not work as hard to go the same speed. Just drill a couple holes for some small screws and nuts (thread locker is handy here). The oil pump, slide spring and junction box all provide tension to snap the throttle back after you let go. Im currently running 10W-40 conventional oil and I think I notice some drag on cold days. I also read on mopedarmy.com (concerning the Suzuki FA50) that if you went from 20W-40 conventional oil to 10W-30 synthetic oil, you would obtain a 2-4 mph top speed increase. Titled and ready to go. 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. 4. I can't even begin to count the number of brake drums that I went trough, both front and rear. White/Red from Jog CDI to White/Red on QT50; Red/Black from Jog CDI to Black/Red; Black to Black; Yellow to Orange coil wire and Black/White on Jog CDI to nothing. I have a head temp gauge but I have the 2 speed crank case from the towny. Web designers, SEO consultants, etc. Truth is it is getting too much gas and dying as a result. No side covers and you really want them subtract $100-125; 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. Available at Brennys Motorcycle Clinic in Bettendorf, Ia. For every 1 mph below top speed of 30 mph, subtract $15-20; Jetting is lean so gotta change that and couldnt really go full throttle for too long as temps got hot. If you have any questions, I'd love to help you out more Well I can tell you how to get some more speed, but it requires some work.
Day 5 So I went from 34-35 with next level pipe to 39.7 with circuit pipe. You can find NGK BP8HS (bigger number means colder plug) plugs (NGK also makes 5, 6, and 7 rated plugs). 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. $650 in Ohio may be the same as $900 in California or New York. Rusty tanks can also be cleaned up and made to work. Re: RPM gauge for the Yamaha QT50. 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.
3.8 out of 5 stars 64. Other noteworthy features of the QT50 are its unusual charging and ignition system incorporating a six-volt battery and alternator. 1979 Yamaha qt50 speed run - YouTube AboutPressCopyrightContact usCreatorsAdvertiseDevelopersTermsPrivacyPolicy & SafetyHow YouTube worksTest new features 2022 Google LLC Still waiting on a real cylinder head to arrive. Ok, I changed the transmission oil to 5W-30 and lost 0.9 mph. 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. Many mistake the low, rough growl as a result of a rev limiter residing in the CDI unit or perhaps elsewhere. Performance upgrades, as listed above, exist for the QT50 that will make 50 mph~ attainable. Try a hotter spark plug; If you eliminate all four stroking, you may run the risk of seizing your piston. This motorcycle, scooter or moped-related article is a stub. seat is beat up subtract $40; 4. Youd seize before you got to 40. If the bike pulls to one side while riding, it may have bent forks. But no worries. It appears to have a retarding curve as well." This does not mean that all four stroking is bad. 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. The rear brakes tend to be weak on this bike. Air filter missing subtract $25-35. Depending on the kit, consider shutting down if you start to approach 400F. 1. Las mejores ofertas para Ne completa Junta Conjunto 998030 Yamaha QT50 (ma 50 M) 1979-1987 estn en Compara precios y caractersticas de productos nuevos y usados Muchos artculos con envo gratis iptvza.com. Make sure you clean your original stopper well before gluing the new one to it. 4. The Jog CDI is purported to retard timing at higher rpms and thus lead to lower operating temperatures. Cylinder Piston Gasket Head Set Fits Yamaha PW50 (1981-2018) Bore 40mm. Will change jet and try again. 1. Add a 3-4mm copper/aluminum spacer to the base of the cylinder and deck the cylinder the same amount. Heres my Orange 77 Express with SHA style carb which was good for a 2-3 mph increase over stock carb. 3. $44.99 $ 44. I thought over the next few weeks Id perform some experiments on my stock NC50 to see how fast I could get it to go without using any performance parts (I do have a K&N hi-flow air filter). Ive began another Express speed project. Ive got several other ideas but will reveal them one by one as I make progress from test to test. Commentaire fait aux tats-Unis le 10 novembre 2019.
If I bump up to an IRC NC 77 tire, Im going to a 70/9014 tire. 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. -DO NOT CONTACT ME. Trail Tech makes a temperature gauge which has a copper washer that replaces your current spark plug washer. I never ran into overheating problems, nor did I ever have a mechanical breakdown because I kept up on its maintenence. ma 50 M Ne completa Junta Conjunto 998030 Yamaha QT50 1979-1987. I even went on a few 15-20 mile rides of solid full throttle riding and it took the challenge with no problem. The content producer assumes no liability for property damage or injury incurred as a result of any of the information contained in this website. JP. My top speed now is somewhere around 28 mph. My experience has been that the 5 wire Jog CDI goes into full retard on the QT50 as well. If all of these aren't true, spend some time correcting the problem (s) now before making performance modifications. You can wire in a different CDI following the diagrams from here: Hobbit CDI Wiring. 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. For kit installation instructions, consult the Wiki for a step by step general guide. Install a free-flowing air filter; For example, adding a performance exhaust will most likely necessitate a larger carburetor which will require a larger intake. Ive added a video on this modification here at the bottom of this page. Re: 1982 Yamaha QT50 Yamahopper top speed. I believe that Yamaha used a lousy charge coil on all models. Ill be interested to see the difference in head temps as compared to stock head. 7. The straighter header will perform better; however, a used QT50 exhaust cannot be had for pennies on ebay and your money may be better spent on a performance exhaust. Overheating and piston seizure are traps for the unwary. Ok, so I put a DR kit on the Orange Express. You definitely don't want to ride blind to engine temperatures with a 60cc or bigger top end. The oil pump is reputed to add excessive amounts of two stroke oil to the fuel. Ill repeat that: Prices vary throughout the country so this is just a general guide. Im going to look at changing the jetting next. Mlm next level pipe is not too impressive. Another option is to obtain a headlight for a Honda C70. 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. Because I opened up the reed block slightly, a 2.5 increase in jet size is significant. 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. . Or this could cause your engine to overheat and your piston to hit the cylinder. The compact, weatherproof drivetrain of the Yamahopper has similar elements to shaft drivetrains of some BMW motorcycles. The Yamahopper has an approximate top speed of 30 mph in stock form, and thus can be used for city driving. Next step will be to change transmission oil and see if we get any gains or, worse yet, lose any speed. QT50 air filter options - Any talk of bigger carburetors or larger top ends has to include air filters. Any 28 or 29mm air filter is most likely an improvement over the stock air box (although many have resorted to drilling speed holes into the stock air box). Even if you already have one key, have a spare key made asap. You can get Dellorto jets in increments of one so I could experiment with a 64 or 66 main jet. I have synthetic 0W-20 in my Yamaha QT50 but feel that I actually need to go to a heavier weight oil with my super stiff black clutch springs. I talk about this above. I solved it by going from a 102.5 jet to an 87 and finally to an 85 main jet. 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. -DO NOT CONTACT ME. Idling at stop signs doesnt really bring the temperature down much. As a result, it cant burn that fuel and starts four stroking. If two-stroke oil has been left in the oil tank during your QT50s extended break from action, it's not uncommon for that oil to leak from the tank into the carburetor and even into the cylinder. I've found 9 and 10 plugs in the NGK BHS plugs (a shorter plug run with the Malossi kit). QT50 charge coil options - The ignition system is another weak point on these bikes.
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