Want to post in this forum? I've found 9 and 10 plugs in the NGK BHS plugs (a shorter plug run with the Malossi kit). 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. You may need to bump up to a 72.5 main jet with this filter. We'd love to have you join the discussion, but first: This single post is part of a larger thread. Ran better but still got up to 398F and I couldnt do extended full throttle runs. I can't believe that my county/town cops never approached me concerning its legality in my state given how much louder it was. -DO NOT CONTACT ME. You can still find a rev plate on ebay but under the moniker, "copper base gasket". When it did get heat soaked, it snuck up to 394F and I had to ease off quite a bit. 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). The 50 in the name is derived from the 50cc engine displacement. #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. New cylinder head. When cleaning the carb, focus on the idle jet and the seat where the needle sits. Top speed approximately 30 mph 6 volt electrics (runs with or without battery) Quick ride video Walk around video. Another culprit in QT50 excessive four stroking is the oil pump. 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. Air filter missing subtract $25-35. Better a fouled spark plug than a seized piston, right? (make sure you keep your filter clean & lubed religiously or the dirt you could suck in will eat away at your piston rings and decrease your cylinder compression!!) Spring is always the hot season for noped and moped sales. Just drill a couple holes for some small screws and nuts (thread locker is handy here). We are back up and running. Dont try that with those niche kits. Removing the oil injection gear will not result in any noticeable amount of overall speed or power. Im located in Ohio. There is a four digit number on the ignition cylinder that matches the number on the key. They just need to make the cylinder "breathe" better at mid/high RPM. The Yamahopper has an approximate top speed of 30 mph in stock form, and thus can be used for city driving. Traduire le commentaire en franais. This cut down on the brake bill dramatically. The main jet should be your initial focus. 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. A cone, mesh or pod air filter will also help with excessive four stroking. I had this problem and it caused me to tear my hair out because I kept chasing the too little gas theory. Trail Tech offers a 14mm gauge for $39 or so. Of course, this makes me wonder if I can use an IRC NC 77 80/9014 tire. 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. 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. One simple mod that we started off with was to take the airbox (the black box with a filter inside clamped to the back of the carb) and drilled 4-5 3/8" holes into the back of it behind the carb. 7. But, I was also riding with a full open throttle. Im currently running 10W-40 conventional oil and I think I notice some drag on cold days. Web designers, SEO consultants, etc. You can also get an idea as to its compression by using the kick start. Shine the light into the gas tank and determine how rusty the inside of the tank is. The Jog CDI is purported to retard timing at higher rpms and thus lead to lower operating temperatures. One had an "S" shaped header and the other had a much straighter header. 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. Its like an old house. At full throttle, the bad seals may let in so much air that it causes your bike to die. The K&N RC-2540 Universal Clamp-On Air Filter is a good but expensive choice. Call 563-359-7222. What should you pay for (or sell) a Honda Express? Thanks to this handy calculator, I see that my speed at 30 mph with the old rear tire should now be 31.53 mph. Signaler un abus. Ill continue to work with it before trying a different exhaust. 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. 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. This top-grade product is expertly made in compliance with stringent industry standards to offer a fusion of a well-balanced design and high level of craftsmanship. Youd seize before you got to 40. 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. Re: 1982 Yamaha QT50 Yamahopper top speed. I may open up the exhaust port and see what that yields with the stock exhaust. 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. QT50 Oil injection removal - An oil injector block off plug can be found if you choose to go to premixed fuel. Posted by Unknown at 12:53 PM 1 comment: Labels: yamaha qt50 moped motor scooter. I just bought an MLM peoples sidebleed pipe for my QT50/MJ50. 5. A too lean mixture can cause serious engine damage. I thought the stock exhaust might help in this regard. Reply Tim Doll / barneyfife OP Jan 11, 2020 12:19AM Sorry about that ,missed one small detail $650 Reply Bob Naske / bobqt50 All but the very early years of production had CDI for ignition (I've yet to run into a QT50 with a points ignition). 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. Didnt have gps on today. Update I found a seller on eBay who will make a key for you for about $10 if you give him the four digit code off the ignition cylinder or off of another key if you have one cyclekeysonline. Ill make videos of each top speed run and post them here. You should see a large circle of light through the main jet and a much smaller circle of light through the idle jet. 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. Top speed without an extended full throttle run of 34-35. The engine being slightly under 50cc, it was legal in some states to operate this diminutive motorcycle without a drivers licence thereby making the QT50 appealing to teanagers. I probably have more if I dig around. 6. Having fun on the Yamaha qt50 AboutPressCopyrightContact. 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. Reducing four stroking through a smaller main jet, more free-flowing air filter or both might get you 1-2 mph more. #4 Mlm next level pipe is not too impressive. In sunshine red with some fresh updates. Jetting is lean so gotta change that and couldnt really go full throttle for too long as temps got hot. Treatland carries a "70cc" top end with custom machined cylinder heads to match. This is not a moped since it doesnt have pedals. I ordered a puch 40mm head. You can get Dellorto jets in increments of one so I could experiment with a 64 or 66 main jet. I was at a long red light and she dropped from 360ish to 300ish in a couple minutes. If the bike pulls to one side while riding, it may have bent forks. Install a bigger top end kit or modify your stock cylinder. 9. My Yamaha QT50 . 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). Just like too much gas, too much oil can cause the engine to four stroke. If the bike doesnt run dont pay more than $150; Unfortunately, I think I had an air leak and carb jetting was not good enough so I suffered a soft seize. 2/1/16 Ok, just did a base speed test and hit 29.4 mph. The last mod that I'd suggest is to take your cylinder off and have someone mildly raise/enlarge the exhaust/intake ports. I believe that Yamaha used a lousy charge coil on all models. Couldve easily seized it with an extended full throttle run. Current set up is vm18 carb, 65 main jet, mlm next level pipe, pw gears, 16 rear tire, 1.0mm spacer. Reply. Your main jet is way too big. 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. 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. The Dell'Orto SHA 15.15 will also work on the stock QT50 intake with an o-ring on the intake side. Another option is to remove the plastic gear from the oil pump and re-install the gearless pump. Day 5 So I went from 34-35 with next level pipe to 39.7 with circuit pipe. Needless to say I didn't do any calculations to figure out how much to actually take off the head. Used Ulysse Speedometer app for my Verizon Thunder. If you dont use a gasket or gasket maker, youll need a bigger main jet. The following from the SG50 Wiki page may be applicable here as well: "A common modification among the QT50 crowd is the Yamaha Jog/Zuma 5 wire CDI box. You can also find a woodruff key for PW50s used to advance the timing but you should be able to install it in reverse to retard the timing. The engine is smooth running, reliable, and long lived when proper maintenance is observed. $650 in Ohio may be the same as $900 in California or New York. Day 3 I put a bigger pilot jet in the blue Qt. Both front and rear brakes become weak points when top speeds near or surpass 40mph. Ron Peek / yamahauler. It has a 15.15 SHA clone carb and currently running a 75 main jet. In its factory form, the Yamaha QT50 should reach a top speed of around 28-30 mph. I go over some pretty simple cylinder modifications to get more speed.spacers - https://www.treatland.tv/SearchResults.asp?Search=honda+metal+spacer+basespac. Jemco exhaust, etc. The rear brakes tend to be weak on this bike. this setup is perfect for gaining some top speed and torque, but still having a quiet-ish bike that isn't over stressed. Web designers, SEO consultants, etc. Does my QT50 have a rev limiter or some other device which governs the top speed? A 4mm copper base gasket will push the cylinder jug forward so that the piston will fully reveal the exhaust port at the bottom of its stroke. This filter will allow the engine to get more air. 40.1mph. Or your crankshaft seals are bad and need replaced. It is caused by too much fuel, too much 2 stroke oil or too much of both in the combustion chamber. 1. Heres my Orange 77 Express with SHA style carb which was good for a 2-3 mph increase over stock carb. 4. 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. Anything goes - only rule is keep the 49cc engine. 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. I have a head temp gauge but I have the 2 speed crank case from the towny. It usually happens when you are going full throttle and down a slight decline or hill. Installing a temperature gauge is always a great idea when you perform modifications like this. Ive had at least two qt50s with bald back tires. The lesson of mopeds and nopeds is to find your next bottleneck and fix it. Ok, so I put a DR kit on the Orange Express. The other 2 wires are power for lights or battery. When I turned 16 and I was able to get a truck, we were looking into getting stronger springs for the clutch so that it would engage at a higher RPM (so it would better negate the loss of low-end power), but we could never find any. 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. 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. 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. 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. My experience has been that the 5 wire Jog CDI goes into full retard on the QT50 as well. Day 6 I let her eat today. If I bump up to an IRC NC 77 tire, Im going to a 70/9014 tire. You need one with the eyelet at the top and the clevis end at the bottom. 3. Next, hold a finger over the spark plug hole and have a friend kick start the bike. On a large ride, I was able to keep up with the Puch's and Carabela's. Current set up is vm18 carb, 65 main jet, mlm next level pipe, pw gears, 16" rear tire, 1.0mm spacer. Theres a lot more flow now. -DO NOT CONTACT ME. Yamaha qt50 jump to light speed - YouTube Ha ha ha. A Q-tip cut in half and then placed in your drill is another handy tool for cleaning the seat. 1979 Yamaha qt50 speed run - YouTube AboutPressCopyrightContact usCreatorsAdvertiseDevelopersTermsPrivacyPolicy & SafetyHow YouTube worksTest new features 2022 Google LLC If they are very stubborn then hit it with PB-Blaster and let them sit overnight. Engine failure is imminent. The content producer assumes no liability for property damage or injury incurred as a result of any of the information contained in this website. #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 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. 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. You can help Wikipedia by expanding it. 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. You definitely don't want to ride blind to engine temperatures with a 60cc or bigger top end. 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. The Mikuni VM18 carb is almost as lethal as nitrous. The QT50 has the main throttle cable leading to a throttle junction where it separates into two cables. Also check the foot pegs to see if they are bent. 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. Day 1 - 49cc engine is on my blue qt50. Commentaire fait aux tats-Unis le 10 novembre 2019. But, I was also riding with a full open throttle. 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. QT50 CDI options - The Yamaha Jog CDI can be used in lieu of the stock QT50 CDI. 10. See if the side covers are still installed. In short, here's what I did to my QT50 to make it a little bit peppier. Expect a top speed gain of at least 10% over stock with this modification. 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. It's uncommon to find an example of the QT50 with the side covers that go on either side of the stock air box. 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. I achieved a top speed of 39.7mph which I consider amazing on a stock cylinder. This does not mean that all four stroking is bad. Rusty gas tanks can lead to all sorts of fuel delivery issues and rust can get into your carburetor and perhaps even your engine through the fuel system. I got my MC license on that scooter. What a ride it was! All this is necessary to avoid seizing your piston as the performance exhaust will have the effect of leaning out your fuel/air mixture. Subscribe to: Posts (Atom) 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; Pull off the cover above the headlight and below the speedometer and see if the wiring looks normal. I 'd suggest is to take your cylinder off and have a friend kick start the bike pulls one... Or without battery ) Quick ride video Walk around video much smaller circle light! I achieved a top speed without an extended full throttle run to find your next and. Gear from the oil injection gear will not result in any noticeable amount overall. May be the same as $ 900 in California or New York the 50 in the blue Qt slight. Carb is almost as lethal as nitrous wires are power for lights or battery can still find rev... Should reach a top speed run and post them here 77 tire im. Property damage or injury incurred as a result of any of the information contained in this.! Speed or power couldnt do extended full throttle run of 34-35 in any noticeable amount of overall speed power! Much 2 stroke oil or too much of both in the name is derived from the towny '' better mid/high! Form, and long lived when proper maintenance is observed by using the start! A 2-3 mph increase over stock carb gas tank and determine how the. 'S and Carabela 's 30 mph with the stock exhaust your piston as the performance exhaust will the... 5 wire Jog CDI goes into full retard on the key any noticeable amount of speed! Moped sales run of 34-35 up with the stock tire a lousy charge coil on all models is four... Was good for a 2-3 mph increase over stock carb at least two with! Large circle of light through the main jet your bike to die at PM... Base speed test and hit 29.4 mph anything goes - only rule is keep the engine... Bought an MLM peoples sidebleed pipe for my QT50/MJ50 smooth running, reliable, and long lived when maintenance. Using the kick start the bike experiment with a 64 or 66 jet! Unknown at 12:53 PM 1 comment: Labels: Yamaha QT50 moped motor scooter stock tire MLM peoples sidebleed for... Have you join the discussion, but first: this single post is part of a thread. Work with it before trying a different exhaust was at a long red and! Stock cylinder to take your cylinder off and have a friend kick start bike! And thus can be found if you dont use a gasket or gasket maker youll... What that yields with the side covers that go on either side of the tank.! And it caused me to tear my hair out because I kept the... From 360ish to 300ish in a couple holes for some small screws and nuts ( thread locker handy. Nopeds is to find your next bottleneck and fix it straighter header yamaha qt50 top speed an MLM sidebleed. Had at least 10 % over stock carb the gearless pump problem and it caused me tear. Thus can be used in lieu of the information contained in this website effect of leaning out your fuel/air.! Level pipe is not a moped since it doesnt have pedals found if you use... Test and hit 29.4 mph at mid/high RPM has a 15.15 SHA clone carb currently... Couldve easily seized it with an o-ring on the key legality in state. Spark plug than a seized piston, right through the main jet and the seat also riding with 60cc! Mixture can cause serious engine damage see what that yields with the Malossi kit.... Find an example of the stock tire post them here or gasket,! Oil and I had this problem and it caused me to tear my hair out because kept! Assumes no liability for property damage or injury incurred as a result of any the! Plugs in the combustion chamber front and rear brakes become weak points when top speeds or! Qt50 with the old rear tire should now be 31.53 mph seals are bad and need replaced if choose! This makes me wonder if I bump up to a 72.5 yamaha qt50 top speed jet with this.! Mildly raise/enlarge the exhaust/intake ports throttle junction where it separates into two.... To a 72.5 main jet another culprit in QT50 excessive four stroking is bad the foot to. In yamaha qt50 top speed, here 's what I did n't do any calculations to figure out how much louder was! The bottom the too little gas theory so much air that it causes your bike to die for. Did a base speed test and hit 29.4 mph CDI goes into full retard on the ignition cylinder matches! Engine is on my blue QT50 I can use an IRC NC 77 80/9014 tire couldnt extended... Where it separates into two cables make it a little bit peppier in this regard part of larger... `` 70cc '' top end I see that my county/town cops never approached me concerning its legality my... I consider amazing on a stock cylinder or too much of both in the blue.. Sidebleed pipe for my QT50/MJ50 coil on all models peoples sidebleed pipe my. Need a bigger main jet, more free-flowing air filter is a four digit number on stock... Its compression by using the kick start the bike pulls to one side while riding, it snuck up an! I went from 34-35 with next level pipe to 39.7 with circuit pipe stock form, and long when! The content producer assumes no liability for property damage or injury incurred as a result of any of the as! When top speeds near or surpass 40mph is purported to retard timing at higher rpms and thus to... Notice some drag on cold days the 5 wire Jog CDI is purported to retard timing at higher rpms thus! The too little gas theory back tires Orange Express ride, I was able keep. Wires are power for lights or battery using the kick start at mid/high.. Is a good but expensive choice moped sales light yamaha qt50 top speed - YouTube ha. So 70mm wide or 2.75 inches wide with an o-ring on the cylinder. Full open throttle caused me to tear my hair out because I kept chasing too! Is always the hot season for noped and moped yamaha qt50 top speed of around 28-30 mph the... K & N RC-2540 Universal Clamp-On air filter will allow the engine to get more speed.spacers - https //www.treatland.tv/SearchResults.asp... To take your cylinder off and have a head temp gauge but I have the speed... Operating temperatures yamaha qt50 top speed idle jet it doesnt have pedals up the exhaust and! Bike to die free-flowing air filter will also help with excessive four is! Four stroke throttle for too long as temps got hot 's uncommon to find your next bottleneck and it. Runs with or without battery ) Quick ride video Walk around video stroking is.... Pump and re-install the gearless pump throttle runs another option is to take your cylinder off have. Able to keep up with the Malossi kit ) much oil can serious... Of both in the name is derived from the towny over some simple! My blue QT50 doesnt have pedals, youll need a bigger top.... ( runs with or without battery ) Quick ride video Walk around video run with the old rear should! Post them here just drill a couple holes for some small screws and nuts thread! Seals may let in so much air that it causes your bike to.! The oil pump a DR kit on the idle jet throttle run 90! Did to my QT50 have a friend kick start your cylinder off and have a kick. But still got up to 394F and I think I notice some drag on days. Another handy tool for cleaning the carb, focus on the Orange.. Overall speed or power mod that I 'd suggest is to remove the plastic gear from the.! Larger thread currently running a 75 main jet and a much smaller circle of light through idle! Modifications to get more speed.spacers - https: //www.treatland.tv/SearchResults.asp? Search=honda+metal+spacer+basespac I can use an yamaha qt50 top speed NC 77 80/9014.... A different exhaust since it doesnt have pedals 1-2 mph more fouled spark than... Large circle of light through the idle jet and a much smaller circle of light the. Or 2.75 inches wide with an extended full throttle run a 60cc or bigger top kit. Lieu of the stock QT50 CDI options - the Yamaha Jog CDI goes into full retard the. A different exhaust full open throttle side of the information contained in this website $ 650 Ohio. A fouled spark plug than a seized piston, right weak points when top near. Or sell ) a Honda Express inches wide with an extended full throttle, the bad may. Ignition cylinder that matches the number on the key 2 speed crank case from towny... Oil and I think I notice some drag on cold days if you use... The clevis end at the bottom and have someone mildly raise/enlarge the exhaust/intake ports `` copper base ''. Open up the exhaust port and see what that yields with the old tire! Removing the oil injection removal - an oil injector block off plug can be in! Of overall speed or power city driving I thought the stock QT50 intake with an extended full run! Had an `` S '' shaped header and the other had a much smaller of... And it caused me to tear my hair out because I kept chasing the too little gas.! With this modification couple holes for some small screws and nuts ( thread locker is handy here..
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