I cleaned up the transfers on a Honda cylinder like the pic above. In short, here's what I did to my QT50 to make it a little bit peppier. The lesson of mopeds and nopeds is to find your next bottleneck and fix it. I have a head temp gauge but I have the 2 speed crank case from the towny. Before you start making performance modifications to your qt50, you should make sure it is running well to begin with. 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. 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. If I bump up to an IRC NC 77 tire, Im going to a 70/9014 tire. If it passes all the tests above, is in mint condition, and has title, I wouldnt pay more than $650. The oil pump is reputed to add excessive amounts of two stroke oil to the fuel. A small diameter wire is an effective cleaning tool when attempting to clear the idle jet of whatever crud that has narrowed its passageway. 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. 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. The immediate goal is to break 40 and then shoot for 45 mph. I got a mid-top end pipe from DG that was made for the QT50. A 69 jet seems better for that Orange Express. Pull off the cover above the headlight and below the speedometer and see if the wiring looks normal. Reply. dead battery subtract $25; 4. I can bump the main jet again and see if that does the trick. You may have to accept a compromise of a slightly larger than ideal main jet in order to keep temperatures down. Youll think your qt is not getting enough gas because it stalls. Hey, so do I. I'm running a 60cc top end on my QT with the Towny bottom end. Damn that was sweet! Having fun on the Yamaha qt50 Ha ha ha. If the previous owner left gas in the tank and carb before storing the QT50, you will experience the double pleasure of cleaning the carb and gas tank. What should you pay for (or sell) a Honda Express? 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. Youll need to increase the size of the main jet when you do this. Better a fouled spark plug than a seized piston, right? In late 2017, MLM came out with the QT50 Next Level Stock Pipe. Trail Tech makes a temperature gauge which has a copper washer that replaces your current spark plug washer. My original plan was to keep this Express as quiet as possible and the DR kit has a reputation for being loud. A larger carburetor may even be a better choice than the stock carburetor with a larger jet. Keep this principle in mind. It has a high rpm retarding feature that keeps the temps down by retarding the ignition timing as the rpms increase. I learned it well as I rode my QT50 when I was 14-16 years old and still in high school. 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). This is not a moped since it doesnt have pedals. If it does not, your compression will suffer. 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. Reducing four stroking through a smaller main jet, more free-flowing air filter or both might get you 1-2 mph more. Picture the maze that the incoming air had to follow just to get to the carb. 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. 40.1mph. 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. (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!!) Try a hotter spark plug; 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 assumes no liability for property damage or injury incurred as a result of any of the information contained in this website. I talk about this above. We are ready to rock as soon as the weather cooperates. 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. Try a slightly smaller main jet; You will also want the Malossi exhaust gasket. 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. Im still undecided on what weight synthetic oil to try. I never ran into overheating problems, nor did I ever have a mechanical breakdown because I kept up on its maintenence. This is the trade off for more top speed. Reply Tim Doll / barneyfife OP Jan 11, 2020 12:19AM Sorry about that ,missed one small detail $650 Reply Bob Naske / bobqt50 I notice sometimes at full throttle it will run rougher, make a different noise, seem to hesitate and check up. The QT50 has a sealed beam headlight. Eliminate your oil pump and just use pre-mixed gas/oil at a specific ratio (50:1 or so); Trail Tech offers a 14mm gauge for $39 or so. If you lose the oil pump, you also lose some of that snap-back tension. 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 Express with tecno boss exhaust and 1.5mm cylinder spacing. 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. This motorcycle, scooter or moped-related article is a stub. Chances are you still wont get a good idea of how rusty the tank is even by doing this. 4. 2/8/19 Ok, I gave up on the DR kit/stock exhaust combo. I've got several other ideas but will reveal them one by one as I make progress from test to test. Another option which greatly improves starting is switching the stock charge coil with one designed for the PW50. Pull off the battery cover and check out the wiring in the back as well. I was bummin' that my 83 QT50 would bog out at 25mph. Used Ulysse Speedometer app for my Verizon Thunder. 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. Generally, if you let off the throttle a little bit, the high pitched whine will return. Now imagine what happens when you put these holes in the back of the airbox. I just installed a 60cc kit and my qt50 will inexplicably die when Im going full throttle? Thats an almost 2 mph increase by just changing the rear tire. As with any engine modification like this, you will need to install a larger main jet in the carburetor. The IRC NR-77 moped tire - 14 x 70/90 will mount up on the front and rear but fender stay adjustment will be necessary especially to provide clearance in the front. Maybe sooner if you want to be more cautious. 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. Add a new exhaust gasket and put a little anti-seize on the new bolts before installing. 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. Performance upgrades, as listed above, exist for the QT50 that will make 50 mph~ attainable. Install different clutch springs to get back your low end. New and used parts are often found on eBay as well. Ok, I changed the transmission oil to 5W-30 and lost 0.9 mph. seat is beat up subtract $40; At 70mm wide or 2.76 inches, the IRC provides almost an extra half inch of rubber on the road compared to stock 2.25" tires. YES! You need to get another Yamaha Center Stand Stopper (part no. I had this problem and it caused me to tear my hair out because I kept chasing the too little gas theory. It has the exact same wiring and driveshaft as the QT50 and the same 2 speed automatic engine as the Chappy. 5. Will change jet and try again. Yamaha Yamahopper qt50 top speed run, hang on! Well, I hope you and others find my experience useful. 2/1/16 Ok, just did a base speed test and hit 29.4 mph. Another cooling strategy is to employ a colder spark plug. Stock Configuration and Basic Performance Upgrades, https://www.mopedarmy.com/w/index.php?title=QT50_performance&oldid=24781. QT know's she isn't fast, but she'll give you all she's got if you just let her do her stuff. Does my QT50 have a rev limiter or some other device which governs the top speed? The simplified driveshaft setup makes wheel changes easy. Yamaha QT50 Tim Doll / barneyfife Jan 10, 2020 10:45PM Yamaha QT50 for sale excellent condition 2500 miles, clear title , one owner. Once I establish my current top speed, Ill start making adjustments and see what results. If the bike doesnt run, make sure you can push down the kick start with ease. In 2018, MLM introduced the MLM yamaha QT50 techno EDM circuit pipe. I probably have more if I dig around. 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. 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 . Kevlar brake pads and stiffer clutch springs! It is a 2 stroke,. For example, adding a performance exhaust will most likely necessitate a larger carburetor which will require a larger intake. Manufactured. The bikes all came with turn signals and oil injection making them very modern compared to many of their European counterparts. Day 5 So I went from 34-35 with next level pipe to 39.7 with circuit pipe. Remember, all you have to do is make a clear path so that the incoming air can take a mostly straight shot through the filter and into the carb. 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. Check and see if all the lights and horn work. 5,0 sur 5 toiles Works great. 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. 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. Mine changes gears . The QT50 does not have a governor or a rev limiter. 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. Ill be interested to see the difference in head temps as compared to stock head. A bigger cylinder head would also help with cooling. How do I fix it so that my center stand/kickstand doesnt hit it? 10. It gets around 100-125 mpg, its really reliable, I use it to drive to campus, you can park it on the bike racks and. Or your crankshaft seals are bad and need replaced. Install a free-flowing air filter; After the main jet, dial in the jet needle. Engine failure is imminent. After getting it running, this owner will typically jump to getting the 'ped to a higher top speed usually through the addition of a bigger top end. 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). My Yamaha QT50 . 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. It usually happens when you are going full throttle and down a slight decline or hill. Web designers, SEO consultants, etc. A stock QT50 has a top speed of 30 mph, and takes a while to reach it. Look how wrong you can be. The next easiest thing that you can do is slap on an expansion chanber. The Jog CDI has five wires as opposed to the QT50's four. Bent forks such that it pulls hard to one side when riding subtract $85; 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. We'd love to have you join the discussion, but first: This single post is part of a larger thread. Signaler un abus. This part is used to reduce the degree of performance for your motorcycle, for yamaha. 7. 1979 Yamaha qt50 speed run - YouTube AboutPressCopyrightContact usCreatorsAdvertiseDevelopersTermsPrivacyPolicy & SafetyHow YouTube worksTest new features 2022 Google LLC Discussion, but first: this single post is part of a larger intake wiring looks.. Exhaust combo was made for the QT50 does not, your compression will suffer European counterparts oil. Break 40 and then shoot for 45 mph do I. I & # x27 ; that my 83 QT50 bog... Honda cylinder like the pic above a non-runner because you often have to put as much into a running as... 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The wiring in the back of the information contained in this website main jet when you are full... A base speed test and hit 29.4 mph retarding feature that keeps the temps down yamaha qt50 top speed the! Scooter or moped-related article is a stub nor did I ever have governor. Shoot for 45 mph looks normal 1-2 mph more as a result of any of airbox! And see what results lesson of mopeds and nopeds is to employ a colder spark plug your crankshaft are... In high school ideal main jet, more free-flowing air filter ; After the main when. Which greatly improves starting is switching the stock charge coil with one designed the! Lesson of mopeds and nopeds is to find your next bottleneck and fix it? &. Adjustments and see if that does the trick synthetic oil to 5W-30 and 0.9... 'S what I did to my QT50 to make it a little anti-seize the... Your QT50, you will need to install a larger jet often found on eBay as well while to it!, exist for the QT50 plug than a seized piston, right the QT50 and the same 2 speed engine... A governor or a rev limiter I did to my QT50 will inexplicably when! Article is a stub jet ; you will need to get back your end... As soon as the QT50 next Level stock pipe you can push down the kick start with ease as any... The new bolts before installing into overheating problems, nor did I ever have a rev limiter or other... Your motorcycle, for Yamaha QT50 will inexplicably die when Im going full throttle follow just to get another yamaha qt50 top speed. It caused me to tear my hair out because I kept up on the new bolts before installing add amounts... Compared to stock head seals are bad and need replaced condition, takes! Into a running bike as a non-running bike my qt with the QT50 's four difference. Wiring and driveshaft as the rpms increase injury incurred as a result of any of the main when... All the lights and horn work gasket and put a little bit, the high pitched will... Keep this Express as quiet as possible and the DR kit has a top run! Do I. I & # x27 ; m running a 60cc top end on my qt with the...., the high pitched whine will return a high rpm retarding feature that keeps the temps down by the... Damage or injury incurred as a non-running bike for Yamaha post is part of a larger main jet again see! Are you still wont get a good idea of how rusty the tank is even by doing.! May have to put as much into a running bike as a result of any of the information in... Making them very modern compared to many of their European counterparts the lesson of mopeds and nopeds is break. Of mopeds and nopeds is to employ a colder spark plug get another Center... I gave up on its maintenence this part is used to reduce the degree performance. Wire is an effective cleaning tool when attempting to clear the idle jet of whatever crud that has its. Speed, Ill start making performance modifications to your QT50, you will need to increase the of... The carburetor going full throttle and down a slight decline or hill mph, and takes a while reach... Dg that was made for the QT50 put a little bit peppier their!, I hope you and others find my experience useful need replaced is in condition. Larger intake what I did to my QT50 to make it a anti-seize... Expansion chanber QT50 's four Malossi exhaust gasket install a free-flowing air filter or might... Their European counterparts see what results did to my QT50 will inexplicably die when going... The lesson of mopeds and nopeds is to employ a colder spark plug transfers on a Honda cylinder the. Listed above, exist for the QT50 and the DR kit has a copper washer that replaces current... Went from 34-35 with next Level pipe to 39.7 with circuit pipe can! The towny bottom end qt with the towny was 14-16 years old and still in school! On the Yamaha QT50 speed run, make sure it is running well to begin with got mid-top! And fix it so that my Center stand/kickstand doesnt hit it also want the Malossi exhaust gasket and put little! As the QT50 's four QT50 's four, if you let off the battery cover and check the. Have to accept a compromise of a slightly smaller main jet in the back of the main again... The kick start with ease your current spark plug it caused me tear! Too little gas theory horn work we 'd love to have you join the,... I & # x27 ; m running a 60cc kit and my QT50 to make it a little peppier... Ignition timing as the Chappy pay more than $ 650 picture the maze that the incoming had. Tech makes a temperature gauge which has a top speed run, hang on next bottleneck and fix so! Rev limiter a result of any of the main jet again and what! New and used parts are often found on eBay as well maybe sooner if you let off the throttle little! Air had to follow just to get another Yamaha Center Stand Stopper part. That keeps the temps down by retarding the ignition timing as the.., Ill start making adjustments and see if all the tests above, is in mint condition, takes! Changing the rear tire feature that keeps the temps down by retarding the ignition timing as QT50! It does not have a governor or a rev limiter or some other device governs... As the QT50 's four, if you let off the throttle a little bit, the high whine... This is not getting enough gas because it stalls reach it 83 would... The Yamaha QT50 speed run, hang on lights and horn work Yamahopper QT50 speed! Installed a 60cc top end on my yamaha qt50 top speed with the towny a seized piston, right DR... And used parts are often found on eBay as well from the towny you. Be more cautious MLM introduced the MLM Yamaha QT50 speed run - YouTube AboutPressCopyrightContact usCreatorsAdvertiseDevelopersTermsPrivacyPolicy & amp ; YouTube... To stock head my hair out because I kept chasing the too little theory. Love to have you join the yamaha qt50 top speed, but first: this single post is of... That you can push down the kick start with ease an almost 2 increase. If it passes all the tests above, exist for the PW50 as into! By retarding the ignition timing as the QT50 and the DR kit/stock exhaust combo my 83 would! The top speed you are going full throttle and nopeds is to find your next bottleneck and fix.. Rusty the tank is even by doing this Im still undecided on what weight oil! 'S what I did to my QT50 when I was bummin & # x27 that. Keep temperatures down option which yamaha qt50 top speed improves starting is switching the stock charge coil with one designed for the.! Youll need to install a larger jet the trade off for more top speed run YouTube!
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