";s:4:"text";s:24555:"No side covers and you really want them subtract $100-125; What you are really experiencing is the engine four stroking as a result of too much fuel in the combustion chamber. Check out the exterior of the carburetor. At the time it died out, it was still accelerating! 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. 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 . Or your crankshaft seals are bad and need replaced. Right and left side crankshaft seals can be found on ebay or treatland.tv. If you dont use a gasket or gasket maker, youll need a bigger main jet. Most likely they are the original tires with 4000-5000 miles on them. What should you pay for (or sell) a Honda Express? And cylinder got sanded down after 1.5mm of spacers added to open up all ports fully except intake at BDC. I was reading the service manual for the NC50 and saw that it called for 10W-40 transmission oil in the summer and 5W-30 in the winter. New tires may be in store for you as well. Crankshaft bearing seal replacement on mj50, qt50 and pw50. 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. I meant to look but kept forgetting but she doesnt start to hook up till low 30s. The Yamaha QT50 Yamahopper was produced by the Yamaha Motor Company from 1979 through 1992. This motorcycle, scooter or moped-related article is a stub. Thanks to this handy calculator, I see that my speed at 30 mph with the old rear tire should now be 31.53 mph. Now the air can flow in from the back of the airbox, straight through the filter and into the carb. 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. You want to keep an eye on the temperature of the engine so that you dont seize the piston. I learned it well as I rode my QT50 when I was 14-16 years old and still in high school. QT know's she isn't fast, but she'll give you all she's got if you just let her do her stuff. I also had the head milled professionally at a local machine shop by a small amount, but I didn't want to accidentally overdo it and end up running premium and octane booster. Overheating and piston seizure are traps for the unwary. We are ready to rock as soon as the weather cooperates. If your finger is forced off, the bike may have decent compression. Trail Tech offers a 14mm gauge for $39 or so. Compression was low (110 psi) until I put the stock head back on and removed the head gasket (135 psi now). A cone, mesh or pod air filter will also help with excessive four stroking. Ill continue this list over time because there is a lot you can do to go faster on a qt50. $44.99 $ 44. 3.8 out of 5 stars 64. Jetting is lean so gotta change that and couldnt really go full throttle for too long as temps got hot. 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. Ive added a video on this modification here at the bottom of this page. I solved it by going from a 102.5 jet to an 87 and finally to an 85 main jet. (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!!) A stock QT50 has a top speed of 30 mph, and takes a while to reach it. So I can compare temps between stock head and puch head. Try a hotter spark plug; Yamaha QT50 Tim Doll / barneyfife Jan 10, 2020 10:45PM Yamaha QT50 for sale excellent condition 2500 miles, clear title , one owner. For every 1 mph below top speed of 30 mph, subtract $15-20; Jan 09, 2023 08:37PM. Ill up my main jet. Depending on the kit, consider shutting down if you start to approach 400F. 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. Wiring issues subtract $100; Your engine should four stroke some so that you know you have achieved this balance. Four-stroking is common to stock QT50s, and the resulting loss of acceleration at 25 mph or so has led many to mistakenly believe that a rev limiter exists somewhere on the bike. Yamaha's conservative approach leads us to our first performance upgrades. Yamaha gave the QT50 a main jet that was too rich and an air filter that was too restrictive. The original tire size on the qt50 is 2.25 wide by 14 in diameter. They just need to make the cylinder "breathe" better at mid/high RPM. Theres a lot more flow now. Last edited on 22 November 2022, at 05:58, "Retrospective: 1979-1992 QT50 Yamahopper | Rider Magazine", https://en.wikipedia.org/w/index.php?title=Yamaha_QT50&oldid=1123157659, This page was last edited on 22 November 2022, at 05:58. Im still breaking it in and have encountered and overcome several hurdles already. Swap in a slightly smaller main jet, a less restrictive air filter or both. New cylinder head. Ive got several other ideas but will reveal them one by one as I make progress from test to test. A popular choice is the IRC NR-77 moped tire: 14 x 70/90. My original plan was to keep this Express as quiet as possible and the DR kit has a reputation for being loud. Stay tuned. If they are very stubborn then hit it with PB-Blaster and let them sit overnight. Signaler un abus. Stay tuned. Reply Stephen Keller / keller_stephen Jan 10, 2020 11:49PM Price? Im also running it without a head gasket after shaving the cylinder head flat. This is my yamaha qt-50, its a 49.9cc scooter with a top speed of 32mph. Look how wrong you can be. 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. Other thoughts include installing an even bigger carburetor, installing a new top end, adding performance reeds, etc. 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! Available at Brennys Motorcycle Clinic in Bettendorf, Ia. This headlight has a replaceable bulb and fits perfectly in the QT50's headlight ring. The next easiest thing that you can do is slap on an expansion chanber. The other 2 wires are power for lights or battery. 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. Yamaha MJ50 Towny two-speed crankcase and right-side swingarm. To combat this, many riders have eliminated the oil pump and replaced it with an oil plate block-off or an automotive freeze plug. You need to get another Yamaha Center Stand Stopper (part no. Do not use the entire oil package that comes with it to oil the filter. The lesson of mopeds and nopeds is to find your next bottleneck and fix it. Install a new and bigger rear tire. QT50s were popular in the late 1970s and 1980s, These small motorcycles are easy to ride, maintain, and are fuel efficient. Im going to look at changing the jetting next. To see our full inventory go to brennys dot com. The downside to this option is that you'll have to go the next size up on the main jet in your carb or you'll run it lean and seize the engine. Traduire le commentaire en franais. 2. 2/8/19 Ok, I gave up on the DR kit/stock exhaust combo. The content producer assumes no liability for property damage or injury incurred as a result of any of the information contained in this website. The PuchHonda cylinder head gave me troubles sealing so I have the stock head back on. I achieved a top speed of 39.7mph which I consider amazing on a stock cylinder. A larger carburetor may even be a better choice than the stock carburetor with a larger jet. 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 crankshaft bearing seals are often overlooked by the new QT50 owner but should be the primary focus of his or her attention. 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. The idea behind this was to eliminate the airflow restriction inherent to the design of the airbox itself. Low end was miserable at 110 psi. I used a 65 main jet and it seems to be pretty dialed in. Call 563-359-7222. JP. As above, a cheap aftermarket 6 volt flasher is easily attained. But no worries. You can help Wikipedia by expanding it. [1] The QT50 motorcycle resembles contemporary Mopeds and shares some features with Scooters. The oil pump, slide spring and junction box all provide tension to snap the throttle back after you let go. 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. You may also choose to richen up your jet needle by moving the clip down one or more positions. 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. Current set up is vm18 carb, 65 main jet, mlm next level pipe, pw gears, 16 rear tire, 1.0mm spacer. All this is necessary to avoid seizing your piston as the performance exhaust will have the effect of leaning out your fuel/air mixture. Half the package or less is plenty. Fuel also serves the purpose of cooling the engine so more fuel means more cooling. 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). Im currently running 10W-40 conventional oil and I think I notice some drag on cold days. 41.6mph. Install a free-flowing air filter; Spring is always the hot season for noped and moped sales. This simply means that as you upgrade one component, you have probably created a bottleneck somewhere else. The engine doesnt need the extra fuel because its under no load or a very small load. 4. Removing the oil injection gear will not result in any noticeable amount of overall speed or power. Yamaha may have intended that the bike run rich to promote engine life. It has a 15.15 SHA clone carb and currently running a 75 main jet. QT50 Oil injection removal - An oil injector block off plug can be found if you choose to go to premixed fuel. Top speed without an extended full throttle run of 34-35. 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. If you lose the oil pump, you also lose some of that snap-back tension. 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. If I recall correctly, my QT50 topped out around 31 on level ground w/ no headwind after this mod alone. The bikes all came with turn signals and oil injection making them very modern compared to many of their European counterparts. My Yamaha QT50 . 6. Perhaps Yamaha reasoned: 'tis nobler to foul a spark plug than to seize a piston. Will change jet and try again. I just installed a 60cc kit and my qt50 will inexplicably die when Im going full throttle? Anything goes only rule is keep the 49cc engine. I can bump the main jet again and see if that does the trick. Yamaha Yamahopper qt50 top speed run, hang on! Expect a top speed gain of at least 10% over stock with this modification. In its factory form, the Yamaha QT50 should reach a top speed of around 28-30 mph. 35-36 is about limit with next level pipe and 49cc. You may need to bump up to a 72.5 main jet with this filter. this setup is perfect for gaining some top speed and torque, but still having a quiet-ish bike that isn't over stressed. On a large ride, I was able to keep up with the Puch's and Carabela's. 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. In 2018, MLM introduced the MLM yamaha QT50 techno EDM circuit pipe. Chances are your tires on your 35 or so year old qt50 are a mess. A temperature gauge is mission critical to keeping your piston from soft seizing. 99. I got a mid-top end pipe from DG that was made for the QT50. dead battery subtract $25; The YF60's(quad), YT60's(atv), MJ50's, and PW50's (dirtbike) engines were all derived from the QT50's engine and all parts are interchangeable though some parts are slightly different, for example all model's right side crankcase half have right side trailing arm mounts, except for the QT50. 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). Now my former paperweight had a new lease on life. Although branded as a front tire, it will work on both the front and rear of the QT50. A too lean mixture can cause serious engine damage. Wiring explanation follows: QT50 Tire options - A taller and wider tire will improve handling, ride, braking and, potentially, top 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. Sellers like to advertise their bikes as ran when last parked or just needs a carb clean or just needs tune-up. If you eliminate all four stroking, you may run the risk of seizing your piston. QT50 rear shock options - Just about any 320mm mono shock will work to replace the stock shock. 4. 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. Re: I got manuals for yall on the net for FREE. Bike parts will be a little tougher, but there are plenty still on the used market. What follows are my attempts to obtain the best performance from the stock 49cc Yamaha qt50 engine. 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). We'd love to have you join the discussion, but first: This single post is part of a larger thread. Also check the foot pegs to see if they are bent. 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. You need one with the eyelet at the top and the clevis end at the bottom. It still has the stock exhaust which may be a huge limiting factor. Took a ride with current setup as listed above. 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. Shine the light into the gas tank and determine how rusty the inside of the tank is. Im located in Ohio. You may have to accept a compromise of a slightly larger than ideal main jet in order to keep temperatures down. 6. Re: 1982 Yamaha QT50 Yamahopper top speed. New bolts with some anti-seize compound are recommended. I probably have more if I dig around. Thats an almost 2 mph increase by just changing the rear tire. I had cyclekeysonline make me a $10 key for it and it worked. 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. Noped Thursday 2.03K subscribers Subscribe 3.7K views 4 years ago Some further tweaks yet but 49.1 mph. 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); Both front and rear brakes become weak points when top speeds near or surpass 40mph. Yamaha QT50 Cables & Brackets. a video on this modification here at the bottom of this page. Replacement of its gasket can be undertaken or a cheap aftermarket fuel cock can be had with little trouble. 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. Web designers, SEO consultants, etc. So if my qt50 can spin the taller tire at the same revolutions per minute my speed should increase. Many mistake the low, rough growl as a result of a rev limiter residing in the CDI unit or perhaps elsewhere. 1979 Yamaha qt50 speed run - YouTube AboutPressCopyrightContact usCreatorsAdvertiseDevelopersTermsPrivacyPolicy & SafetyHow YouTube worksTest new features 2022 Google LLC 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. 8. To see our full inventory go to brennys dot com. 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. Home. To get the old bolts out (if they are rusty), you can try to gradually work them out by slightly loosening and then tightening them. I thought the stock exhaust might help in this regard. 9. ma 50 M Ne completa Junta Conjunto 998030 Yamaha QT50 1979-1987. 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 bigger carburetor will provide better cooling for your larger top end. Or adding a bigger top end will require other modifications in order to achieve the potential of the new top end. So, in essence, it would be getting too little fuel. > Hey, so do I. I'm running a 60cc top end on my QT with the Towny bottom > end. I've found 9 and 10 plugs in the NGK BHS plugs (a shorter plug run with the Malossi kit). Needs both tires subtract $95-105; Headlight doesnt work subtract $45; Although unlikely that any significant difference exists, the straighter version contributed more to performance than the "S" shaped version. Ok, I changed the transmission oil to 5W-30 and lost 0.9 mph. 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. The Mikuni VM18 carb is almost as lethal as nitrous. For example, adding a performance exhaust will most likely necessitate a larger carburetor which will require a larger intake. QT50s and other mopeds are enjoying a resurgance in popularity due to their fuel efficiency and nostalgic appeal. The stock main jet in a qt50 is a 70. I had these 3 mods done to my QT50 and it really enhanced my enjoyment of riding it around during the summers. It goes into full retard - meaning that the ignition timing is fully retarded at all rpm - not something you want. Ill put the circuit pipe on next and we should jump to over 40. This page was last edited on 13 January 2018, at 17:44. The Yamahopper has an approximate top speed of 30 mph in stock form, and thus can be used for city driving. 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. You dont want to break the head off either of these bolts or you will have to drill out the old stud or replace the cylinder jug. 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. However, this 5 wire box DOES NOT work for the Sting. 2 stroke engines are designed to four stroke in certain situations. Be nice to her. There really isn't a governor on these bikes, they just run as fast as they can given the intake/exhaust setup that Yamaha gave them. Yamaha Qt50 Gauge Cluster Speedometer Moped Ignition With Keys Yamahopper 1980 on 2040-parts.com US $99.99 Location: Flatwoods, Kentucky, United States Your Name Your Email Your Phone Place Order Condition: Used Warranty: No Up for sale is a speedometer and ignition switch with two keys from a 1980 YAMAHA QT50 YAMAHOPPER. The VM18 will require MLM's intake designed for the VM18. If anything, Id try a 66 main jet next. This filter will allow the engine to get more air. Both carburetors will require you to switch from the oil injection to using premixed fuel although a Dell'Orto SHA can be found with an oil injection inlet. 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. In stock configuration, the QT50 will hit about 29-30 mph. Web designers, SEO consultants, etc. Motion Pro Rubber Sleeve (11-0045) 0 # mpn4565891373. Kevlar brake pads and stiffer clutch springs! $650 in Ohio may be the same as $900 in California or New York. It's uncommon to find an example of the QT50 with the side covers that go on either side of the stock air box. Some have installed the HPI CDI mini rotor ignition system for yamaha QT50. Mikuni VM15 and VM18 carburetors. 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. ";s:7:"keyword";s:21:"yamaha qt50 top speed";s:5:"links";s:835:"Pablo Escobar Brother In Law Carlos,
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