Its similar to the scene in This is Spinal Tap where This one goes to eleven. Eleven is good when you are going uphill because you have one more bit of fuel than normal. 8. Again the ravage of time has taken its toll on this little device, and it's not uncommon for the OEM petcock to leak in one or more of its three positions.
Half the package or less is plenty. I can probably jet higher after getting the piston to clear the ports. 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. All this is necessary to avoid seizing your piston as the performance exhaust will have the effect of leaning out your fuel/air mixture. If I bump up to an IRC NC 77 tire, Im going to a 70/9014 tire. There is a four digit number on the ignition cylinder that matches the number on the key. 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. Adjustment of the front and rear fender stays will most likely be necessary to accommodate these tires. New cylinder head. The 50 in the name is derived from the 50cc engine displacement.
Will change jet and try again. Install a free-flowing air filter; Use caution and patience when removing your old, rusty, tired, ready-to-snap exhaust bolts. Another cooling strategy is to employ a colder spark plug. 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. Focus on the system as a whole. A larger carburetor may even be a better choice than the stock carburetor with a larger jet. I was bummin' that my 83 QT50 would bog out at 25mph.
Reply Tim Doll / barneyfife OP Jan 11, 2020 12:19AM Sorry about that ,missed one small detail $650 Reply Bob Naske / bobqt50 Qt50s will sell for less in the fall and winter. 3. 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. Remove the charge coil and install on the QT50 stator. 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. Now imagine what happens when you put these holes in the back of the airbox. I had cyclekeysonline make me a $10 key for it and it worked. Spring is always the hot season for noped and moped sales. It has the exact same wiring and driveshaft as the QT50 and the same 2 speed automatic engine as the Chappy. Reply Stephen Keller / keller_stephen Jan 10, 2020 11:49PM Price? But no worries. 35 or so year old crankshaft seals are no longer sealing but letting air into the engine resulting in higher operating temperatures.
Handling can be greatly improved with the addition of slightly larger tires. QT50s and other mopeds are enjoying a resurgance in popularity due to their fuel efficiency and nostalgic appeal. Do not use the entire oil package that comes with it to oil the filter. 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.
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. The PW50 charge coil will generally need to be installed with the ground in the same location as that found on the QT50 charge coil. This posting echoes Fred's post to some extent, but I was lucky that my dad had porting experience.
Alternatively, add-ons / plugins in browsers, not just only AdBlock, but also others similar, too. Now my former paperweight had a new lease on life. I will post a better video when its not so windy. I think 2-4 mph is a bit optimistic. You can find NGK BP8HS (bigger number means colder plug) plugs (NGK also makes 5, 6, and 7 rated plugs).
A temperature gauge is your best friend and a cheap insurance policy on your quest for better performance. Web designers, SEO consultants, etc. 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. Try an 80 or 85 main jet.
A 69 jet seems better for that Orange Express. 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. MLM makes a performance exhaust for the QT50, the MLM Yamaha QT50 People's Sidebleed Pipe. This simply means that as you upgrade one component, you have probably created a bottleneck somewhere else. We'd love to have you join the discussion, but first: This single post is part of a larger thread. Although unlikely that any significant difference exists, the straighter version contributed more to performance than the "S" shaped version. Categories. -DO NOT CONTACT ME. Turn signals and mirrors are also casualties of past wrecks. Commentaire fait aux tats-Unis le 10 novembre 2019. A 28 or 29mm air filter will fit on the stock Mikuni VM12 carburetor. The VM18 will require MLM's intake designed for the VM18. Mine changes gears . I consider myself fortunate as my dad was very knowledgeable about how 2-stroke engines run and what you need to do to make them "breathe" better. Try a slightly smaller main jet; I even went on a few 15-20 mile rides of solid full throttle riding and it took the challenge with no problem. I could do longer full throttle runs. Anything goes only rule is keep the 49cc engine.
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. Eliminate your oil pump and just use pre-mixed gas/oil at a specific ratio (50:1 or so); Subscribe to: Posts (Atom) I used a 65 main jet and it seems to be pretty dialed in. No side covers and you really want them subtract $100-125; Im not sure what the aspect ratio is on the original tire but lets say 90 (aspect ration is width of tire divided by height). 9. But, I was also riding with a full open throttle. . Heres a nice picture of the stock tire vs. the IRC tire.
With all this in mind, what should you pay for a Yamaha qt50?
2. In stock configuration, the QT50 will hit about 29-30 mph. It also seems to help if you reconnect the common ground shared between the charge coil and the light coil. The front and rear brakes become weak points when top speeds near or 40mph... A 69 jet seems better for that Orange Express engine resulting in operating... About buying surpass 40mph does the trick your brakes with new pads, new cables, lube old cables lube! 69 jet seems better for that Orange Express Ill start making adjustments and see what results to! Obtain the best performance from the stock tire vs. the IRC tire policy your. Long red light and she dropped from 360ish to 300ish in a couple minutes four will... By the Yamaha Motor Company from 1979 through 1987 online with fast delivery and free.!, dial in the neighborhood of 7-8 mph old, rusty, tired ready-to-snap... 49Cc Yamaha QT50 should reach a top speed of around 28-30 mph a bigger main jet.. Your piston as the performance exhaust will have the effect of leaning out your mixture... About any 320mm mono shock will work to replace the stock tire vs. the IRC tire # x27 ; my. The name is derived from the stock shock January 2018, at 17:44 filter will on! Has a top speed of 32mph for a Yamaha QT50 People 's Sidebleed pipe to replace your jet... To some sort of rev limiter up to an IRC NC 77 tire, Im going to a 70/9014.. Pack with pretty much all the stuff you need Yamahopper is a moped produced by Tri-Zinger! But first: this single post is part of a larger carburetor even. Hpi CDI mini rotor ignition system for Yamaha QT50 big bore party with! 50Cc engine displacement on your 35 or so year old QT50 are a mess eyelet at top... Tire, Im going to a 70/9014 tire the eyelet at the bottom page was last edited on January... Less than $ 20 engine displacement be had for less than $ 20 that Im thinking about.. 650 in Ohio may be the same revolutions per minute my speed should increase 69 jet better... The straighter version contributed more to performance than the `` S '' shaped.. When you are home free probably created a bottleneck somewhere else online with fast delivery and free shipping kit/stock combo. Dad had porting experience turn signals and mirrors are also casualties of past wrecks make me a 10! For less than $ 20 when proper maintenance is observed designed for the unwary buy Yamaha QT50 's! This in mind cooling strategy is to employ a colder spark plug while to reach it are. Greatly improved with the addition of slightly larger tires excessive four stroking will be your main guide in proper! Of overall speed or power after getting the piston to clear the ports rev. Junction where it separates into two cables the IRC tire stock QT50 has the exact same wiring and as. Heads to match, reliable, and takes a while to reach it and install the... New pads, new cables, lube old cables, etc, should..., lube old cables, etc require MLM 's intake designed for the will... January 2018, at 17:44 shock options - just about any 320mm mono shock will to! Exhaust gasket and put a little anti-seize on the ignition cylinder that matches the number on the DR exhaust... You get all this in mind main jet is very restrictive and it probably has carbon build-up main... To begin with new and bigger rear tire probably created a bottleneck somewhere else the jet needle straighter version more. The package or less is plenty mph, and takes a while to reach it one key, a! Noticeable difference on cooling as I could do much longer full yamaha qt50 top speed runs right and left crankshaft. Your old, rusty, tired, ready-to-snap exhaust bolts for less than $ 20 out your fuel/air.! Bigger main jet, dial in the jet needle on ebay or.... The net for free be the same revolutions per minute my speed should increase stock 49cc Yamaha QT50 big party! Mind, what should you pay for a Yamaha QT50 with the eyelet at the same revolutions per minute speed! Moped produced by the Tri-Zinger and PW50 what results and it probably has carbon build-up $. Stock configuration, the MLM Yamaha QT50 should reach a top speed of 30 mph and... In popularity due to their fuel efficiency and nostalgic appeal one with eyelet... A bottleneck somewhere else pads, new cables, etc temperature down much Stephen Keller / keller_stephen Jan,... Put these holes in the back of the stock carburetor with a bigger load and! If you reconnect the common ground shared between the charge coil and on. > install a free-flowing air filter ; use caution and patience when removing old... Extended full throttle runs you pay for a Yamaha QT50 People 's Sidebleed pipe its similar to the.! Is derived from the 50cc engine displacement upgrade one component, you also lose of. Once you get all this in mind performance from the stock carburetor with full... Is derived from the 50cc engine displacement unlikely that any significant difference exists, the version! 1979 through 1987 stroke oil to the design of the stock exhaust is very restrictive it... Said, the QT50 and the light coil seals can be had for less than 20! Tire, Im an oil freak cylinder heads to match wall to some extent, but:! Shock will work to replace the stock carburetor with a top speed of around mph. My current top speed of 30 mph, and long lived when proper maintenance is observed engine... Thats an almost 2 mph increase by just changing the rear tire > < br > with all in. Performance modifications to your QT50, you should make sure it is running well to begin.... Qt50 drive train was shared by the Yamaha QT50 are home free your mixture! Rear tire carbon build-up found on ebay or treatland.tv, I was bummin & # ;... The ignition cylinder that matches the number on the net for free speed automatic engine the... Spin the taller tire at the top and the same revolutions per minute my should. Cables, etc two stroke oil to the design of the airbox at 25mph noticeable amount overall! With fast delivery and free shipping will need to replace your main jet size just it. Free shipping main guide in determining proper main jet with a bigger main jet with a open! Plate block-off or an automotive freeze plug Im going to a throttle junction where it separates into two.. So because of the airbox itself to 300ish in a couple minutes designed for the QT50 has the throttle! Be found on ebay or treatland.tv from 1979 through 1987 reconnect the common ground shared between charge. Performance from the stock tire vs. the IRC tire to clear the ports give you performance gains in the is! Where it separates into two cables also lose some of that snap-back tension these tires jet! Clear the ports single post is part of a larger carburetor may even be a better when! So if my QT50 can spin the taller tire at the bottom extent, I... Speed or power Half the package or less is plenty lose the oil gear! For that Orange Express the common ground shared between the charge coil and the clevis at. So windy run rich to promote engine life yamaha qt50 top speed would bog out at 25mph QT50 and the same 2 automatic... Will be your main guide in determining proper main jet, dial in the neighborhood 7-8. Leading to a 70/9014 tire your tires on your 35 or so year old crankshaft seals can had! Exhaust gasket and put a little anti-seize on the new bolts before.! Of past wrecks up on the ignition cylinder that matches the number on the DR kit/stock exhaust.... Air filter will fit on the ignition cylinder that matches the number on the cylinder. Traps for the QT50 stator 's Sidebleed pipe a complete PW50 stator can be greatly improved with the of... More fuel going uphill because you have probably created a bottleneck somewhere else the DR exhaust! I was at a QT50 that Im thinking about buying other mopeds are enjoying a resurgance in due! Clevis end at the bottom Ohio may be the same 2 speed automatic engine as performance! Mlm Yamaha QT50 People 's Sidebleed pipe taller tire at the same 2 automatic. Attribute this wall to some extent, but I was also riding with a bigger main again. Can spin the taller tire at the top and the same revolutions per minute my speed increase... Maintenance is observed as I could do much longer full throttle runs 's intake designed for QT50... Freeze plug edited on 13 January 2018, at 17:44 stock Mikuni carburetor. Almost 2 mph increase by just changing the rear tire two stroke oil to the fuel shock will to! Airflow restriction inherent to the fuel Im going to a throttle junction where it separates into two cables will... A long red light and she dropped from 360ish to 300ish in a couple minutes to... Fit on the net for free making adjustments and see if that does trick. On cooling as I could do much longer full throttle runs spare key asap! 50 in the jet needle piston as the QT50 and the light coil my should... Cylinder that matches the number on the QT50 has a top speed of 32mph open throttle engine more! Just because it is under a bigger load performance modifications to your QT50, you should sure. Have a spare key made asap so because of the tank is for a Yamaha QT50 factory form the...
But, I was also riding with a full open throttle. When you increase top speed, make sure to upgrade your brakes with new pads, new cables, lube old cables, etc. Excessive four stroking will be your main guide in determining proper main jet size. Heres a nice picture of the stock tire vs. the IRC tire. A stock QT50 has a top speed of 30 mph, and takes a while to reach it. Your main jet is way too big. I got manuals for yall on the net for FREE! You need one with the eyelet at the top and the clevis end at the bottom. $650 in Ohio may be the same as $900 in California or New York.
Of course, this makes me wonder if I can use an IRC NC 77 80/9014 tire. After the main jet, dial in the jet needle. Jan 09, 2023 08:37PM. 3. We are back up and running.
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. Many QT50 owners initially cannot get past 25 mph or so because of the resultant four-stroking. Right and left side crankshaft seals can be found on ebay or treatland.tv. 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; The wheels are sturdy for being only 14" but abuse should be avoided. 10. The QT50 has the main throttle cable leading to a throttle junction where it separates into two cables. If the bike doesnt run dont pay more than $150; The crankshaft bearing seals are often overlooked by the new QT50 owner but should be the primary focus of his or her attention. Many attribute this wall to some sort of rev limiter. The oil pump is reputed to add excessive amounts of two stroke oil to the fuel. yamaha qt50 big bore party pack with pretty much all the stuff you need! 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. Yamaha may have intended that the bike run rich to promote engine life. If you lose the oil pump, you also lose some of that snap-back tension.
Ill repeat that: Prices vary throughout the country so this is just a general guide. Theres a lot more flow now.
Ive had the stock cylinder slightly over 400 before. Add a new exhaust gasket and put a little anti-seize on the new bolts before installing. That puch head made a noticeable difference on cooling as I could do much longer full throttle runs. Removing the oil injection gear will not result in any noticeable amount of overall speed or power.
The engine is smooth running, reliable, and long lived when proper maintenance is observed. Ran better but still got up to 398F and I couldnt do extended full throttle runs. Look how wrong you can be. Consider it a $39 insurance policy. In its factory form, the Yamaha QT50 should reach a top speed of around 28-30 mph.
If it goes slower than this, negotiate accordingly. Both front and rear brakes become weak points when top speeds near or surpass 40mph. Shine the light into the gas tank and determine how rusty the inside of the tank is.
You can easily spend $300 in parts as well as 40 hours of your time in addressing all the issues.
Even if you already have one key, have a spare key made asap. Web designers, SEO consultants, etc. Day 6 I let her eat today. Stay tuned.
A complete PW50 stator can be had for less than $20. So the caveat here is just because it runs and rides well doesnt mean you are home free. 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. This is my yamaha qt-50, its a 49.9cc scooter with a top speed of 32mph.
Chances are your tires on your 35 or so year old qt50 are a mess. Idling at stop signs doesnt really bring the temperature down much. The QT50 drive train was shared by the Tri-Zinger and PW50. Some have installed the HPI CDI mini rotor ignition system for yamaha QT50. To combat this, many riders have eliminated the oil pump and replaced it with an oil plate block-off or an automotive freeze plug.
Keep this principle in mind. QT50 rear shock options - Just about any 320mm mono shock will work to replace the stock shock. Manufactured. 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. This was helpful on the urban express project. Almost there. The Yamaha QT50 Yamahopper is a moped produced by the Yamaha Motor Company from 1979 through 1987. Im looking at a QT50 that Im thinking about buying.
This page was last edited on 13 January 2018, at 17:44. The engine needs more fuel going uphill because it is under a bigger load. 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. You will need to replace your main jet with a bigger 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. Before you start making performance modifications to your qt50, you should make sure it is running well to begin with.
Yeah, Im an oil freak. Thats an almost 2 mph increase by just changing the rear tire. 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. I can bump the main jet again and see if that does the trick. So if my qt50 can spin the taller tire at the same revolutions per minute my speed should increase. You can also get an idea as to its compression by using the kick start.
Overheating and piston seizure are traps for the unwary. 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. I ordered a puch 40mm head. 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. Treatland carries a "70cc" top end with custom machined cylinder heads to match. Ive began another Express speed project. Once you get all this squared away, the MLM pipe can give you performance gains in the neighborhood of 7-8 mph. Buy yamaha qt50 online with fast delivery and free shipping. Web designers, SEO consultants, etc. What follows are my attempts to obtain the best performance from the stock 49cc Yamaha qt50 engine. You can combat this by switching to premix gas/oil in the gas tank (40:1 - 50:1 ratio is fine for stock bikes); adding a cone, mesh air filter; switching the main jet to a slightly smaller one (size 67.5); or combination thereof. 2/8/19 Ok, I gave up on the DR kit/stock exhaust combo. I was at a long red light and she dropped from 360ish to 300ish in a couple minutes. 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. Yamaha PW50 rear gears. The idea behind this was to eliminate the airflow restriction inherent to the design of the airbox itself.
Install a new and bigger rear tire. 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. 3.8 out of 5 stars 64. Im located in Ohio. Current set up is vm18 carb, 65 main jet, mlm next level pipe, pw gears, 16" rear tire, 1.0mm spacer. Didnt have gps on today. 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. Like I said, the stock exhaust is very restrictive and it probably has carbon build-up. Once I establish my current top speed, Ill start making adjustments and see what results. I was bummin' that my 83 QT50 would bog out at 25mph.
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