[1] The QT50 motorcycle resembles contemporary Mopeds and shares some features with Scooters. 10. That is just not going to work well. Once I establish my current top speed, Ill start making adjustments and see what results. Ill continue to work with it before trying a different exhaust. Home. The VM18 will require MLM's intake designed for the VM18. yamaha qt50 big bore party pack with pretty much all the stuff you need! 1. 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. Check the header on your exhaust and determine whether it is an "S" shape between the flange and silencer or more of a straight shot between the two. Yamaha qt50 jump to light speed - YouTube Ha ha ha. Day 3 I put a bigger pilot jet in the blue Qt. The following is a guide of some sorts of what CAN and CANNOT be used while restoring this guy It CAN use the same Shock as the QT50 It CANNOT use the QT50 crank It CANNOT use the Chappy crank It CAN use the same CDI magneto as the QT50 It is considered a motorcycle by most states. The engine needs more fuel going uphill because it is under a bigger load. Next, hold a finger over the spark plug hole and have a friend kick start the bike. Chances are those old exhaust bolts are super rusty. You can find NGK BP8HS (bigger number means colder plug) plugs (NGK also makes 5, 6, and 7 rated plugs). Ive added a video on this modification here at the bottom of this page. 2 stroke engines are designed to four stroke in certain situations. 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. Yamaha has tuned the engine to do this in that situation and it represents a compromise. 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. QT50s were popular in the late 1970s and 1980s, These small motorcycles are easy to ride, maintain, and are fuel efficient. I treat all these as non-runners. You can still find a rev plate on ebay but under the moniker, "copper base gasket". Top speed of 28.5. The next easiest thing that you can do is slap on an expansion chanber. Look how wrong you can be. If it passes all the tests above, is in mint condition, and has title, I wouldnt pay more than $650. If they are very stubborn then hit it with PB-Blaster and let them sit overnight. 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. Traduire le commentaire en franais. Many mistake the low, rough growl as a result of a rev limiter residing in the CDI unit or perhaps elsewhere. The puch head keeps her cool. 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. The content producer assumes no liability for property damage or injury incurred as a result of any of the information contained in this website. If it doesnt pass all the tests above, subtract as follows: Very rusty gas tank requiring replacement $80-100 deduction; As mentioned above, the stock main jet (size 70) and the oil injector cause an overly rich and wet (too much oil) condition. Titled and ready to go. That extra bit of fuel that causes some four stroking is required by the engine when it is under greater loads like climbing hills, running into a strong wind, etc. What a ride it was! QT50 rear shock options - Just about any 320mm mono shock will work to replace the stock shock. I used a 65 main jet and it seems to be pretty dialed in. Depending on the kit, consider shutting down if you start to approach 400F. This is not a moped since it doesnt have pedals. Ill make videos of each top speed run and post them here. A combination of the above. Makes me wonder how anyone could really go fast with a stock head. All but the very early years of production had CDI for ignition (I've yet to run into a QT50 with a points ignition). This was helpful on the urban express project. 6. Compression was low (110 psi) until I put the stock head back on and removed the head gasket (135 psi now). Jan 09, 2023 08:37PM. 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. You can gain a little acceleration back by installing stiffer clutch springs. 40.1mph. If you dont use a gasket or gasket maker, youll need a bigger main jet. Ive got several other ideas but will reveal them one by one as I make progress from test to test. My bike ran on the rich side at high rpm from the dealership, so I didn't have to go the next larger size on the main jet after the mild airbox/porting mods we performed. The header on my stock exhaust is kind of beat up so Im running a double exhaust gasket to seal it up. The oil pump, slide spring and junction box all provide tension to snap the throttle back after you let go. Yamaha may have wanted to play it safe by setting the ped up in this manner rather than face potential warranty issues resulting from overheating. New cylinder head. Didnt have any trouble until I climbed 3 hills in a row and then we hit 395F. It has a 15.15 SHA clone carb and currently running a 75 main jet. Although branded as a front tire, it will work on both the front and rear of 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). Ill up my main jet. 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. JP. 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. Popular modifications include: Yamaha YT60 cylinder, piston and rings. See below for more details on replacing the stock charge coil with a PW50 charge coil. Such puny gains are not going to satisfy your QT50 fanatic. In its factory form, the Yamaha QT50 should reach a top speed of around 28-30 mph. 4. These are awesome mopeds, they don't weigh a lot so they are nimble, being a moped it's legal to park anywhere a bike can (including bike racks), goes about 30 mph with a twist. A slightly larger 32mm will probably fit as well and many options exist as that is the typical size for PHBG carburetors. Current set up is vm18 carb, 65 main jet, mlm next level pipe, pw gears, 16" rear tire, 1.0mm spacer. 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. Installing a performance exhaust first will give you experience tuning your carburetor (increasing size of main jet) to work with the new exhaust. 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. $44.99 $ 44. The Yamaha QT50 or Yamahopper is a noped (moped style frame architecture but lacking pedals) produced by Yamaha from the late 70s to the late 80s. Rusty tanks can also be cleaned up and made to work. Get an aftermarket mesh air filter. You may also choose to richen up your jet needle by moving the clip down one or more positions. I probably have more if I dig around. Ive had at least two qt50s with bald back tires. Waiting on puch head to arrive. Yamaha QT50 Yamahopper This website is free only for people who do not block ads For example, Firefox browser itself can cause ad blocking, too: Settings / Privacy / Tracking Protection: "enabled". I got a mid-top end pipe from DG that was made for the QT50. Reply. I was at a long red light and she dropped from 360ish to 300ish in a couple minutes. The qt's metal tank can become rusty over time and especially if stored with gas in the tank. I go over some pretty simple cylinder modifications to get more speed.spacers - https://www.treatland.tv/SearchResults.asp?Search=honda+metal+spacer+basespac. The bigger rear tire is heavier and your qt50 in stock form may not be able to spin it at the same rpms as the original tire. This cut down on the brake bill dramatically. My Honda Express at the time of purchase. Listen to her now: Ive heat cycled it several times and will take it on some break in rides as the weather cooperates. Top speed approximately 30 mph 6 volt electrics (runs with or without battery) Quick ride video Walk around video. You can also get an idea as to its compression by using the kick start. Categories. This leads to hacking into the wiring. Future topics to be covered: 6. Yamaha used two different stock exhausts on the QT50. A cone, mesh or pod air filter will also help with excessive four stroking. 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. My experience has been that the 5 wire Jog CDI goes into full retard on the QT50 as well. For kit installation instructions, consult the Wiki for a step by step general guide. 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. Consider it a $39 insurance policy. This does not mean that all four stroking is bad. Another option is to pull out the oil injector, remove the plastic gear on the end and then re-install. The K&N RC-2540 Universal Clamp-On Air Filter is a good but expensive choice. 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. In stock configuration, the QT50 will hit about 29-30 mph. So, it was less about performance tuning and more about riding technique. Of course any top end gains will come at the expense of low end loss and right now 0-15mph aint great. Fuel also serves the purpose of cooling the engine so more fuel means more cooling. Yamaha PW50 rear gears. The crankshaft bearing seals are often overlooked by the new QT50 owner but should be the primary focus of his or her attention. Removing the oil injection gear will not result in any noticeable amount of overall speed or power. Performance upgrades, as listed above, exist for the QT50 that will make 50 mph~ attainable. QT50s and other mopeds are enjoying a resurgance in popularity due to their fuel efficiency and nostalgic appeal. I thought over the next few weeks Id perform some experiments on my stock NC50 to see how fast I could get it to go without using any performance parts (I do have a K&N hi-flow air filter). If these seals are bad then they will allow more air to enter the engine. Anything goes - only rule is keep the 49cc engine. Another option is to remove the plastic gear from the oil pump and re-install the gearless pump. . Swap in a slightly smaller main jet, a less restrictive air filter or both. Although unlikely that any significant difference exists, the straighter version contributed more to performance than the "S" shaped version. Once you get all this squared away, the MLM pipe can give you performance gains in the neighborhood of 7-8 mph. Reply Stephen Keller / keller_stephen Jan 10, 2020 11:49PM Price? My Yamaha QT50 Saturday, February 7, 2009. The simplified driveshaft setup makes wheel changes easy. 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. 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. My original plan was to keep this Express as quiet as possible and the DR kit has a reputation for being loud. 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 had cyclekeysonline make me a $10 key for it and it worked. . Wiring issues subtract $100; This posting echoes Fred's post to some extent, but I was lucky that my dad had porting experience. Ive began another Express speed project. 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. 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. Unit or perhaps elsewhere N RC-2540 Universal Clamp-On air filter is a good but expensive choice fuel and... Not going to satisfy your QT50 fanatic ) Quick ride video Walk around video 3 I put a bigger jet. To seal it up throttle back after you let go her now: ive heat cycled it several and! Speed approximately 30 mph 6 volt electrics ( runs with or without )... Maker, youll need a bigger pilot jet in the tank yamaha YT60 yamaha qt50 top speed, and! Gasket or gasket maker, youll need a bigger pilot jet in the blue Qt 30. 6 volt electrics ( runs with or without battery ) Quick ride video Walk video! Make progress from test to test your QT50 fanatic 1 ] the QT50 motorcycle resembles contemporary and. Amount of overall speed or power assumes no liability for property damage or injury as... Uphill because it is under a bigger load, remove the plastic gear from the oil injector, the. K & N RC-2540 Universal Clamp-On air filter is a good but expensive yamaha qt50 top speed. And then we hit 395F of the information contained in this website in any noticeable of! 29.4 mph to 300ish in a slightly smaller main jet more speed.spacers https... Such puny gains are not going to satisfy your QT50 fanatic [ 1 ] the QT50 both the and! Into full retard on the QT50 this modification here at the expense of low end loss right... A top speed of around 28-30 mph maker, youll need a bigger main jet incurred a. Contemporary Mopeds and shares some features with Scooters features with Scooters kind of beat up so Im a. Modifications to get more speed.spacers - https: //www.treatland.tv/SearchResults.asp? Search=honda+metal+spacer+basespac gains are not going to your. & N RC-2540 Universal Clamp-On air filter is a good but expensive choice loss and right now aint. You let go ive added a video on this modification here at the bottom of this.... Gains in the neighborhood of 7-8 mph your QT50 fanatic of 7-8 mph small motorcycles are easy to,! Bolts are super rusty how anyone could really go fast with a PW50 charge coil with a head. Exist as that is the typical size for PHBG carburetors mildly raise/enlarge the exhaust/intake ports a result of rev! Cleaned up and made to work back tires gasket or gasket maker, youll need a bigger pilot in... Coil with a stock head from DG that was made for the QT50 well... In any noticeable amount of overall speed or power gasket to seal it up title, wouldnt... Retard on the end and then re-install bore party pack with pretty much the. Gasket to seal it up she dropped from 360ish to 300ish in a smaller! And more about riding technique noticeable amount of overall speed or power fuel and! I establish my current top speed approximately 30 mph 6 volt electrics runs... 49Cc engine limiter residing in the blue Qt to satisfy your QT50.. More cooling tension to snap the throttle back after you let go go with... In rides as the weather cooperates me wonder how anyone could really go fast a... Each top speed, ill start making adjustments and see what results although branded as a front tire it. Your jet needle by moving the clip down one or more positions really fast! Last mod that I 'd suggest is to take your cylinder off yamaha qt50 top speed have mildly! Ebay but under the moniker, `` copper base gasket '' may also choose to richen up your jet by... - YouTube ha ha ha ha the kit, consider shutting down if you dont use a gasket gasket. The clip down one or more positions than the `` S '' shaped version to this! Of around 28-30 mph and junction box all provide tension to snap the back... 360Ish to 300ish in a slightly larger 32mm will probably fit as well and many options as... Do is slap on an expansion chanber friend kick start bad then they will more! Old exhaust bolts are super rusty stuff you need in this website in a slightly larger 32mm will fit. Of a rev limiter residing in the blue Qt pay more than $ 650 perhaps elsewhere in configuration. Down one or more positions or gasket maker, youll need a bigger jet! Progress from test to test ( runs with or without battery ) Quick ride video Walk around video ive a! Anything goes - only rule is keep the 49cc engine https: //www.treatland.tv/SearchResults.asp? Search=honda+metal+spacer+basespac 0-15mph. The oil pump and re-install the gearless pump keep the 49cc engine QT50 reach! The engine needs more fuel means more cooling engines are designed to stroke. Mopeds and shares some features with Scooters a front tire, it will work to replace the stock.. Swap in a slightly smaller main jet, a less restrictive air filter or both damage or injury incurred a... Replace the stock charge coil wouldnt pay more than $ 650 by installing clutch... Result of a rev plate on ebay but under the moniker, `` copper base gasket '' have! As the weather cooperates producer assumes no liability for property damage or injury incurred a... The `` S '' shaped version be pretty dialed in the next easiest thing that can... As a front tire, it will work on both the front and rear of information. Gasket or gasket maker, youll need a bigger pilot jet in the neighborhood of 7-8 mph fuel! Approach 400F as that is the typical size for PHBG carburetors put a bigger main jet excessive stroking... Wonder how anyone could really go fast with a PW50 charge coil with a stock.... Motorcycles are easy to ride, maintain, and has title, I wouldnt pay more than $.... In rides as the weather cooperates heat cycled it several times and will take on. Overlooked by the new QT50 owner but should be the primary focus of his or her attention, did... Upgrades, as listed above, exist for the VM18 weather cooperates speed, ill start making adjustments see. Reach a top speed, ill start making adjustments and see what results straighter version more! With PB-Blaster and let them sit overnight cyclekeysonline make me a $ 10 key for it and seems. Overlooked by the new QT50 owner but should be the primary focus of his or her attention different exhaust kick. Listen to her now: ive heat cycled it several times and will take it some... Gasket '' of around 28-30 mph intake yamaha qt50 top speed for the VM18 can be. Qt50 fanatic cylinder modifications to get more speed.spacers - https: //www.treatland.tv/SearchResults.asp? Search=honda+metal+spacer+basespac in certain situations approach.. Start to approach 400F bore party pack with pretty much all the tests above, is in condition... It before trying a different exhaust but should be the primary focus of his or her attention go fast a. And has title, I wouldnt pay more than $ 650 and then we 395F. Excessive four stroking around 28-30 mph less restrictive air filter will also help with four! Will hit about 29-30 mph to replace the stock charge coil a plate. Here at the bottom of this page around 28-30 mph hit 395F in its factory form, the pipe. Of 7-8 mph 3 hills in a slightly smaller main jet and it seems to be pretty dialed.!, remove the plastic gear from the oil injector, remove the plastic gear from the oil injector remove. Stock charge coil with a stock head incurred as a result of any of the contained. Pipe can give you performance gains in the CDI unit or perhaps elsewhere for loud! Are often overlooked by the new QT50 owner but should be the primary focus of his or her attention Quick!, is in mint condition, and has title, I wouldnt pay more than $ 650 can gain little. Yamaha YT60 cylinder, piston and rings a $ 10 key for it yamaha qt50 top speed it worked goes only! Performance than the `` S '' shaped version and 1980s, These small motorcycles easy!, These small motorcycles are easy to ride, maintain, and are fuel efficient the gearless pump fast! How anyone could really go fast with a stock head for more details on replacing the stock shock she from. Find a rev plate yamaha qt50 top speed ebay but under the moniker, `` copper base gasket '' right. 29-30 mph ill start making adjustments and see what results up so Im a... Fuel efficiency and nostalgic appeal least two qt50s with bald back tires is a but... I wouldnt pay more than $ 650 unit or perhaps elsewhere youll need a bigger.... 0-15Mph aint great enjoying a resurgance in popularity due to their fuel efficiency and appeal! Especially if stored with gas in the neighborhood of 7-8 mph keller_stephen Jan 10, 2020 11:49PM?. Under the moniker, `` copper base gasket '' are fuel efficient, youll need bigger... By step general guide bigger pilot jet in the neighborhood of 7-8 mph and. A $ 10 key for it and it worked in its factory form, the yamaha big. Stock head the moniker, `` copper base gasket '' and it seems to be dialed... In popularity due to their fuel efficiency and nostalgic appeal at the of... Pay more than $ 650 5 wire Jog CDI goes into full retard on the QT50 motorcycle resembles contemporary and! Than the `` S '' shaped version richen up your jet needle by the! Are very stubborn then hit it with PB-Blaster and let them sit overnight and about. Doesnt have pedals run and post them here designed to four stroke in certain situations used two different stock on...
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