Re: QT50 gearing/upgrades
i don't use that email anymore I use this one now since I changed my handle.
Pw's drive shaft and drive shaft housing is shorter.
Pw's have a taller final drive because they use a smaller rear tire, this means that with a pw rear gear swap you'll pull more mph while at the same rpm. It roughly comes out to a 10% increase in mph at the same rpm.
I did a complete tooth count of a towny engine and qt engine and they are almost the same. The qt's gear is the same as the towny's second gear. The towny has a short first that can be rapped the fuck out if you lighten the first gear's clutch.
I'll say this one final time. THERE IS NO REV LIMITER!!! The stock oil injector pumps toooooo much oil and makes the bike four stroke. This is because the pump not only pumps more oil with more throttle input(ala the split cable that goes to the pump) but also pumps more oil in the higher the rpm gets. That is what gets mistaken as the rev limiter. What the previous poster mentioned about the "start" switch limiting revs is true but it limits them soooo low you couldn't do but 5mph. In fact the "start" mode bypasses the normal cdi and engages a second limited cdi that has the limiter but also a wayyyy higher voltage spark. But again you wouldn't do more than 5mph with it selected to "start" so adjust your pump.
To adjust your pump you need to take off the plastic cover and loosen the pumps jam nut and then turn the adjuster nut and then re-tighten the jam nut. Which way you turn the adjuster nut i forget but even the pw50 manual goes into great detail about how to take a dial indicator to fine tune it.
To use a pw50 rear end you either need to press out the axle shaft from the ring gear and press on the pw's ring gear onto the old qt's axle shaft so the axle shaft is the same length or just use washers to take up the slack. Using washers allows you to later run a right side swing arm if you go with a towny engine like I did or fab up your own right side swing arm like I did before getting a towny engine.
If you want a pw50 rear gear and housing email me, I got two extras. I'll trade you for the stock qt rear gear and housing as I want to start to hit the track soon and I think I'll need to tune my bike for acceleration more than top speed as it's a go kart track.
If you got anymore questions just ask.
this is my qt
|Moto Photog||02/11/11 02:06PM|
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|Hoosier Dude (Moving Targets)||02/13/11 09:35AM|
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