ANSWERS : Workshop

I'm converting an old mountain bike into a motorized dirt bike kind of thing using a small lawnmower engine. I want to know how to make a clutch that is simple and efficient.  Also I'm curious as to what kind of throttle will work on a lawn mower engine?

Comments

[the mechanical engineer]

centrifigul clutch would be the best option, assuming you know what your doing and are not just trying to "redneck" something to ride around. However, if a centrifigul clutch is too expensive, try a a v-belt, and use a jackshaft to convert it to chain drive for your rear wheel. allow the v-belt to slip, and then use a tensioner pulley to tighten the belt when you want to put it in gear.

[zilcho]

I found some replacement clutch pads on ebay that worked on the lawnmower engine's centrifugal clutch. Also bought a dirt bike handle bar throttle but havent gotten a chance to see if it works yet.

[2hot2hack]

just as he said

[caarntedd]

Centrifugal clutch. Twist throttle control, just like a motorcycle.