I want to put a motor on a mountain bike, I need some transportation. But I don't know which is best, Im leaning towards a chainsaw motor because it has more horsepower. Oh you, also if its possible Id like to hook up a Lever, that disengages the pedals/chainsaw motor, so that the pedals aren't hittng me when I'm ridin it. Plus id like to put a twist thing like the motor cycle have for the gas, instead of a break pedal. Please help!

Reminds me of a story my dad told about doing this... he was young, and forgot about how he would stop it once he got it going... so he went for quite a ride from the way he tells it!

One thought is that it might be cheaper for you to find a moped?

Wee, that's sounds like fun, but one I live in the mountains where there sand, dirt mud, or a combo platter. Also I like working with my hands, and am on a tight buget. But thanks for the idea.

Well, try going on line for plans to build such a thing. There are plans for building mini bikes, go carts, etc. So there may be something for the conversion of a mountain bike into a gas powered mountain bike.

I would think a little enduro would work great for you. Like a late 1980's kawasaki 80. Around here you can buy them for 250-300 dollars. I would think you will have more than that into your mountain bike before you are finished.
Mike

Use Mike's suggestion, I too think you would come out cheaper.

I would recommend a mini bike for your needs because you can find them almost anywhere. Check gragesales, eBay, craigslist, or build your own. There is also a few places that sell kits to put a engine on your bike.

mrfreyguy54321

Use the Chain saw, it already has an auto clutch so you can let of throttle and it will disengage, mount it above rear wheel on one of those racks, use bigger chain without cutting heads (duh), mount another sprocket on side of wheel and you won't have to worry about pedals because of one way bering, make sure sprockets from chainsaw and wheel are lined up or else chain may come loose and cause MAJOR pain, Make sure chain is tight for same reason,
Mess with gear sizes for speed vs. acceleration.
The bigger the gear on the wheel, the faster, but if it gets to big the engine won't have enough power to keep going without help and may stall

Quick correction, the smaller the sprocket on the wheel the faster it will go, oh, and the larger the gear the more torque (thats the turning power, if you don't know) so if you are in hilly country, you may want to put a fairly large gear on the wheel, add some washers too, gives the gear more space so it doesn't tear up the bikes frame