Got my hands on a small engine... really small.
 

So, courtesy of a neighbor, I got my hands on a broken weed eater with a small 25cc, I think, engine. The engine itself is in useable condition, I think. I'll have to test that out tomorrow, but the idea I have for it is to, maybe, but on a bike. I've seen where people have put a roller on the back wheel, but I want it to go through the gears on my bike, or an old mountain bike, so I have the option to change the gears. Am I in way over my head, or does anyone think this might be possible?

I think a weed whacker engine would be too small on a bicycle. Maybe on a scooter though.

"This," is a small engine....homemeade, solid brass...

http://i30.photobucket.com/albums/c3...fsbuggy/e1.jpg

http://i30.photobucket.com/albums/c3...fsbuggy/e2.jpg