My brother gave me his k&b because he doesn't have a use for it anymore. It is almost brand new but I put anew ring and gaskets in it already. Waiting for some cold and medium cold glow plugs to come in. I ordered them because all I have for fuel is 20/20 and 30% instead of getting a shim I did just a little work to the head and sharpened the radius of the fin on the pistion. Mostly because everyone seems to run no more than 10% in these. I kinda don't know about these engines, the smallest one I've done before this was a weed eater. I'm not planning on doing a plane, Oklahoma might not allow it after too long. So I wanted to do something neat and abnormal with it, maybe strap it to a bike (prop style) for my little brother or street luge(with like a 6inch drive wheel) just to see if it'll do anything. Lol but all else fails, I'll just put it on the shelf for show and move on. Has anyone played around with one of these like this? Also, if I can't pull a kid with it, I'm using the fuel is a steel spud canon. Good idea? Bad idea? Lol I want your thoughts on these