Hi!!!!!!!!!!!!!!!!

Hey, I'm new to the forum, but not to bikes or engines. I've been riding bikes for about 9 years now, and have yet to fit an engine on one. The only bikes that I own are a 3G Beach Cruiser, and a Mongoose BMX. I've been trying to figure out how to out a little 23cc friction drive engine on my bmx lately, so if you could help me at all, that would be great. Oh, and I'm not just trying to mount it. I'm trying to make and assembly so that i can lift the engine off my tire, which is probably gonna be a lot harder.