Hey guys, I just bought a Jet 66/80cc engine kit from gasbike.net. I'm trying to figure out which one of my bikes I should put it on... I have two bikes that have the right frame (diamond) and top crossbar is horizontal so lots of room for an engine. My question has to do with the size of the bike, does it really matter? because I want to put it on my 20" bike, is that too small? Please help! Thank you.