Hi guys, I want to put an engine on my bike and I need some people to walk me through it because I can't buy any of those fancy kits they're a little too expensive since I'm only 14 years old. I need your guys help the choose the right engine. Getting an engine won't be a problem because I can go to the flea market and get one. I have 2 bikes I can do this on, a 24" Mountain Bike or a Single Speed 20" bike. Which one is better to use? Ill post some pictures tomorrow in the morning.