Are there any BMX type motorized bicycles that have been built if so which ones and do you have pics? I wanna build one for my son. I have a 34cc Craftsman chainsaw I can sabotage to create a killer Bike and it would be interesting to build. I have seen the friction drives but I wanna make it like mine but smaller for him. He keeps saying "Daddy I want to ride"!!! He's just too small to ride mine. I love this site and appreciate all opinions and all input. Thanks for all the help.