Re: Friction mounts
I made a friction drive 25cc weedeater once. Not the most thrilling ride, but enough for a few kicks. I forget how it mounted, but i made a sort of scissor pivot for the motor. There was a lever on the side, like a suicide clutch for engaging/disengaging the drive roller from the wheel. The roller was just a plain 7/8" socket attached to the flywheel.
It didn't last long. The amount of pressure required to keep the socket from free spinning was a lot, which fatigued the crankshaft and eventually broke it. It was awesome. Parts went everywhere. The flywheel came off and whizzed down the street in front of me.