For those new to the hobby i have been browsing the net in a insomniac trance and came upon the following site.
Wizard Chopper Bike, Motorized Bicycle, Gas Powered Chopper Bicycle, Schwinn
If you scroll to the bottom there is a frame with drop in mounts for the China Motors from 49cc to 80cc it also has a front disk break and a pre bolted on rear sprocket. at $399 for that type of setup if you have the cash and want that chopper feeling this is really a neat possibility
Any input is welcomed .