I'm new here and have become very interested in building and/or customizing motorized bikes. I collect all original vintage middle weights and currently have seven including a 1930s tricycle, 1958 AMF Firestone 500 II in mint condition, 1950s Shelby Airflow, 1962/63 J.C. Higgins Flightliner, 1953 AMF Satellite, 1960s Schwinn Hollywood, and 1960s Schwinn America. I'm considering the flightliner for the motor. I know so little about motors that I decided the best place to learn would be from a motor bicycle forum; so here I am. I would appreciate advise on best motors in the $200 range, best frames to mount them on, etc. I live near a thrift store that has a slew of mountain bikes that are never priced over $20 and are in generally good shape - flat tires and a good tune up would fix them up easily. I'm considering buying several rat them out, add a motor, and sell them. Advise is helpful here too. Thanks for your help in advance. I'll be posting pics soon.