Originally Posted by mammonista
What about one of the small, diesel, air-cooled, 2.5 hp Chinese motors available on the internet about $200 (maybe less) mounted on a mid-90s Huffy tandem bike? Using some kind of friction drive above the rear wheel it might work.
Do you have a link to a $200 diesel, air-cooled, 2.5 hp Chinese motor?
Friction drive is not a great idea for most areas.