was wondering how it ran with the motor at that angle, I had a mongoose mountain bike with that kind of frame but decided to go with the beach cruiser because I didn't see any place to mount the motor .
dude, just aft of the seat post was a swivel mount, so the engine traveled with the suspension... It ran great! The problem was it was mounted to the seat post! Girls would love it, if you know what I mean... It worked, but yea, the vibes were nuts!