Hey beachcruiser -- scratching my head here ?? Doesn't seem like it would matter where the engine is located as far as top speed. OK - I am just getting back into Mbs myself -- is this a chain, belt or friction drive ? With a friction drive - I don't see where location could make a difference in either contact to tire or top speed.. With a chain or belt drive - location of engine - could make a slight difference. Happy Riding from - Mountainman