I guess one has to be different, but I don't see any advantage, I put a .6hp 4 cycle gas engine, planetary gear to jack shaft, tadpole trike (mad max) lowest gear = 7~mph @7k rpm for hills, in highest gear 35mph+ on a slight downward slope. It is easy to fill, and service, bolt on a new engine a snap, it is low behind the seat, on my right hand side, the bigest problem is the noise, so most of the time I use a 1.99hp (e-go) 24volt electric pusher.