anyone have any great idea's on how i should mount and use a motor on a bike.. the Gf wants to start ridding bike's but i dont see myself peddling the whole way.. so i want to mount a motor.. i have a 6hp briggs but i think thats to big. thinking about putting a weedeater motor.. or chainsaw motor on it.. either way if anyone has done it or has some good input that would help.