hi i wood go with a motor swap you say you have sum motors that will go on but you is not sure if the pulley will fit you don't need to by a new pulley or belt just mod the original pulley IE if the motor shaft on the new motor is to big mack the hole in the pulley to mach and if its the other way round mack a bos hope this helps o and do you remember them c5 bike things made by sicler well ther motors and gubings was made by hoover
krv3000, proud to be a member of MetalworkingFun Forum since Feb 2012.