Can anyone tell me the difference between a Yamaha 15hp and 20hp. I feel the need for a little more speed without purchasing a new motor. I own a 15hp, but is it possible to put the carby jets from a 20hp into the 15hp? or do you need a new carby from a 20hp or am I on the wrong track. Everything about the 15 and the 20 read the same, bore, stroke, displacement etc.
