Well I have 3grand to spend on something, and I want to put a different motor into my 300ex. I dont want to hear people telling me to just buy a 450, I dont want to spend that kind of money and I think it would be a fun project. I was thinking either a 85 motor or a 125. Would a 85 motor be more powerful then the 300? I know it would hit harder. Also about the motor mounts, thats really the only thing I would have to do, that and the radiator mounting. Also what gearing are people running with an 85 motor or a 125 in a quad. Thanks