What is the main difference in power in these motor. Doest the TRX motor have any more horsepower? Are they interchangeble. I have been getting the drift that the TRX motor kind of evolved for the old atc70, since it is 86cc instead of the atc90's 89cc. anyways if anyone knows much about them, I would love you hear what you say, also will 125m wiring work with atc90engine?