Are there any differences between the TRX250r bottom ends and the 85-86 ATC bottom ends? Can you use a TRX Bottom end gasket kit to rebuild a ATC bottom end? I always see gasket sets for TRX on ebay but rarely for the ATC's. Also, what is the advantage of using the longer rod off of an 88-89 TRX? Is there alot involved in the switch over? Also, any hop ups or tricks for the top end? ie what year cr250 gaskets. Sorry for all of the questions, but I'm going to do an entire rebuild of the motor top to bottom and I want to do it once and I want to do it right.