Thanks guys. I've really got my work cut out for me with this one.
After long deliberation (bout a minute) I decided to go with the piranha 140cc. The piranha150cc would be nice but it doesn't appear to come with the wiring harness the 140 does. But that's to come once the TRX frame is done. May sell the motor unless I can convert the transmission to use in the ATC motor, TRX tranny is 3 up, ATC is 3 down. So if anyone know about that let me know.
More updates to come