As I'm sure some saw, my dad blew his tranny up in his '00 426 a few weeks ago. It is in the process of a rebuild, and my uncle (who is doing the rebuild), was going to put a 13.5:1 high compression piston in the bike. (Stock 11:1.) ANyone do something like this, and have any benefits or drawbacks? We'd heard something of more torque, but a significant reduction in the bikes ability to rev. True?