im need replace my bearings in my motor. so i figured why not throw some type r pistons in there for some more compression. first question is, will they fit with having to do any modifications? next is i think my crank has gone to shit. so i was offered a really good deal on a b20 crank. will that fit and work with my set up? will it make a difference in power? am i better off shaving my crank down? please respond ...........thanks