I just rebuilt using a tdr hi-po crank, and vito's power piston's. Shee's run great all day every day, except for "seizing" that one time and a buddy was riding her when it happened. He helped rebuild her, otherwise no one rides the shee! I have '97 fmf signature series pipes, toomey 2:1 intake and rad valves. Dead center on the needle clip, 27.5 pilots, and 300 mains. My air screw is all the way in I am at 720 ft, temp 40-60f, and running amsoil premix at 50:1 with 93 octane. Everything seems ok, the guy who bored my jugs did do them really tight, so I am wondering if i should invest in a new head gasket and check things out? thanks...