OK, my shee pops at wot. I dont know what it is. I think it might be jetting or reeds. Its sounds like braaaaa, instead of braaaaap. It sounds like it needs to gain just a few more rpms to hit that note. My compression is around 135 with the head mod. ( yes i know i need a new top end) my jetting is a little off too and im working on that. my plugs are still pretty lean at wot. im running pro circuit pipes, silencers. proflow plate with k&n with outwear sock. pro flow water pump, and .030 milled head. Im running 27.5 pilots, with 230 mains, and im about 800ft in elevation. I think jetting needs to come up aways to make the plugs brown. Unless i have an air leak which i have looked for with no results. Would the lack of fuel make the motor pop and sound like S***? Also would that keep me from achieving those last few rpm's? Thanks.