need some help. i have an '02 xr650r transplanted into a tz250 road racing frame. had it on the dyno today with disappointing results. current engine mods: hot cams stage 2 cam wiseco 12.5 / 1 piston head work with extremely large valves mikuni hsr 45 mm carb straightened intake manifold custom one off pipe power mist to-137 fuel (5% oxygen) we also had some trouble with the main jet.(btw i am using an open carb, no air box). the dyno graph is in mph so it is hard to know the precise rpm but if you look around 85 mph (prob. 5000 rpm) the mixture is very rich, then as the rpm's peak it goes a little lean. this is happening with the throttle wide open from 5k to 8k on the main jet. what could be doing this? carb too big? carb too small? do i need a velocity stack? needle and seat too small? as i said in the title, i need to get up to around 65 hp to be competitive. and i think that with my current set up i should be more like 55-58 hp. any advice?