I remember reading a while back that someone put a different taper needle in their KX and it smoothed power delivery out (more linear). I've got the stock NAFF needle in my bike now. Clips in the top position and I'm still running a little fat (48 pilot -- stock 52 and dropped one size on the main 160 is stock). The bike chugs great down low (pc pipe and shorty silencer) but when the power comes on, it'll put you in the dirt if you're not ready for it. I'm running it in the deep Florida sand so a little rich is good. Flywheel weight (9 or 10 oz) is probably my next step. Any suggestions?