intake and exhaust should be .008 inches, check your cam/timing chain too. Mine was stretched to all hell and it probably is skipping time, if it is stretched the tensioner is on the right side of the cylinder towards the bottom if you are looking at the left side of the quad.
2001 Kawasaki Mojave 250:
-Maier race cut plastics
-ITP holeshot front/rear tires on ITP c-10 rims
-White Bros E. series slip-on
-Jardine nerf-bars
-Alba pro elite bumper
-2" wheel spacers
-Mikuni 36mm carb
-ceet racing seat cover