I brought a 98 wr400 and the guy said that the 2 intake valves might need a shim!! I took the motor out of the frame and used a gauge. I could fit a .07 on all except 1 intake. My question is if I try to use the kick to start it I could only do one kick and they I have to use the decomp valve to release the pressure and then I could try to kick it again. Would 1 valve make such a difference??? Sorry I'm new to the 4 strokes always had 2 stroke.