1999 YZ400F I checked the valve clearance and they were all tight, one of them extremely tight (I just bought this bike so don't flame me). After carefully measuring the existing clearance, doing the calculation between the existing shims and the clearance specs, I ordered new shims and installed them, torquing the cam caps carefully. The new clearances are not what I expected with the difference between the old shims and the new shims. For example, the left intake was at 0.10mm, so I changed the shim from 175 to 165 and the new clearance should be 0.20mm, right? I measured the new clearance at 0.13mm. Even worse, the center intake valve clearance did not change at all even after changing the shim from 166 to 160. What gives?