CRF Valve Shim Calculator
to shim your Honda CRF450R/CRF450X valves to their correct
tolerances? Use this valve shim calculator to make
the job easy. It's set up with shim specs for the
CRF450 but you can change those and use this calculator
for the Honda CRF250R and CRF250X as well. At the bottom it has the Honda part numbers for all the available shims as well a link to the Hot Cams Shim Kit.
CRF450R - CRF450X Valve Shim Calculator
Inches to Millimeter Conversion:
Make sure of the correct shim thickness by measuring
the shim by micrometer.
the valve seat if carbon deposit result in a calculated
dimension of over 3.000 mm.
different thickness shims are available from the
thinnest 1.200 mm thickness shim to the thickness
3.000 mm thickness shim in intervals of 0.025mm.
NEED SHIMS? Below are the Honda part number for shims. You could also purchase the Hot Cams Shim kit listed in our catalog or just click here. You can also purchase individual shims from our OEM parts website at www.yeltrik.com.
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