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72 Servicing Your Honda
Valve Clearance
1. Clean the valve shim contact area in the valve
lifter (1) with compressed air.
2. Measure the shim thickness with a micrometer
and record it.
Sixty-nine different shims (2) are available in
0.025 mm thickness intervals, from 1.200 mm
(the thinnest) to 2.900 mm (the thickest).
3. Calculate the new shim thickness using the
equation below.
A = (B – C) + D
A: New shim thickness
B: Recorded valve clearance
C: Specified valve clearance
D: Old shim thickness
• Make sure of the correct shim thickness by
measuring the shim with a micrometer.
• Reface the exhaust valve seat if carbon deposits
result in a calculated dimension of over 2.900
mm.
NOTICE
Do not lap the intake and exhaust valves. They are
titanium and have a thin oxide coating. Lapping
will damage this coating.
If required shim size is outside the available range,
have your motorcycle inspected by your dealer.
Shim Selection
(1) valve lifter
(1)
(2) shim
(2)
1.80 mm 1.825 mm 1.85 mm
1.875 mm
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