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70 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 thickness shims (2) are
available from the thinnest (1.200 mm
thickness) shim to the thickest (2.900 mm
thickness) in intervals of 0.025 mm.
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 valves. They are titanium and
have a thin oxide coating. Lapping will damage
this coating.
If a calculated dimension is out of specifications,
have your motorcycle inspected by your dealer.
Shim Selection
(1) valve lifter
(1)
(2) shim
(2)
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