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Servicing Your Honda 91
Valve Clearance
7. Lift the rocker arms (12) up and remove the
shims (13).
NOTICE
Be careful not to damage the intake rocker arms.
Do not let the shims fall into the crankcase.
Do not clean the intake rocker arms using a
commercially available compound cleaner.
1. Measure the shim thickness with a micrometer
and record it.
Seventy-three different shims (1) are available
in 0.025 mm thickness intervals, from 1.200
mm (the thinnest) to 3.000 mm (the thickest).
2. 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 3.000
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.
(12) rocker arms
(13) shims
(13) (12)
(12)
(12)
(13)
(13)
Shim Selection
(1) shim
(1)
1.80 mm 1.825 mm 1.85 mm
1.875 mm
31MKE910.book 91 ページ ２０１９年２月１４日 木曜日 午後１時４１分
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