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Maintenance
Calculate the new shim [1] thickness using the equation
below.
A: New shim thickness
B: Recorded valve clearance
C: Specified valve clearance
D: Old shim thickness
A = (B – C) + D
• Make sure of the correct shim thickness by measuring
the shim using a micrometer.
• Seventy-three different thickness shims are available
from 1.200 mm to 3.000 mm in increments of 0.025
mm.
• Inspect the valve and valve seat if carbon deposits
result in a calculated dimension of over 3.000 mm.
Refer to an official Honda Service Manual or see your
dealer to inspect the valve and valve seat.
[1]
1.80 mm
1.825 mm
Install the newly selected shims [1] on the valve spring
retainers.
Lower the rocker arms [2] down.
• Be careful not to damage the intake rocker arms.
[2]
[2]
2-30
1.85 mm
1.875 mm
[1]
[1]
Turn the crankshaft clockwise to align the "T" mark [1] on
the primary drive gear with the index mark [2] on the right
crankcase cover.
[1]
Apply molybdenum oil solution to the camshaft cam
lobes.
Install the camshaft [1] while installing the cam chain [2]
onto the cam sprocket.
• Install the camshaft with the intake cam lobes facing
up.
Slide the bearing [3] until it is fully seated to the camshaft
rib [4].
Check the decompressor weight [5] is in position as
shown.
[3]
[2]
[4]
[2]
[1]
[5]
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