Honda CBR650F Service Manual page 75

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MAINTENANCE
ADJUSTMENT
Remove the camshafts (page 10-5).
It is not necessary
to remove the cam
Remove the valve lifters [1] and shims [2].
sprocket from the
• Shim may stick to the inside of the valve lifter. Do
camshaft except
not allow the shims to fall into the crankcase.
when replacing the
• Mark all valve lifters and shims to ensure correct
camshaft and/or
reassembly in their original locations.
cam sprocket.
• The valve lifter can be easily removed with a valve
lapping tool or magnet.
• The shims can be easily removed with a tweezers or
magnet.
Clean the valve shim contact area in the valve lifter [1]
with compressed air.
Measure the shim [1] thickness and record it.
Sixty-nine different
thickness shims are
available from the
thinnest 1.200 mm
thickness shim to
the thickest 2.900
mm thickness shim
in intervals of 0.025
mm.
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 by micrometer.
• Reface the valve seat if carbon deposit result in a
calculated dimension of over 2.900 mm.
3-8
[1]
[2]
[1]
[1]
1.80 mm 1.825 mm 1.85 mm 1.875 mm