Honda TRX450R Service Manual page 76

MAINTENANCE
Clean the valve shim contact area in the valve lifter
with compressed air.
Measure the shim thickness and record it.
Seventy-three
different shim sizes
are available from
1.200 mm to 3.000
mm in intervals of
0.025 mm.
Calculate the new shim thickness using the equa-
tion below.
A = (B-C) + D
A: New shim thickness
B: recorded valve clearance
C: Specified valve clearance
D: Old shim thickness
NOTE:
• Make sure of the correct shim thickness by mea-
suring the shim using a micrometer.
• Reface the valve seat if carbon deposits result in
a calculated dimension of over 3.000 mm
Install the shims in Install the newly selected shims on the valve retain-
their original ers.
locations.
| n s t £ | | | t h f i c a m s h a f t h o
|
d e r a s s e m b
|
v
(
p a g e
n.29).
Inspect the decompressor clearance and adjust it if
necessary (page 4-13).
1.80 mm 1.825 mm 1.85 mm 1.875 mm
4-12