Maintenance and Tune-Up: 0B-9
Adjustment
Tappet clearances are adjusted by replacing tappet
shim.
1) With cam nose vertical to valve, turn tappet cut-away
towards center of cylinder head as shown in figure.
2) Rotate crankshaft to open (lift up) valve and then
remove camshaft housing bolts where shim is to be
replaced.
3) Install special tool with camshaft housing bolts as
shown in figure.
Special tool
(A): 09916–68710 (Tappet holder)
4) Rotate top of cam 90 degree counterclockwise and
remove shim from cut- away at tappet.
(Two tappets can be adjusted at the same time)
CAUTION
• Do not put your finger between camshaft
and tappet while the tappet is being held
with the tappet holder.
• Use a magnet to remove and install shim.
• When installing shim, identification mark
on the shim should face down (towards
tappet).
5) After removing shim, measure thickness of original
shim and determine correct thickness of shim for
proper tappet clearance as calculated by following
formula.
Special tool
(B): 09900–20205 (Micrometer (0 – 25 mm))
Tappet clearance specifications
IN. side: A = B + (C – 0.25 mm)
EX. side: A = B + (C – 0.32 mm)
A: Correct thickness of shim for proper tappet
clearance (mm)
B: Thickness of original shim (mm)
C: Original tappet clearance (mm)
1. Shim
“A”: Cut section of the tappet
“B”: Spark plug hole
2. Camshaft housing bolt
“B”: Spark plug hole
“A”
“B”
1
I9J011020009-01
(A)
2
“B”
I9J011020010-01
1. Shim
3. Magnet
1
3
I9J011020011-01
(B)
I9J011020012-01
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