Section 04 ENGINE
Subsection 03 (VALVE ADJUSTMENT)
04-03-2 MMR2000_118_04_03A.FM
VALVE ADJUSTMENT
NOTE: Valve clearance inspection and adjustment
must be performed with the engine cold.
Preparation
Remove cylinder head cover bolts no. 1, cylinder
head cover no. 2 and gasket no. 3.
Set the piston at TDC (Top Dead Center) of the
compression stroke, as shown in the following
procedure.
COMPRESSION STROKE TDC POSITIONING
Remove spark plug no. 4.
Turn engine clockwise (PTO side) by hand so that
triangular mark on starter pulley align with the top
hole on the fan cover.
REWIND STARTER HAS BEEN REMOVED
1. Triangular mark aligned with fan cover top hole
2. Rotate clockwise to position engine at TDC of compression
stroke
CAUTION: The triangular mark on the starter
pulley will align with the top hole on the fan
cover when the piston is at top dead center of
the compression or exhaust stroke. Ensure that
piston is at TDC of the compression stroke. At
compression stroke both valves are fully
closed.
Valve Clearance Inspection
Insert a feeler gauge between rocker arm no. 5
and valve no. 6. Refer to the following table for
valve clearance.
NOTE: When inspecting clearance, ensure that
feeler gauge does not compress valve springs
no. 7. Valve springs have low compression rates.
If valve clearance is not according to the above
table, perform valve clearance adjustment as de-
scribed in the following procedure.
Valve Clearance Adjustment
Hold rocker arm pivot no. 8 and loosen rocker arm
pivot lock nut no. 9, as shown in the next photo.
1. Tool retaining rocker arm pivot
2. Tool loosening lock nut of rocker arm pivot
3. Feeler gauge
Turn rocker arm pivot to obtain the specified clear-
ance.
Retighten the rocker arm pivot lock nut while hold-
ing the rocker arm pivot.
Recheck valve clearance after tightening the rock-
er arm pivot lock nut.
Reinstall cylinder head cover with gasket then se-
cure with cylinder head cover bolts tightened in a
crisscross sequence.
1
A31C18A
2
STANDARD VALVE CLEARANCE
Intake valve
0.15 ± 0.02 mm
(0.006 ± 0.001 in)
Exhaust valve
0.20 ± 0.02 mm
(0.008 ± 0.001 in)
A31C19A
3
1
2
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