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2-8 PERIODIC MAINTENANCE
VALVE CLEARANCE
1. Remove following parts:
• Motor cover
• Side covers
• Recoil starter
• Spark plugs
2. Disconnect the fuel hose
1
from fuel pump
2
.
3. Remove the six bolts and cylinder head cover
3
.
4. Rotate the flywheel clockwise to bring each piston to Top
Dead Center (TDC) on compression stroke. Align each
PUNCH mark on cam pulley with INDEX mark on cylinder
head block.
NOTE:
• The piston must be at its TDC position on a compression
stroke to check or adjust valve clearance.
• The valve clearance specification is for COLD engine condi-
tion.
5. Insert the thickness gauge between valve stem end and
valve adjusting screw on rocker arm.
09900-20803: Thickness gauge
Valve clearance (cold engine condition):
IN. 0.18 – 0.22 mm (0.007 – 0.009 in)
EX. 0.18 – 0.22 mm (0.007 – 0.009 in)
If measurement is out of specification, adjust valve clearance.
Inspect initially after 20 hours (1 month) and every
200 hours (12 months).
PUNCH mark
TDC cylinder number
1
No. 1 cylinder
2
No. 2 cylinder
Rotate the crankshaft in the normal running direction
only (clockwise) to prevent water pump impeller dam-
age.
2
º
1
º
INDEX mark
Punch mark