9-1
9. CYLINDER HEAD / VALVES
SERVICE INFORMATION
GENERAL SAFETY
● The rocker arm and the camshaft can be serviced without removing the engine. However, the engine must be removed
from the frame to maintain the cylinder head.
● The oil of camshaft is supplied through the cylinder head oil hole. Clean the oil hole prior to assembling the cylinder
head.
SPECIFICATIONS
9
SERVICE INFORMATION
····
9-1
TROUBLESHOOTING
········
9-2
CAMSHAFT
················
9-3
CYLINDER HEAD
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9-5
VALVE SPRINGS
············
9-6
VALVES
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9-7
VALVE GUIDES
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9-7
VALVE SEATS
············
9-8
CYLINDER HEAD ASSEMBLY
··
9-11
CAMSHAFT ASSEMBLY
······
9-13
TORQUE VALUES
CAM CHAIN TENSIONER PIVOT BOLT 1.0 kgf·m (10N·m)
SPARK PLUG 1.1 kgf·m (11N·m)
CAMSHAFT HOLDER 8mm NUT 2.0 kgf·m (20N·m)
CAM CHAIN TENSIONER MOUNTING BOLT 1.2 kgf·m (12N·m)
CAM CHAIN TENSIONER SEALING SCREW 0.4 kgf·m ( 4N·m)
CYLINDER HEAD COVER BOLT 1.0 kgf·m (10N·m)
CRANK SHAFT HOLE CAP 0.8 kgf·m ( 8N·m)
A.C.GENERATOR CAP 0.6 kgf·m ( 6N·m)
ITEM STANDARD VALUE SERVICE LIMIT
Unit : mm
ROCKER ARM
CAM HEIGHT
CAMSHAFT
VALVE,
VALVE GUIDE
ROCKER ARM INNER DIAMETER 12.016~12.034 12.060
ROCKER ARM SHAFT OUTER DIAMETER 11.982~12.000 11.950
IN 37.330~37.490 37.110
EX 37.089~37.249 36.870
VALVE SPRING FREE LENGTH IN,EX 41.65 40.00
IN 4.975~4.990 4.925
EX 4.995~4.970 4.905
VALVE GUIDE INNER DIAMETER IN,EX 5.000~5.012 5.030
CLEARANCE BETWEEN IN 0.010~0.037 0.080
STEM AND GUIDE EX 0.030~0.057 0.100
VALVE SEAT WIDTH 0.7~0.9 1.3
VALVE STEM OUTER DIAMETER
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