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 oil is supplied through the cylinder head oil hole. Clean the oil hole prior to assembling the cylinder
head.
SPECIFICATIONS
9
SERVICE INFORMATION
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9-1
TROUBLESHOOTING
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9-2
CAMSHAFT
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9-3
CYLINDER HEAD
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9-5
VALVE SPRINGS
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9-6
VALVES
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9-6
VALVE GUIDES
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9-7
VALVE SEATS
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9-8
CYLINDER HEAD ASSEMBLY
··
9-11
CAMSHAFT ASSEMBLY
······
9-13
TORQUE VALUES
CAM CHAIN TENSIONER PIVOT BOLT 1.0 kgf·m
SPARK PLUG 1.2 kgf·m
CAMSHAFT HOLDER 8mm NUT 2.0 kgf·m
CAM CHAIN TENSIONER MOUNTING BOLT 1.2 kgf·m
CAM CHAIN TENSIONER SEALING SCREW 0.4 kgf·m
CYLINDER HEAD COVER BOLT 0.9 kgf·m
CYLINDER HEAD BOLT 1.1 kgf·m
TAPPET ADJUST NUT 0.8 kgf·m
ITEM STANDARD VALUE SERVICE LIMIT
Unit : mm
ROCKER ARM
CAM HEIGHT
VALVE STEM OUTER DIAMETER
CLEARANCE BETWEEN
STEM AND GUIDE
CAMSHAFT
VALVE
VALVE GUIDE
ROCKER ARM INNER DIAMETER 12.016 - 12.034 39.05
ROCKER ARM SHAFT OUTER DIAMETER 11.982 - 12.000 11.950
IN 33.835 - 33.995 33.625
EX 33.984 - 34.144 33.765
CAMSHAFT OUTER DIAMETER 15.005 - 15.018 15.040
VALVE SPRING FREE LENGTH IN,EX 37.21 36.90
IN 4.972 - 4.984 4.920
EX 4.952 - 4.964 4.900
VALVE GUIDE INNER DIAMETER IN,EX 5.000 - 5.012 5.030
IN 0.016 - 0.040 0.090
EX 0.036 - 0.060 0.120
VALVE SEAT WIDTH 0.8 - 1.0 1.4
CYLINDER HEAD WARPAGE - -
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