8. CYLINDER HEAD/VALVE
8-2
Precautions in Operation
General Information
y This chapter is contained maintenance and service for cylinder head, valve, and camshaft as well as
rocker arm.
y Cylinder head service can be carried out when engine is in frame.
Specification
Item Standard Limit
Compression pressure 12+/0.2 kg/cm2 ---
Intake 25.768~25.920 25.37 Camshaft Height of cam lobe
Exhaust 25.755~25.531 25.36
ID of valve rocker arm 10.000~10.015 10.10 Rocker arm
OD of valve rocker arm shaft 9.972~9.987 9.910
Intake 4.970~4.980 4.900 OD of valve stem
Exhaust 4.955~4.970 4.900
Guide seat 5.000~5.012 5.030
Intake 0.010~0.037 0.080 Clearance between
valve stem and guide
Exhaust 0.030~0.062 0.100
Free length of valve spring 35.000 31.500
Valve
Valve seat width 1.000 1.8
Tilt angle of cylinder head --- 0.05
Torque Value
Cylinder head bolt 2.0~2.4kgf-m
Cylinder head Nut 2.0~2.4kgf-m
Sealing bolt of cam chain auto-tensioner 0.8~1.2kgf-m
Bolt of cam chain auto-tensioner 1.2~1.6kgf-m
Cam sprocket cover bolts 0.8~1.2kgf-m
Cam sprocket bolt 0.8~1.2kgf-m
Spark plug 1.0~1.2kgf-m
Tools
Special service tools
Valve reamer: 5.0mm
Valve guide driver: 5.0mm
Valve spring compressor
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