6. Cylinder Head / Valve
6-2
Precautions in Operation
General Information
This chapter is contained maintenance and service for cylinder head, valve, and camshaft as well as
rocker arm.
Cylinder head service can be carried out when engine is in frame.
Specification
Item Standard Limit
Compression pressure 12‚2 kg/cm2 ---
Intake 34.880 34.860
Camshaft Height of cam lobe
Exhaust 34.740 34.725
ID of valve rocker arm 11.982~12.000 12.080
Rocker arm
OD of valve rocker arm shaft 11.966~11.984 11.936
Intake 4.975~4.990 4.900
OD of valve stem
Exhaust
4.950~4.975
4.900
ID of valve guide 5.000~5.012 5.030
Intake 0.010~0.037
0.080
Clearance between
valve stem and guide
Exhaust 0.025~0.062
0.100
Inner 38.700 35.200
Free length of valve
spring
outer 40.400 36.900
Valve seat width 1.600 ---
Intake 0.10‚0.02mm ---
Valve
Valve clearance
Exhaust 0.15‚0.02mm ---
Tilt angle of cylinder head --- 0.050
Torque Value
Cylinder head cover bolt 1.0~1.4kgf-m
Exhaust pipe stud bolt 2.4~3.0kgf-m
Cylinder head bolt 1.0~1.4kgf-m
Cylinder head Nut 3.6~4.0kgf-m
Sealing bolt of cam chain auto-tensioner 0.8~1.2kgf-m
Bolt of cam chain auto-tensioner 1.2~1.6kgf-m
Cylinder side cover bolt 1.0~1.4kgf-m
Cam sprocket bolt 1.0~1.4kgf-m
Tappet adjustment screw nut 0.7~1.1kgf-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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