Ch. 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/cm
2
---
Intake 36.478 36.458
Camshaft Height of cam lobe
Exhaust 36.847 36.832
ID of valve rocker arm 13.000-13.018 13.098
Rocker arm
OD of valve rocker arm shaft 12.991-13.009 11.936
Intake 4.975-4.990 4.900
OD of valve stem
Exhaust 4.955-4.970 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 33.700 30.100 Free length of valve
spring
outer 38.800 35.200
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
Sparkplug1.0-1.2kgf m
Tools
Special service tools
Valve reamer: 5.0mm
Valve guide driver: 5.0mm
Valve spring compressor
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