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Precautions in Operation:
This chapter contains 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.
Standard Limit
12 ± 2 kg/cm2 /
Intake 33.442 33.392
Exhaust 33.327 33.277
Rocker Arm 12 - 12.018 12.080
Valve 11.966 - 11.984 11.936
Intake 4.975-4.990 4.900
Exhaust 4.950-4.975 4.900
5.000-5.012 5.030
Intake 0.010-0.037 0.080
Exhaust 0.025-0.062 0.100
Free length of valve spring Inner 36 32.500
Outer 39.5 36.000
1.600 /
Intake 0.1± 0.02mm /
Exhaust 0.15± 0.02mm /
Clearance between valve stem & guide
Torque Value Ft/Lbs
Cylinder head cover bolt 7-10 ft/lbs
Exhaust pipe stud bolt 17-21 ft/lbs
Cylinder head bolt 7-10 ft/lbs
Cylinder head Nut 14-16 ft/lbs
Sealing bolt of cam chain auto-tensioner 6-8 ft/lbs
Bolt of cam chain auto-tensioner 8-12 ft/lbs
Cylinder side cover bolt 7-10 ft/lbs
Cam sprocket bolt 7-10 ft/lbs
Tappet adjustment screw nut 5-7 ft/lbs
Spark plug 7-10 ft/lbs
Tools: Special service tools
• Valve reamer: 5.0mm
• Valve guide driver: 5.0mm
• Valve spring compressor
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