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CYLINDER HEAD / VALVES
SERVICE INFORMATION CYLINDER HEAD REMOVAL
TROUBLESHOOTING CYLINDER HEAD INSTALLATION
CAMSHAFT COMPOSITION REMOVAL
SERVICE INFORMATION
GENERAL
This section describes cylinder head, valves, camshaft and the other parts maintenance. The engine must be
removed from the frame to service cylinder head. Camshaft lubrication oil is fed to the cylinder head through
an oil orifice in the engine case. Before installing the cylinder head be sure the orifice is not clogged and the
gasket, O-ring and dowel pins are in place.
SPECIFICATIONS
ITEM STANDARD SERVICE LIMIT
CYLINDER COMPRESSION
12±0.5 kg/cm
2
--------
IN 29.795 29.395
CAM LOBE HEIGHT
EX 29.560 29.160
ROCKER ARM I.D. 10.000-10.018 10.10
ROCKER ARM SHAFT O.D. 9.972-9.987 9.91
CYLINDER HEAD WARPAGE -------- 0.05
IN 32.3 31.2
VALVE SPRING FREE LENGTH
OUT 35.0 34.1
IN 4.975-4.990 4.90
VALVE STEM O.D.
EX 4.955-4.970 4.90
VALVE GUIDE I.D. IN/EX 5.000-5.012 5.30
IN 0.010-0.037 0.08
STEM-TO-GUIDE CLEARANCE
EX 0.030-0.057 0.10
IN 1.0 1.8
VALVE SEAT WIDTH
EX 1.0 1.8
TORQUE VALUES
Cylinder head bolts 8 ~ 12 n-m (0.8 ~ 1.2 kg-m)
Camshaft holder flange nuts 20 ~ 24 n-m (2.0 ~ 2.4 kg-m)
Tappet adjusting nut 9 ~ 12 n-m (0.9 ~ 1.2 kg-m)
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