4. CYLINDER HEAD AND VALVES
4.1 SERVICE INFORMATION
GENERAL
This section describes maintenance for the cylinder head, valves, camshaft, and related parts. 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
CAM LOBE HEIGHT
IN 29.795
29.395
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
VALVE SPRING FREE LENGTH
IN 32.3 31.2
OUT 35.0
34.1
VALVE STEM O.D.
IN 4.975-4.990 4.90
EX 4.955-4.970
4.90
VALVE GUIDE I.D.
IN/EX
5.000-5.012
5.30
STEM-TO-GUIDE CLEARANCE
IN 0.010-0.037 0.08
EX 0.030-0.057
0.10
VALVE SEAT WIDTH
IN 1.0
1.8
EX 1.0
1.8
TORQUE VALUES
Cylinder head bolts
10-14
N-m
Camshaft holder nuts
19-22
N-m
Tappet adjusting nut
7-11
N-m
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