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5. CYLINDER HEAD / VALVES
5.1 SERVICE INFORMATION
5.2 TROUBLESHOOTING
5.3 CAMSHAFT ASS’Y REMOVAL
5.4 CYLINDER HEAD REMOVAL
5.5 CYLINDER HEAD INSTALLATION
5.1 SERVICE INFORMATION
GENERAL
This section describes the maintenance of cylinder head, valves, camshaft and the other 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 is sure the orifice is not clogged and the gasket, O-ring and
dowel pins are in place.
SPECIFICATIONS
ITEM
STANDARD
SERVICE
LIMIT
Cylinder compression
160-190 PSI
---------
Cam lobe height
IN
EX
29.795
29.56
29.40
29.16
Rocker arm I.D.
10.000-10.018
10.10
Rocker arm shaft O.D.
9.972-9.987
9.91
Valve spring free length
IN
EX
32.3
35.0
31.2
34.1
Valve stem O.D.
IN
EX
4.975-4.980
4.955-4.970
4.90
4.90
Valve guide I.D.
IN/EX
5.000-5.012
5.03
Stem-to-guide clearance
IN
EX
0.010-0.037
0.030-0.057
0. 08
0.10
Valve seat width
IN
EX
1. 0
1.0
1.6
1.6
TORQUE VALUES
Cylinder head bolts 8~12 n-m (0.8~12 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)
Summary of Contents for Cobra 220
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