Cylinder Head/Valves - KYMCO SUPER8 50 Service Manual

7. CYLINDER HEAD/VALVES

SERVICE INFORMATION...................... 7-1
TROUBLESHOOTING ............................ 7-2
CAMSHAFT REMOVAL......................... 7-3
CYLINDER HEAD REMOVAL .............. 7-5
SERVICE INFORMATION
GENERAL INSTRUCTIONS
• The cylinder head can be serviced with the engine installed in the frame.
• When assembling, apply molybdenum disulfide grease or engine oil to the valve guide movable
parts, valve arm and camshaft sliding surfaces for initial lubrication.
• The camshaft is lubricated by engine oil through the cylinder head engine oil passages. Clean and
unclog the oil passages before assembling the cylinder head.
• After disassembly, clean the removed parts and dry them with compressed air before inspection.
• After removal, mark and arrange the removed parts in order. When assembling, install them in
the reverse order of removal.
SPECIFICATIONS
Item
Valve clearance (cold)
Cylinder head compression
Cylinder head warpage
Camshaft cam height
Valve rocker arm I.D.
Valve rocker arm shaft
O.D.
Valve seat width
Valve stem O.D.
Valve guide I.D.
Valve stem-to-guide
clearance
Valve spring free
l h
7-1
CYLINDER HEAD DISASSEMBLY.......7-7
CYLINDER HEAD ASSEMBLY .............7-8
CYLINDER HEAD INSTALLATION .....7-8
CAMSHAFT INSTALLATION................7-9
Standard (mm)
IN 0.04
EX 0.04
14kg/cm
⎯
IN 26.438
EX 25.807
IN 10.000-10.015
EX 10.000-10.015
IN 9.972-9.987
EX 9.972-9.987
IN 1.0
EX 1.0
IN 4.975-4.990
EX 4.955-4.970
IN 5.000-5.012
EX 5.000-5.012
IN 0.010-0.037
EX 0.030-0.057
Inner 31.1
Outer 34.35
Service Limit (mm)
2
SUPER8 50
⎯
⎯
⎯
0.05
26.038
25.407
10.10
10.10
9.91
9.91
1.8
1.8
4.9
4.9
5.03
5.03
0.08
0.1
30.1
33.3