KYMCO 125 MOVIE S INJECTION, Manual

Page: 75 / 213

7. CYLINDER HEAD/VALVES
7-1
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 Standard (mm) Service Limit (mm)
IN 0.12
æ
EX 0.12
æ
Cylinder head compression pressure 12.8kg/cm
≤ñ
570rpm
Cylinder head warpage
æ
IN 25.965 25.57
EX 25.810 25.41
IN 10.000
_
10.015 10.10
EX 10.000
_
10.015 10.10
Valve rocker arm shaft IN 9.972
_
9.987 9.91
O.D.
EX 9.972
_
9.987 9.91
IN 1.0 1.8
EX 1.0 1.8
IN 4.975
_
4.990 4.90
EX 4.955
_
4.970 4.90
IN 5.000
_
5.012 5.03
EX 5.000
_
5.012 5.03
Valve stem-to-guide IN 0.010
_
0.037 0.08
clearance
EX 0.030
_
0.057 0.10
Valve clearance (cold)
Valve rocker arm I.D.
Valve stem O.D.
Valve guide I.D.
SERVICE INFORMATION.....................7-1 VALVE GUIDE REPLACEMENT...........7- 9
TROUBLESHOOTING............................7-2 VALVE SEAT INSPECTION & REFACING.....7-10
CAMSHAFT REMOVAL........................7-3 CYLINDER HEAD ASSEMBLY..............7-12
CYLINDER HEAD REMOVAL..............7-6 CYLINDER HEAD INSTALLATION.....7-13
CYLINDER HEAD DISASSEMBLY.......7-7 CAMSHAFT INSTALLATION...............7-14
Camshaft cam height
Valve seat width