KYMCO Dink 50, Service Manual

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6
. CYLINDER HEAD/VALVES
6-3
DINK 50/ 125
SERVICE INFORMATION
GENERAL INSTRUCTIONS
•
The cylinder head can be serviced with the engine installed in the frame. Coolant in the radiator
and water jacket must be drained first.
•
When assembling, apply molybdenum disulfide grease or engine oil to the valve guide movable
parts and valve arm sliding surfaces for initial lubrication.
•
The valve rocker arms are 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(DINK 125)
Unit: mm (in)
Item Standard Service Limit
IN 0.1 (0.004)
⎯
EX 0.1 (0.004)
⎯
Cylinder head compression pressure 15 kg/cm
²
(1500 kpa, 213 psi)
⎯
Cylinder head warpage
⎯
0.05 (0.002)
IN 30.8763 (1.235052) 30.75 (1.23)
EX 30.4081 (1.216324) 30.26 (1.2104)
IN 10
～
10.018 (0.4
～
0.40072) 10.1 (0.404)
EX 10
～
10.018 (0.4
～
0.40072) 10.1 (0.404)
Valve rocker arm shaft IN 9.972
～
9.987 (0.39888
～
0.39948) 9.9 (0.396)
O.D. EX 9.972
～
9.987 (0.39888
～
0.39948) 9.9 (0.396)
IN 4.99
～
4.975 (0.1996
～
0.199) 4.925 0.197)
EX 4.97
～
4.955 (0.1988
～
0.1982) 4.915 (0.1966)
IN 5
～
5.012 (0.2
～
0.20048) 5.03 (0.2012)
EX 5
～
5.012 (0.2
～
0.20048) 5.03 (0.2012)
Valve stem-to-guide IN 0.01
～
0.037 (0.0004
～
0.00148) 0.08 (0.0032)
clearance EX 0.03
～
0.057 (0.0012
～
0.00228) 0.1 (0.004)
clearance EX
Valve clearance (cold)
Camshaft cam height
Valve rocker arm I.D.
Valve stem O.D.
Valve guide I.D.