KYMCO Dink 50, Service Manual

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6
. CYLINDER HEAD/VALVES
6-5
DINK 50/ 125
TORQUE VALUES
(DINK 125)
Cylinder head cover bolt 1.2 kgf-m (12 N-m, 8.6 lbf-ft)
Tensioner mounting bolt 0.9 kgf-m (9 N-m, 6.5 lbf-ft)
Tensioner sealing bolt 0.9 kgf-m (9 N-m, 6.5 lbf-ft)
Cylinder head cap nut 2.2 kgf-m (22 N-m, 15.8 lbf-ft) Apply engine oil to threads
Cylinder head bolt 1 kgf-m (10 N-m, 7.2 lbf-ft)
SPECIAL TOOLS
Valve spring compressor A120E00040
TROUBLESHOOTING
•
The poor cylinder head operation can be diagnosed by a compression test or by tracing engine
top-end noises.
Poor performance at idle speed White smoke from exhaust muffler
•
Compression too low
•
Worn valve stem or valve guide
•
Damaged valve stem oil seal
Compression too low
•
Incorrect valve clearance adjustment Abnormal noise
•
Burned or bend valves
•
Incorrect valve clearance adjustment
•
Incorrect valve timing
•
Sticking valve or broken valve spring
•
Broken valve spring
•
Damaged or worn camshaft
•
Poor valve and seat contact
•
Worn cam chain tensioner
•
Leaking cylinder head gasket
•
Worn camshaft and rocker arm
•
Warped or cracked cylinder head
•
Poorly installed spark plug
Compression too high
•
Excessive carbon build-up in combustion
chamber