Service Information - KYMCO Downtown 125i 2009 Service Manual

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6
. CYLINDER HEAD/VALVES

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
Valve clearance (cold)
Cylinder head compression pressure
Cylinder head warpage
Camshaft cam height
Valve rocker arm I.D.
Valve rocker arm shaft
O.D.
Valve stem O.D.
Valve guide I.D.
Valve stem-to-guide
clearance
TORQUE VALUES
Cylinder head cover bolt
Tensioner mounting bolt
Tensioner sealing bolt
Cylinder head cap nut
Cylinder head bolt
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Item
IN
EX
IN
EX
IN
EX
IN
EX
IN
EX
IN
EX
IN
EX
0.8~0.9 kgf-m
0.9 kgf-m
0.9 kgf-m
2 kgf-m
0.7~1.1 kgf-m
0.1
0.1
15kg/cm²
25.965
25.810
10.0~10.015
10.0~10.015
9.972~9.987
9.972~9.987
4.975~4.970
4.975~4.970
5.0~5.012
5.0~5.012
0.010~0.037
0.030~0.057
Apply engine oil to threads
DOWNTOWN 125i
Unit: mm
Standard
⎯
6-2