KYMCO SR25BA - Page 91

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SERVICE INFORMATION.............................. 7
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1
TROUBLESHOOTING
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CAMSHAFT REMOVAL
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7
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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 surface for initial lubrication.
The camshaft is lubricated by engine oil through the cylinder head engine oil passages. Clean 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.
7. CYLINDER HEAD/VALVES
15 kg/cm - 570 rpm
SPECIFICATIONS
Item Standard (mm)
Valve clearance (cold)
IN
EX
Cylinder head compression
Cylinder head warpage
Camshaft cam height
Valve rocker arm I.D
IN
EX
IN
EX
Valve rocker arm
shaft O.D
IN
EX
Valve seat width
IN
EX
Valve stem O.D
IN
EX
Valve guide I.D
IN
EX
Valve stem-to-guide
clearance
IN
EX
25.965
25.810
10.000-10.015
10.000-10.015
9.972-9.987
9.972-9.987
1.0
1.0
0.12
0.12
4.955-4.970
4.955-4.970
5.000-5.012
5.000-5.012
0.010-0.037
0.030-0.057
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CYLINDER HEAD REMOVAL
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CYLINDER HEAD DISASSEMBLY
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CYLINDER HEAD INSTALLATION
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CYLINDER HEAD INSPECTION
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CAMSHAFT INSTALLATION
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