7. CYLINDER HEAD/VALVES AGILITY 125
SERVICE INFORMATION...................... 7-1 CYLINDER HEAD DISASSEMBLY.......7-7
TROUBLESHOOTING ............................ 7-2 CYLINDER HEAD ASSEMBLY .............7-8
CAMSHAFT REMOVAL......................... 7-3 CYLINDER HEAD INSTALLATION .....7-8
CYLINDER HEAD REMOVAL .............. 7-5 CAMSHAFT INSTALLATION................7-9
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
Valve clearance (cold)
EX 0.12
Cylinder head compression pressure 13kg/cm
Cylinder head warpage
IN 29.803 29.40
Camshaft cam height
EX 29.5637 29.16
Valve rocker arm I.D. IN 10.00010.015 10.10
EX 10.00010.015 10.10
Valve rocker arm shaft IN 9.9729.987 9.91
O.D. EX 9.9729.987 9.91
Valve seat width IN 1.0 1.8
EX 1.0 1.8
Valve stem O.D. IN 4.9754.990 4.90
EX 4.9554.970 4.90
Valve guide I.D. IN 5.0005.012 5.03
EX 5.0005.012 5.03
Valve stem-to-guide IN 0.0100.037 0.08
clearance EX 0.0300.057 0.10
7-1
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