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7. CYLINDER HEAD/VALVES PEOPLE 125/150
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.
SPECIFICATIONS
Standard (mm) Service Limit (mm)
Item
125cc 150cc 125cc 150cc
IN 0.10 0.10
Valve clearance (cold)
EX 0.10 0.10
Cylinder head compression pressure 13 (kg/cm) 15 (kg/cm)
Cylinder head warpage
IN 29.7064 29.803 29.3 29.4
Camshaft cam height
EX 29.4251 29.4388 29.15 29.05
IN 10.000-10.015 10.10
Valve rocker arm I.D.
EX 10.00-10.015 10.10
Valve rocker arm shaft IN 9.972-9.987 9.91
O.D. EX 9.972-9.987 9.91
IN 1.0 1.8
Valve seat width
EX 1.0 1.8
IN 4.975-4.990 4.90
Valve stem O.D.
EX 4.975-4.990 4.90
IN 5.000-5.012 5.30
Valve guide I.D.
EX 5.000-5.012 5.30
Valve stem-to-guide IN 0.10-0.037 0.08
clearance EX 0.030-0.057 0.10
7-2