7. CYLINDER HEAD/VALVES
(90cc/70cc/50cc-4T)
7-3
50cc-4T mm (in)
Item Standard Service Limit
IN 0.04 (0.0016) ⎯
Valve clearance (cold)
EX 0.04 (0.0016) ⎯
Cylinder head compression pressure 14 kg/cm²(1400 kpa, 198.8 psi) ⎯
Cylinder head warpage ⎯ 0.05 (0.002)
IN 25.761 (1.03044) 25.65 (1.026)
Camshaft cam height
EX 25.563 (1.02252) 25.45 (1.018)
Valve rocker arm to shaft clearance
0.034～0.09 (0.00136～0.0036) 0.1 (0.004)
Valve stem-to-guide IN 0.01～0.037 (0.0004～0.00148) 0.06 (0.0024)
clearance
EX 0.025～0.052 (0.001～0.00208) 0.08 (0.0032)
Valve spring free length 35.25 (1.41) 34 (1.36)
Valve spring compressed force 19.2～22 kg at 19.65 mm (0.786 in) ⎯
TORQUE VALUES
Cylinder head cover bolt 10 N-m (1 kgf-m, 7 lbf-ft)
Cam shaft hold nut (90cc) 20 N-m (2 kgf-m, 14 lbf-ft) Apply engine oil to threads
Cam shaft hold nut (70cc/50cc-4T) 14 N-m (1.4 kgf-m, 10 lbf-ft) Apply engine oil to threads
Tappet adjusting nut 9 N-m (0.9 kgf-m, 6.5 lbf-ft) Apply engine oil to threads
SPECIAL TOOLS
Valve spring compressor A120E00040
Tappet adjuster A120E00012
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