Yamaha YP125R, Service Manual

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ENGINE SPECIFICATIONS (YP125R)
2-4
Camshaft runout limit 0.030 mm (0.0012 in)
Timing chain
Tensioning system Automatic
Rocker arm/rocker arm shaft
Rocker arm inside diameter 9.985–10.000 mm (0.3931–0.3937 in)
Limit 10.015 mm (0.3943 in)
Rocker arm shaft outside diameter 9.966–9.976 mm (0.3924–0.3928 in)
Limit 9.940 mm (0.3913 in)
Rocker-arm-to-rocker-arm-shaft clearance 0.009–0.034 mm (0.0004–0.0013 in)
Limit 0.075 mm (0.0030 in)
Valve, valve seat, valve guide
Valve clearance (cold)
Intake 0.10–0.14 mm (0.0039–0.0055 in)
Exhaust 0.22–0.26 mm (0.0087–0.0102 in)
Valve dimensions
Valve head diameter A (intake) 19.40–19.60 mm (0.7638–0.7717 in)
Valve head diameter A (exhaust) 16.90–17.10 mm (0.6654–0.6732 in)
Valve face width B (intake) 1.680–2.120 mm (0.0661–0.0835 in)
Valve face width B (exhaust) 1.480–2.190 mm (0.0583–0.0862 in)
Valve seat width C (intake) 0.90–1.10 mm (0.0354–0.0433 in)
Limit 1.6 mm (0.06 in)
Valve seat width C (exhaust) 0.90–1.10 mm (0.0354–0.0433 in)
Limit 1.6 mm (0.06 in)
Valve margin thickness D (intake) 0.85–1.15 mm (0.0335–0.0453 in)
Limit 0.5 mm (0.02 in)
Valve margin thickness D (exhaust) 0.85–1.15 mm (0.0335–0.0453 in)
A
B
C