Yamaha YP125R, Service Manual

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ENGINE SPECIFICATIONS (YP125R)
2-3
Radiator cap opening pressure 100.0–120.0 kPa (1.00–1.20 kgf/cm², 14.5–17.4
psi)
Thermostat
Valve opening temperature 70.5–73.5 °C (158.9–164.3 °F)
Valve full open temperature 85.0 °C (185.0 °F)
Valve lift (full open) 3.0 mm (0.12 in)
Radiator core
Width 244.0 mm (9.61 in)
Height 128.9 mm (5.07 in)
Depth 22.0 mm (0.87 in)
Water pump
Water pump type Single suction centrifugal pump
Reduction ratio 16/38 (0.42)
Impeller shaft tilt limit 0.15 mm (0.0059 in)
Spark plug (s)
Manufacturer/model NGK/CPR9EA-9
Spark plug gap 0.8–0.9 mm (0.031–0.035 in)
Cylinder head
Volume 9.90–10.50 cm³ (0.60–0.64 cu.in)
Warpage limit 0.05 mm (0.0020 in)
Camshaft
Drive system Chain drive (left)
Camshaft lobe dimensions
Intake A 30.225–30.325 mm (1.1900–1.1939 in)
Limit 30.125 mm (1.1860 in)
Intake B 25.064–25.164 mm (0.9868–0.9907 in)
Limit 24.964 mm (0.9828 in)
Exhaust A 30.261–30.361 mm (1.1914–1.1953 in)
Limit 30.161 mm (1.1874 in)
Exhaust B 25.121–25.221 mm (0.9890–0.9930 in)
Limit 25.021 mm (0.9851 in)
A
B