Yamaha YP125R, Руководство по обслуживанию

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ENGINE SPECIFICATIONS (YP250R)
2-52
Spring rate K1 (intake) 23.18 N/mm (2.36 kgf/mm, 132.36 lb/in)
Spring rate K2 (intake) 31.66 N/mm (3.23 kgf/mm, 180.78 lb/in)
Spring rate K1 (exhaust) 23.18 N/mm (2.36 kgf/mm, 132.36 lb/in)
Spring rate K2 (exhaust) 31.66 N/mm (3.23 kgf/mm, 180.78 lb/in)
Installed compression spring force (intake) 115–133 N (11.73–13.56 kgf, 25.85–29.90 lbf)
Installed compression spring force (exhaust) 115–133 N (11.73–13.56 kgf, 25.85–29.90 lbf)
Spring tilt (intake) 2.5°/1.6 mm
Spring tilt (exhaust) 2.5°/1.6 mm
Winding direction (intake) Clockwise
Winding direction (exhaust) Clockwise
Cylinder
Bore 69.000–69.005 mm (2.7165–2.7167 in)
Wear limit 69.100 mm (2.7205 in)
Taper limit 0.030 mm (0.0012 in)
Out of round limit 0.030 mm (0.0012 in)
Warp limit 0.05 mm (0.0020 in)
Piston
Piston-to-cylinder clearance 0.020–0.040 mm (0.0008–0.0016 in)
Limit 0.15 mm (0.0059 in)
Diameter D 68.965–68.980 mm (2.7152–2.7157 in)
Height H 5.0 mm (0.20 in)
Offset 0.50 mm (0.0197 in)
Offset direction Intake side
Piston pin bore inside diameter 17.004–17.015 mm (0.6694–0.6699 in)
Limit 17.045 mm (0.6711 in)
Piston pin outside diameter 16.991–17.000 mm (0.6689–0.6693 in)
Limit 16.971 mm (0.6681 in)
Piston-pin-to-piston-pin-bore clearance 0.004–0.024 mm (0.0002–0.0009 in)
Limit 0.074 mm (0.0029 in)
Piston ring
Top ring
Ring type Barrel
H
D