Yamaha YZFR1Y(C) 2009 Service Manual page 42

Valve spring
Inner spring
Free length (intake)
Limit
Free length (exhaust)
Limit
Installed length (intake)
Installed length (exhaust)
Spring rate K1 (intake)
Spring rate K2 (intake)
Spring rate K1 (exhaust)
Spring rate K2 (exhaust)
Installed compression spring force (intake)
Installed compression spring force (exhaust)
Spring tilt limit (intake)
Spring tilt limit (exhaust)
Winding direction (intake)
Winding direction (exhaust)
Cylinder
Bore
Taper limit
Out of round limit
Piston
Piston-to-cylinder clearance
Limit
Piston diameter
Height H
Offset
Piston pin bore inside diameter
Limit
Piston pin outside diameter
Limit
Piston-pin-to-piston-pin-bore clearance
Limit
Piston ring
Top ring
Ring type
Dimensions (B × T)
ENGINE SPECIFICATIONS
39.33 mm (1.55 in)
37.36 mm (1.47 in)
37.96 mm (1.49 in)
36.06 mm (1.42 in)
34.50 mm (1.36 in)
33.00 mm (1.30 in)
41.57 N/mm (4.24 kgf/mm, 237.36 lbf/in)
55.62 N/mm (5.67 kgf/mm, 317.59 lbf/in)
40.10 N/mm (4.09 kgf/mm, 228.97 lbf/in)
59.31 N/mm (6.05 kgf/mm, 338.66 lbf/in)
187.00–215.00 N (19.07–21.92 kgf, 42.04–
48.33 lbf)
185.00–213.00 N (18.86–21.72 kgf, 41.59–
47.88 lbf)
2.5°/1.7 mm (0.067 in)
2.5°/1.7 mm (0.067 in)
Clockwise
Clockwise
78.000–78.010 mm (3.0709–3.0713 in)
0.050 mm (0.0020 in)
0.050 mm (0.0020 in)
0.010–0.035 mm (0.0004–0.0014 in)
0.150 mm (0.0059 in)
77.975–77.990 mm (3.0699–3.0705 in)
12.0 mm (0.47 in)
0.00 mm (0.0000 in)
17.002–17.013 mm (0.6694–0.6698 in)
17.043 mm (0.6710 in)
16.991–17.000 mm (0.6689–0.6693 in)
16.971 mm (0.6682 in)
0.002–0.022 mm (0.0001–0.0009 in)
0.072 mm (0.0028 in)
Barrel
0.90 × 2.75 mm (0.04 × 0.11 in)
2-5