Yamaha FZ8NA Service Manual page 54

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 (intake)
Spring tilt (exhaust)
Winding direction (intake)
Winding direction (exhaust)
Cylinder
Bore
Taper limit
Out of round limit
Piston
Piston-to-cylinder clearance
Limit
Diameter D
Height H
Offset
Offset direction
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
38.62 mm (1.52 in)
36.69 mm (1.44 in)
33.00 mm (1.30 in)
33.00 mm (1.30 in)
24.99 N/mm (2.55 kgf/mm, 142.69 lb/in)
37.28 N/mm (3.80 kgf/mm, 212.87 lb/in)
24.99 N/mm (2.55 kgf/mm, 142.69 lb/in)
37.28 N/mm (3.80 kgf/mm, 212.87 lb/in)
130.60–150.20 N (13.32–15.32 kgf, 29.36–
33.76 lbf)
130.60–150.20 N (13.32–15.32 kgf, 29.36–
33.76 lbf)
2.5°/1.7 mm (0.067 in)
2.5°/1.7 mm (0.067 in)
Clockwise
Clockwise
68.000–68.010 mm (2.6772–2.6776 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)
67.975–67.990 mm (2.6762–2.6768 in)
11.5 mm (0.45 in)
0.25 mm (0.0098 in)
Intake side
17.002–17.013 mm (0.6694–0.6698 in)
17.043 mm (0.6710 in)
16.990–16.995 mm (0.6689–0.6691 in)
16.970 mm (0.6681 in)
0.007–0.023 mm (0.0001–0.0009 in)
0.073 mm (0.0029 in)
Barrel
0.90 × 2.60 mm (0.04 × 0.10 in)
2-5