Yamaha RAPTOR YFM125RA Service Manual page 29

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)
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)
End gap (installed)
Limit
Ring side clearance
Limit
ENGINE SPECIFICATIONS
47.06 mm (1.85 in)
44.71 mm (1.76 in)
25.60 mm (1.01 in)
25.60 mm (1.01 in)
8.01 N/mm (0.82 kgf/mm, 45.74 lbf/in)
9.33 N/mm (0.95 kgf/mm, 53.27 lbf/in)
8.01 N/mm (0.82 kgf/mm, 45.74 lbf/in)
9.33 N/mm (0.95 kgf/mm, 53.27 lbf/in)
160.00–184.00 N (16.32–18.76 kgf, 35.97–
41.36 lbf)
160.00–184.00 N (16.32–18.76 kgf, 35.97–
41.36 lbf)
2.5°/2.1 mm (0.08 in)
2.5°/2.1 mm (0.08 in)
Clockwise
Clockwise
0.019–0.035 mm (0.0007–0.0014 in)
0.15 mm (0.006 in)
53.997–54.029 mm (2.1259–2.1271 in)
4.5 mm (0.18 in)
0.50 mm (0.0197 in)
Intake side
15.002–15.013 mm (0.5906–0.5911 in)
15.043 mm (0.5922 in)
14.991–15.000 mm (0.5902–0.5906 in)
14.971 mm (0.5894 in)
0.002–0.022 mm (0.0001–0.0009 in)
0.072 mm (0.0028 in)
Barrel
1.00 × 2.10 mm (0.04 × 0.08 in)
0.15–0.30 mm (0.006–0.012 in)
0.40 mm (0.0157 in)
0.035–0.070 mm (0.0014–0.0028 in)
0.120 mm (0.0047 in)
2-6