Yamaha SR400 2014 Service Manual page 31

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)
Outer 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 (intake)
Spring tilt (exhaust)
Winding direction (intake)
Winding direction (exhaust)
Cylinder
Bore
Taper limit
Out of round limit
Piston
Piston-to-cylinder clearance
Diameter
Measuring point (from piston skirt bottom)
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
End gap (installed)
Limit
Ring side clearance
Limit
ENGINE SPECIFICATIONS
43.00 mm (1.69 in)
38.00 mm (1.50 in)
38.00 mm (1.50 in)
16.40 N/mm (1.67 kgf/mm, 93.64 lbf/in)
20.80 N/mm (2.12 kgf/mm, 118.77 lbf/in)
16.40 N/mm (1.67 kgf/mm, 93.64 lbf/in)
20.80 N/mm (2.12 kgf/mm, 118.77 lbf/in)
119.64 N (12.20 kgf, 26.90 lbf)
119.64 N (12.20 kgf, 26.90 lbf)
1.9 mm (0.07 in)
1.9 mm (0.07 in)
Counterclockwise
Counterclockwise
44.60 mm (1.76 in)
42.00 mm (1.65 in)
44.60 mm (1.76 in)
42.00 mm (1.65 in)
40.00 mm (1.57 in)
40.00 mm (1.57 in)
35.30 N/mm (3.60 kgf/mm, 201.56 lbf/in)
45.40 N/mm (4.63 kgf/mm, 259.23 lbf/in)
35.30 N/mm (3.60 kgf/mm, 201.56 lbf/in)
45.40 N/mm (4.63 kgf/mm, 259.23 lbf/in)
160.83 N (16.40 kgf, 36.15 lbf)
160.83 N (16.40 kgf, 36.15 lbf)
1.9 mm (0.07 in)
1.9 mm (0.07 in)
Clockwise
Clockwise
87.000–87.015 mm (3.4252–3.4258 in)
0.050 mm (0.0020 in)
0.010 mm (0.0004 in)
0.049–0.055 mm (0.0019–0.0022 in)
86.948–86.963 mm (3.4231–3.4237 in)
7.2 mm (0.28 in)
20.004–20.015 mm (0.7876–0.7880 in)
20.045 mm (0.7892 in)
19.995–20.000 mm (0.7872–0.7874 in)
19.975 mm (0.7864 in)
0.004–0.020 mm (0.0002–0.0008 in)
0.070 mm (0.0028 in)
Barrel
0.30–0.50 mm (0.0118–0.0197 in)
0.80 mm (0.0315 in)
0.030–0.080 mm (0.0012–0.0032 in)
0.150 mm (0.0059 in)
2-4