Yamaha XG250 Service Manual page 21

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
Wear limit
Taper limit
Out of round limit
Warp limit
ENGINE SPECIFICATIONS
2.5 °/1.6 mm
2.5 °/1.6 mm
Counter clockwise
Counter clockwise
36.63 mm (1.44 in)
34.63 mm (1.36 in)
36.63 mm (1.44 in)
34.63 mm (1.36 in)
32.00 mm (1.26 in)
32.00 mm (1.26 in)
30.90 N/mm (176.44 lb/in) (3.15 kgf/mm)
40.80 N/mm (232.97 lb/in) (4.16 kgf/mm)
30.90 N/mm (176.44 lb/in) (3.15 kgf/mm)
40.80 N/mm (232.97 lb/in) (4.16 kgf/mm)
128.50–157.90 N (28.89–35.50 lb) (13.10–16.10 kgf)
128.50–157.90 N (28.89–35.50 lb) (13.10–16.10 kgf)
2.5 °/1.6 mm
2.5 °/1.6 mm
Clockwise
Clockwise
74.000–74.010 mm (2.9134–2.9138 in)
74.100 mm (2.9173 in)
0.050 mm (0.0020 in)
0.010 mm (0.0004 in)
0.10 mm (0.0039 in)
2-5