Yamaha XT250X 2008, Service Manual, Page: 24 / 282

ENGINE SPECIFICATIONS
2-5
Winding direction (intake) Counter clockwise
Winding direction (exhaust) Counter clockwise
Outer spring
Free length (intake) 36.63 mm (1.44 in)
Limit 34.63 mm (1.36 in)
Free length (exhaust) 36.63 mm (1.44 in)
Limit 34.63 mm (1.36 in)
Installed length (intake) 32.00 mm (1.26 in)
Installed length (exhaust) 32.00 mm (1.26 in)
Spring rate K1 (intake) 30.90 N/mm (176.44 lb/in) (3.15 kgf/mm)
Spring rate K2 (intake) 40.80 N/mm (232.97 lb/in) (4.16 kgf/mm)
Spring rate K1 (exhaust) 30.90 N/mm (176.44 lb/in) (3.15 kgf/mm)
Spring rate K2 (exhaust) 40.80 N/mm (232.97 lb/in) (4.16 kgf/mm)
Installed compression spring force (intake) 128.50–157.90 N (28.89–35.50 lbf)
(13.10–16.10 kgf)
Installed compression spring force (exhaust) 128.50–157.90 N (28.89–35.50 lbf)
(13.10–16.10 kgf)
Spring tilt (intake) 2.5
°
/1.6 mm
Spring tilt (exhaust) 2.5
°
/1.6 mm
Winding direction (intake) Clockwise
Winding direction (exhaust) Clockwise
Cylinder
Bore 74.000–74.016 mm (2.9134–2.9140 in)
Wear limit 74.100 mm (2.9173 in)
Taper limit 0.050 mm (0.0020 in)
Out of round limit 0.010 mm (0.0004 in)
Warp limit 0.10 mm (0.0039 in)
Piston
Piston-to-cylinder clearance 0.010–0.025 mm (0.0004–0.0010 in)
Limit 0.15 mm (0.0059 in)
Diameter D 73.983–73.998 mm (2.9127–2.9133 in)
Height H 11.0 mm (0.43 in)
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