2008 Yamaha Raptor 250SE / 250SE2 Factory Service Manual, Page 144Get this manual
VALVES AND VALVE SPRINGS
3Measure: Valve spring tilt Out of specificationReplace the valve springInner spring Spring tilt (intake) 2.51.60 mm (2.50.063 in) Spring tilt (exhaust) 2.51.60 mm (2.50.063 in) Outer spring Spring tilt (intake) 2.51.60 mm (2.50.063 in) Spring tilt (exhaust) 2.51.60 mm (2.50.063 in)