2008 Yamaha Raptor 250SE / 250SE2 Factory Service Manual, Page 144Get this manual
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VALVES AND VALVE SPRINGS
3 Measure: 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 (2.5