2008 Yamaha Raptor 250SE / 250SE2 Factory Service Manual, Page 160Get this manual
CHECKING THE CLUTCH SPRINGS The following procedure applies to all of the clutch springs1Check: Clutch spring DamageReplace the clutch spring2Measure: Clutch spring free length Out of specificationReplace the clutch springClutch spring free length 47.80 mm (1.88 in) Minimum length 46.50 mm (1.83 in)