2008 Yamaha Raptor 250SE / 250SE2 Factory Service Manual, Page 145Get this manual

2008 Yamaha Raptor 250SE / 250SE2 Factory Service Manual, Page 145

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VALVES AND VALVE SPRINGS

5 To secure the valve cotters onto the valve stem, lightly tap the valve tip with softface hammer
CAUTION:
Hitting the valve tip with excessive force