2009 Polaris Sportsman 850 XP EFI EPS Service Manual, Page 122Get this manual

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ENGINE Valve Inspection
= In mmValve Stem Diameter: Intake: 0.2356"0.00039" (5.9850.01 mm) Exhaust: 0.2351"0.00039" (5.9720.01 mm) 6 Measure valve guide inside diameter at the top middle and end