2009 Polaris Sportsman 850 XP EFI EPS Service Manual, Page 119Get this manual
ENGINE Rocker ArmRocker Arm Shaft Inspection
12Mark or tag rocker arms and shafts to keep them in their respective locations for assemblySlide rocker arm shafts from carrier4Measure I.Dof rocker arms and O.Dof rocker arm shaftsMeasure shaft bore in cam carrierCompare to specifications (See "Engine SpecificationsEH085OLE011" on page 5.5)3Inspect each rocker arm rollerRoller surface should be smooth and radial movement should be minimalRoll smooth flat rod across the roller, applying firm downward pressure on roller while observing roller movementRoller should turn smoothly without bindingReplace rocker arm if roller surface is damaged, or if roller does not turn smoothlyFlat stock