2005 Polaris Sportsman 400/500 Service Manual, Page 75Get this manual
ROCKER ARMSHAFT INSPECTION, CONT
Rocker Shaft Oil Clearance: Std: .0008-.0021I (.020-.054 mm) Limit: .0039I (.10 mm) 5Measure I.Dof both rocker arm shaft supports and visually inspect surfaceCompare to specifications6Subtract rocker shaft O.Dfrom rocker armshaft support I.DThis is the oil clearanceCompare to specifications7Inspect rocker adjuster screws for wear, pitting, or damage to threads of the adjuster or locknutReplace all worn or damaged partsNOTE: The end of the adjuster screw is hardened and cannot be ground or re-faced