2008 Polaris ATV Sportsman 300 400 H.O. Service Manual, Page 53Get this manual
ENGINE (300) Engine Service Data
Cylinder HeadValvetrain
In Lobe Height Ex Camshaft Journal O.DJournal O.DJournal Bore I.DJournal Bore I.DCamshaft Journal Oil Clearance Camshaft Chain Cylinder Head Rocker ArmShaft Surface Warpage Limit Rocker arm ID Rocker shaft OD Oil Clearance (Limit) Valve Clearance In Ex In Valve Seat Angle Contacting Width Ex Std Std Std Limit Std Limit In Stem Diameter Valve Ex Limit Stem Length Margin Inner Diameter Stem to Guide Oil Clearance Valve Spring Free Length Squareness In Ex In Ex Limit Limit In Ex Limit Std Limit Std Limit PTO MAG PTO MAG Std Limit
ES300PFE012
1.2938-1.2977" (32.86332.963mm) 1.2820" (32.563 mm) 1.2938-1.2977" (32.86332.963mm) 1.2820" (32.563 mm) 1.0998-1.1004" (27.935-27.950mm) 1.5328-1.5334" (38.935-38.950mm) 1.1025-1.1033" (28.005-28.025mm) 1.5356-1.5364" (39.005-39.025mm) .0021-.0035" (.055.090mm) .0039" (.10mm)