2012 Sportsman 400/500 and EFI Tractor Service Manual 9923412, Page 107Get this manual
ENGINE 4Loop the cam chain on the cam sprocket with the dots on the sprocket facing outward and the alignment pin notch facing directly upwardPin Notch 7Verify TDC mark in timing inspection hole and alignment pin is directly in line with crankshaft to camshaft centerlineRefer to Illustration on the following page8Apply Crankcase Sealant (PN 2871557) to the camshaft end cap and install using new O-Ring9Check all cam timing marks to verify proper cam timing, and install the cam chain tensioner body with new gasket10After tensioner installation, rotate engine at least two revolutions and re-check markstiming