2012 Sportsman 400/500 and EFI Tractor Service Manual 9923412, Page 81Get this manual

2012 Sportsman 400/500 and EFI Tractor Service Manual 9923412, Page 81

ENGINE NOTE: If valve guides are replaced, valve seats must be reconditionedRefer to the "Valve Seat Reconditioning" procedureValve
Chamber Clean all accumulated carbon deposits from combustion chamber and valve seat area with soft wire brush Valve Seat
Reconditioning Valve Seat Inspection Inspect valve seat in cylinder head for pitting, burnt spots, roughness, and uneven
surfaceIf any of the above conditions exist, the valve seat must be reconditionedIf the valve seat is cracked the cylinder
head must be replacedCylinder Head Reconditioning NOTE: Servicing the valve guides and valve seats requires special tools
and thorough knowledge of reconditioning techniquesFollow the instructions provided in the cylinder head service tool kitToo
Wide Uneven Good Too Narrow CAUTION Wear eye protection when performing cylinder head serviceValve guide replacement will
require heating of the cylinder headWear gloves to prevent burns NOTE: Valve seat width and point of contact on the valve