2012 Sportsman 400/500 and EFI Tractor Service Manual 9923412, Page 82Get this manual

2012 Sportsman 400/500 and EFI Tractor Service Manual 9923412, Page 82

ENGINE 7Place new guide in the valve guide installation tool and press guide in to proper depthCheck height of each guide
must be replaced If the contact area of the cutter is in the same place, the valve guide is distorted from improper installation
and must be replacedBe sure the cylinder head is at the proper temperature and replace the guide If the contact area of the
initial cut is greater than 75, continue to cut the seat until all pits are removed and new seat surface is evidentNOTE:
Remove only the amount necessary to repair the seat surfaceof material 14To check the contact area of the seat on the valve
face, apply thin coating of Prussian BlueTM paste to the valve seatIf using an interference angle (46o) apply black permanent
marker to the entire valve face (A)9Clean guides thoroughly with hot soapy water and nylon brushRinse and dry with compressed
airApply clean engine oil to guides10Install pilot into valve guide11Apply cutting oil to valve seat and cutter 15Insert