2012 Sportsman 400/500 and EFI Tractor Service Manual 9923412, Page 83Get this manual

2012 Sportsman 400/500 and EFI Tractor Service Manual 9923412, Page 83

ENGINE 16Remove valve and check where the Prussian BlueTM indicates seat contact on the valve faceThe valve seat should contact
on the black marked area, all the way around the valve face17Clean all filings from the area with hot soapy water, rinse,
and dry with compressed air18Lubricate the valve guides with clean engine oil, and apply oil or water based lapping compound
to the face of the valveLapping is not required with an interference angle19Insert the valve into its respective guide and
lap using lapping tool or section of fuel line connected to the valve stem20Rotate the valve rapidly back and forth until
the cut sounds smoothLift the valve slightly off of the seat, rotate 14 turn, and repeat the lapping processDo this four
to five times until the valve is fully seated, and repeat process for the other valve(s)21Clean cylinder head, valves, and
camshaft oil supply passage (A) thoroughlyA Seat Width 22If oil passage blind plug was removed, apply Crankcase Sealant (PN