2008 Polaris Sportsman 700/800/700 X2 EFI Service Manual, Page 79Get this manual
ENGINE 4Inspect the cut area of the seat: NOTE: When using an interference angle, the seat contact point on the valve will be very narrow, and is normal conditionLook for an even and continuous contact point all the way around the valve face(B)
If the contact area is less than 75 of the circumference of the seat, rotate the pilot 180 and make another light cut If the cutter now contacts the uncut portion of the seat, check the pilotLook for burrs, nicks, or runoutIf the pilot is bent it must be replaced If the contact area of the cutter is in the same place, the valve guide is distorted from improper installationIf 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 of material necessary to repair the seat surface5To check the contact area of the seat on the valve face, apply thin coating of Prussian Blue paste to the valve seatIf using an interference angle (46apply black permanent marker to the entire valve face (A)