2008 Polaris ATV Predator 50, Sportsman Outlaw 90 Service Manual, Page 63Get this manual
ENGINETRANSMISSION 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 on the black marker, all the way around the valve face
Cylinder Head Assembly CAUTION
Wear eye and face protection during assemblyNOTE: Assemble the valves one at time to maintain proper order
Seat Width
Install new valve seals on valve guides