Page 206 - Manual_Polaris_RZR_ProXP-20-21

ENGINE / COOLING SYSTEM

8. If the indicated seat contact is at the top edge of the 13.Lubricate valve guides with clean engine oil and apply
valve face and contacts the margin area e it is too oil or water based lapping compound to the face of
high on the valve face. Use the 30° cutter to lower the the valve.
valve seat.
NOTICE
NOTICE
Lapping is not required if an interference angle
The exhaust valve seats are stellite and will be very reconditioning method is used.
difficult to cut.

14.Insert the valve into its respective guide and lap using
NOTICE a lapping tool or a section of fuel line connected to the
When using an interference angle, the seat contact valve stem.
point on the valve will be very narrow, and is a normal 15.Rotate the valve rapidly back and forth until the cut
condition. Look for an even and continuous contact sounds smooth. Lift the valve slightly off of the seat,
point all the way around the valve face w. rotate 1/4 turn, and repeat the lapping process. Do
this four to five times until the valve is fully seated,
and repeat process for the other valve(s).
16.Thoroughly clean cylinder head and valves.

9. If too low, use the 60° cutter to raise the seat. When
contact area is centered on the valve face, measure
seat width.
10.If the seat is too wide or uneven, use both top and
bottom cutters to narrow the seat.
MEASUREMENT
Valve Seat Width:
Intake: .0393 ± .0039" (1.0 ± 0.10 mm)
Service Limit: .0551" (1.4 mm)

Exhaust: .0590 ± .0039" (1.5 ± 0.10 mm)
Service Limit: .0748" (1.9 mm)

11. If the seat is too narrow, widen using the 45° cutter
and re-check contact point on the valve face and seat
width after each cut.
12.Clean all filings from the area with hot soapy water.
Rinse and dry with compressed air.

3.62 9930583 R01 - 2020-2021 RZR PRO XP / XP 4 Service Manual
© Copyright Polaris Industries Inc.