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9850068 R01 - 2020-2021 RZR PRO XP / XP 4 Service Manual
© Copyright Polaris Industries Inc.
3.61
4. Inspect the cut area of the seat:
• 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 pilot. Look for burrs, nicks, or runout. If 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 installation.
• If the contact area of the initial cut is greater than 75%,
continue to cut the seat until all pits are removed and a
new seat surface is evident.
NOTICE
Remove only the amount of material necessary to
repair the seat surface.
5. To check contact area of the seat on the valve face,
apply a thin coating of Prussian Blue paste to the
valve seat. If using an interference angle (46°) apply
black permanent marker to the entire valve face
q
.
NOTICE
Valves with 100 hours or more will have noticeable
markings on the valve face. This is normal and should
not cause valve leakage. Both valves shown are
acceptable and would not require replacement.
6. Insert valve into guide and tap valve lightly into place
a few times.
7. Remove valve and check where the Prussian Blue
indicates seat contact on the valve face. The valve
seat should contact the middle of the valve face or
slightly above, and must be the proper width.
Intake Seat Cutter Diameter: 1.457″ (37.00 mm)
Exhaust Seat Cutter Diameter: 1.260″ (32.00 mm)
ENGINE / COOLING SYSTEM
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