Polaris 2012 RANGER RZR 570 INTL Service Manual page 99

NOTE: When us ing a n int erference a ngle, t he seat
contact point on the valve will be very narrow, and is
a normal condition. Look for an even and continuous
contact point all the way around the valve face (A).
Intake Seat Cutter Diameter: 1.567 in. (39.80 mm)
INTAKE
30°
45°
Seat Width
60° .039" (1.00 mm)
B
A
Proper Seat Contact
on Valve Face
9923523 - 2012 RANGER RZR 570 Service Manual
© Copyright 2011 Polaris Sales Inc.
ENGINE / COOLING SYSTEM
Exhaust Seat Cutter Diameter: 1.364 in. (34.65 mm)
EXHAUST
.059" (1.50 mm)
Valve Seat Width:
Intake: .0393" (1.00 mm)
Service Limit: .0551" (1.4 mm)
Exhaust: .0590" (1.50 mm)
Service Limit: .0758" (1.9 mm)
8. Clean all filings from the area with hot s oapy water.
Rinse and dry with compressed air.
9. Lubricate valve guides with clean engine oil and apply
oil or water based lapping compound to the face of the
valve.
NOTE: Lapping is no t req uired if an
angle reconditioning method is used.
10. Insert the valve into its respective guide and lap using
a lapping tool or a section of fuel line connected to the
valve stem.
11. Rotate the valve rapidly back and forth until the cut
sounds smooth. Lift the valve slightly off of the seat,
rotate 1/4 turn, and repeat the lapping process. Do this
four to f ive times until t he valve is fully seated, and
repeat process for the other valves.
12. Thoroughly clean cylinder head and valves.
30°
45°
Seat Width
60°
= In. / mm.
interference
3.47
3