Page 272 - Manual Oficina Polaris Sportsman 570 2014 a 2016

ENGINE / COOLING SYSTEM

7. Remove valve and check where the Prussian Blue Intake Seat Cutter Diameter:
indicates seat contact on the valve face. The valve 1.567 in. (39.80 mm)
seat should contact the middle of the valve face or
slightly above, and must be the proper width.
NOTE
When using an interference angle, the 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 e.

Exhaust Seat Cutter Diameter:
1.364 in. (34.65 mm)

MEASUREMENT
Valve Seat Width:
Intake:
Std.: .0393" (1.00 mm)
Service Limit: .0551" (1.4 mm)
Exhaust:
Std.: .0590” (1.50 mm)
Service Limit: .0758" (1.9 mm)

* If the indicated seat contact is at the top edge of the
valve face and contacts the margin area w it is too
high on the valve face. Use the 30° cutter to lower
the valve seat.
* If too low, use the 60° cutter to raise the seat. When 8. Clean all filings from the area with hot soapy water.
contact area is centered on the valve face, measure Rinse and dry with compressed air.
seat width. 9. Lubricate valve guides with clean engine oil and
* If the seat is too wide or uneven, use both top and apply oil or water based lapping compound to the
bottom cutters to narrow the seat. face of the valve.
* If the seat is too narrow, widen using the 45° cutter
and re-check contact point on the valve face and NOTE
seat width after each cut. Lapping is not required if an interference 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.

3.150 9926803 R06 - 2014-2016 Sportsman 325 / ETX / 450 HO / 570 Service Manual
© Copyright Polaris Industries Inc.