3.48
9850045 R01 - 2020-2021 RANGER 1000 Service Manual
© Copyright Polaris Inc.
• 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° or 75° cutter to raise the
seat. When contact area is centered on the valve
face, measure seat width.
• If the seat is too wide or uneven, use both top
and bottom cutters to narrow the seat.
• 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.
ITEM
ANGLE
y
30.0° ± 1.5°
u
45.0° ± 0.5°
i
60.0° ± 1.5°
NOTICE
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 on the black marker, all the way around the valve
face.
MEASUREMENT
Valve Seat Width:
Intake:
0.0591 ± 0.0039" (1.5 ± 0.10 mm)
Service Limit:
0.0748" (1.9 mm)
Exhaust:
0.0787 ± 0.0039“ (2.0 ± 0.10 mm)
Service Limit:
0.0945" (2.4 mm)
8. Clean all filings from the area with hot soapy 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.
NOTICE
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.
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 five times until the valve is fully seated,
and repeat process for the other valve(s).
12.Thoroughly clean cylinder head and valves.
ENGINE / COOLING / EXHAUST
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