Polaris RANGER RZR 170 Service Manual page 73

• If the contact area of the cutter is in the same
place, the valve guide is distorted from improper
installation and must be replaced. Be sure the
cylinder head is at the proper temperature and
replace the guide.
• 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.
NOTE: Remove only the amount of material
necessary to repair the seat surface.
5. To check the 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
black marker to the entire valve face (A).
6. Insert valve into guide and tap valve lightly into place
a few times.
7. Remove valve and check where the Prussian Blue™
or black marker 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 (A).
Proper Seat Contact On Valve Face
• If the indicated seat contact is at the top edge of
the valve face and contacts the margin area(B) it is
too high on the valve face. Use the 30
lower the valve seat.
• If too low use the 60
seat. When contact area is centered on the valve
face, measure seat width.

)apply
(A)
(B)
(A)

cutter to
 
or 75 cutter to raise the
9923983 - 2012-2013 RZR 170 Service Manual
© Copyright 2012 Polaris Sales Inc.
• 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
and re-check contact point on the valve face and
seat width after each cut.
Seat 45
o o
Bottom 60 or 75
ENGINE

cutter
o
Top 30
o o
or 46
3.21
3