Polaris TRAIL BOSS 325 2001 Manual page 83

VALVE SEAT RECONDITIONING, CONT.
1. Install pilot into valve guide.
2. Apply cutting oil to valve seat and cutter.
3. Place 46q cutter on the pilot and make a light cut.
4. Inspect the cut area of the seat.
SIf the contact area is less than 75% of the circum-
ference of the seat, rotate the pilot 180q and
make another light cut.
SIf 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.
SIf the contact area of the cutter is in the same
place, the valve guide is distorted from im-
proper installation and must be replaced. Be
sure the cylinder head is at the proper temper-
ature and replace the guide.
SIf 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 (46q)
apply black permanent marker to the entire valve
face (A).
6. Insert valve into guide and tap valve lightly into place
a few times.
ENGINE
(A)
3.27