Arctic Cat 650 Twin2004 Service Manual page 49

Valve Seat/Guide Servicing Flow
Chart
Grinding Valve Seats

NOTE: If the valve seat is beyond servicing, the
cylinder head must be replaced.
1. Insert an exhaust valve seat pilot shaft into an
exhaust valve guide. Slide an exhaust valve seat
grinding tool onto the pilot shaft; then using light
pressure on a driver handle and a deep socket,
grind the exhaust valve seat until within
specifications.

NOTE: Repeat procedure on the remaining
exhaust valve.
3-20
2. Insert an intake valve seat pilot shaft into one of
the intake valve guides. Slide the intake valve seat
grinding tool onto the pilot shaft; then using light
pressure on a driver handle and a deep socket,
grind the
specifications.

NOTE: Repeat procedure on the remaining
intake valve.
Lapping Valves

NOTE: Do not grind the valves. If a valve is dam-
aged, it must be replaced.
1. Remove all carbon from the valves.
ATV-0107
2. Lubricate each valve stem with light oil; then
apply a small amount of valve lapping compound
to the entire seating face of each valve.
3. Attach the suction cup of a valve lapping tool to
the head of the valve.
4. Rotate the valve until the valve and seat are evenly
polished.
5. Clean all compound residue from the valve and
seat.
Measuring Rocker Arm
(Inside Diameter)
1. Using a dial calipers, measure the inside diameter
of the rocker arm.
2. Acceptable inside diameter range must be within
specifications.
Measuring Rocker Arm Shaft
(Outside Diameter)
1. Using a micrometer, measure the outside diameter
of the rocker arm shaft.
2. Acceptable outside diameter range must be within
specifications.
CC139D
intake valve seat until within
CC140D