3-15
3
Servicing Valves/Valve
Guides/Valve Seats
If valves, valve guides, or valve seats require servicing
or replacement, Arctic Cat recommends that the com-
ponents be taken to a qualified machine shop for ser-
vicing.
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.
Installing Valves
1. Apply grease to the inside surface of the valve
seals; then place a lower spring seat and valve
guide seal over each valve guide.
CC144D
2. Insert each valve into its original valve location.
3. Install the valve springs with the painted end of the
spring facing away from the cylinder head.
NOTE: If the paint is not visible, install the ends
of the springs with the closest wound coils toward
the head.
ATV-1011A
4. Place a spring retainer over the valve springs; then
using the valve spring compressor, compress the
valve springs and install the valve keepers.
CC994
PISTON ASSEMBLY
NOTE: Whenever a piston, rings, or pin are out of
tolerance, they must be replaced.
Cleaning/Inspecting Piston
1. Using a non-metallic carbon removal tool, remove
any carbon buildup from the top of the piston.
2. Inspect the piston for cracks in the piston pin,
boss, top, and skirt areas.
3. Inspect the piston for seizure marks or scuffing. If
piston is scored or galled, replace it with a new
one.
4. Inspect the perimeter of each piston for signs of
“blowby” indicated by dark discoloration.
“Blowby” is caused by worn piston rings, exces-
sive carbon in ring grooves, or an out-of-round
cylinder.
Removing Piston Rings
1. Starting with the top ring, slide one end of the ring
out of the ring-groove.
CAUTION
If valves are discolored or pitted or if the seating sur-
face is worn, the valve must be replaced. Do not
attempt to grind the valves or severe engine damage
may occur.
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