Arctic Cat 1000 XT 2014 Service Manual page 50

Cleaning/Inspecting Piston
1. Take an old piston ring and snap it into two pieces;
then grind the end of the old ring to a 45° angle and to
a sharp edge.
2. Using the sharpened ring as a tool, clean carbon from
the ring-grooves. Be sure to position the ring with its
tapered side up.
CAUTION
Improper cleaning of the ring-grooves by the use of the
wrong type of ring-groove cleaner will result in severe
damage to the piston.
3. Using a non-metallic carbon removal tool, remove any
carbon buildup from the dome of the piston.
4. Inspect the piston for cracks in the piston pin, dome,
and skirt areas.
5. Inspect the piston for seizure marks or scuffing.
6. Inspect the perimeter of each piston for signs of exces-
sive "blowby." Excessive "blowby" indicates worn
piston rings or an out-of-round cylinder.
Measuring Piston-Ring End Gap
(Installed)
1. Place each compression ring in the wear portion of the
cylinder. Use the piston to position each ring squarely
in the cylinder.
2. Using a feeler gauge, measure each piston-ring end
gap. Acceptable ring end gap must not exceed speci-
fications.
Measuring Piston Pin (Outside
Diameter) and Piston-Pin Bore
1. Measure the piston pin outside diameter at each end
and in the center. If measurement exceeds specifica-
tions, the piston pin must be replaced.
48
2. Insert an inside dial indicator into the piston-pin bore.
The diameter must not exceed specifications. Take
two measurements to ensure accuracy.
Measuring Piston Skirt/Cylinder
Clearance
1. Measure the cylinder front to back in six places.
CC280D
2. Measure the corresponding piston diameter at a point
15 mm (0.6 in.) above the piston skirt at a right angle
to the piston-pin bore. Subtract this measurement
from the measurement in step 1. The difference
(clearance) must not exceed specifications.
Installing Piston Rings
1. Install the expander spring making sure the ends are
aligned on the wire; then install the oil ring with the
ring gap 90° from the spring gap and the marking "E
TOP" directed toward the top of the piston.
ATV-1070
ATV-1069
CC127D