Arctic Cat 2013 Prowler XT Service Manual page 43

2. Measure the corresponding piston diameter at a point
15 mm 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 ring expander (4) in the bottom groove of the
piston; then install the thin oil rings (3) over the
expander making sure the expander ends do not
overlap. Stagger the end gaps of the upper and lower
thin oil rings according to the illustration.
 NOTE: Note the direction of the exhaust side of the
piston (5) for correct ring end gap orientation.
2. The ring with the orientation mark (MTOP or TOP)
should be installed in the second (middle) groove
and the ring with the orientation mark (M or O)
should be installed in the first (top) groove.
3-16
CC127D
Incorrect installation of the piston rings will result in
engine damage.
CYLINDER/CYLINDER HEAD
ASSEMBLY
 NOTE: If the cylinder/cylinder head cannot be trued,
they must be replaced as an assembly.
Cleaning/Inspecting Cylinder Head
The cylinder head studs must be removed for this procedure.
1. Using a non-metallic carbon removal tool, remove
any carbon buildup from the combustion chamber
being careful not to nick, scrape, or damage the com-
bustion chamber or the sealing surface.
2. Inspect the spark plug hole for any damaged threads.
Repair damaged threads using a "heli-coil" insert.
3. Place the cylinder head on the surface plate covered
with #400 grit wet-or-dry sandpaper. Using light pres-
sure, move the cylinder head in a figure eight motion.
Inspect the sealing surface for any indication of high
spots. A high spot can be noted by a bright metallic fin-
ATV-1085B
ish. Correct any high spots before assembly by continu-
ing to move the cylinder head in a figure eight motion
until a uniform bright metallic finish is attained.
Water or parts-cleaning solvent must be used in con-
junction with the wet-or-dry sandpaper or damage to
the sealing surface may result.
ATV-1024A
CAUTION
CAUTION
CAUTION
ATV-1024B
CC128D