Installing Piston Rings; Measuring Piston Skirt; Cylinder Clearance; Cleaning/Inspecting Cylinder Head - Arctic Cat 450 XC 2011 Service Manual

2. Inspect and measure the connecting rod small end. If
the measurement exceeds specifications, the con-
necting rod must be replaced (see Center Crankcase
Components in this section).
3. Insert an inside dial indicator into the piston-pin
bore. Take two measurements to ensure accuracy.
The diameter must not exceed specifications. If the
diameter exceeds specifications, the piston must be
replaced.

Measuring Piston Skirt/

Cylinder Clearance

1. Measure the cylinder front to back in six places.
2. Measure the corresponding piston diameter at a point
8 mm (0.3 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 be within specifications.
34

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.
ATV-1070
2. Install the compression rings (1 and 2) so the letter(s) on
the top surface of each ring faces the dome of the piston.
Rotate the rings until the ring end gaps are on directly
opposite sides of the piston according to the illustration.
 NOTE: The chrome (silver) ring should be installed
in the top position.
ATV-1069
Incorrect installation of the piston rings will result in
engine damage.
CYLINDER/CYLINDER HEAD
ASSEMBLY
 NOTE: If the cylinder/cylinder head assembly can-
not be trued, they must be replaced.

Cleaning/Inspecting Cylinder Head

CC127D
The cylinder head studs must be removed for this pro-
cedure.
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.
Manual
Table of Contents
CAUTION
CAUTION
ATV-1085B
MD1343A