Arctic Cat DVX 250 2007, Руководство по обслуживанию

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Measuring Piston Skirt/
Cylinder Clearance
1. Measure the cylinder front to back in six places.
CC397D
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 be within speci-
fications.
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 illustra-
tion.
„
NOTE: Note the direction of the exhaust side of
the piston (5) for correct ring end gap orientation.
ATV-1085B
2. Install the compression rings (1 and 2) so the let-
ter 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.
726-306A
CYLINDER ASSEMBLY
„
NOTE: If the cylinder cannot be trued, it must be
replaced.
Cleaning/Inspecting Cylinder
1. Wash the cylinder in parts-cleaning solvent.
2. Inspect the cylinder for pitting, scoring, scuff-
ing, warpage, and corrosion. If marks are found,
repair the surface using a cylinder hone (see
Honing Cylinder in this sub-section).
3. Place the cylinder on the surface plate covered
with #400 grit wet-or-dry sandpaper. Using light
pressure, move the cylinder in a figure eight
motion. Inspect the sealing surface for any indi-
cation of high spots. A high spot can be noted by
a bright metallic finish. Correct any high spots
before assembly by continuing to move the cyl-
inder in a figure eight motion until a uniform
bright metallic finish is attained.
Inspecting Cam Chain Guide
1. Inspect cam chain guide for cuts, tears, breaks,
or chips.
2. If the chain guide is damaged, it must be
replaced.
! CAUTION
Incorrect installation of the piston rings will result in
engine damage.
! CAUTION
Water or parts-cleaning solvent must be used in
conjunction with the wet-or-dry sandpaper or dam-
age to the sealing surface may result.
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