Aeon COBRA 50 2007, Руководство по обслуживанию

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ENGINE / TRANSMISSION
CYLINDER INSPECTION
Maximum cylinder wear occurs at the very top of
top ring travel. Minimum wear occurs below ring
travel. Failure to measure the cylinder at these point
may result in a faulty decision regarding the
suitability of the cylinder for continued use.
Using an inside micrometer or dial bore gauge.
Check cylinder bore for out of round and taper.
Proceed as follows:
1. At the top of the piston ring travel zone measuring
the cylinder diameter at two locations. Record
values for measurement parallel and perpendicular
to the crankshaft.
2. Repeat the two measurements at the center of the
piston ring travel.
3. Repeat the measurement again at the bottom of
the bore at a point below the piston ring travel zone.
5. Rebore the cylinder if out-of-round more than
0.05mm and taper more than 0.05 mm.
Cylinder Taper
Limit: .05 mm.(002”) Max.
Cylinder Out of Round
Limit: .05 mm.(002”) Max.
Cylinder Honing Procedure
A hone which will straighten as well as remove material
from the cylinder is very important. Using a common
spring loaded glaze breaker for honing is not advised.
Polaris recommends using a rigid hone or arbor honing
machine.
Cylinders may be wet or dry honed depending upon the hone
manufacturer’s recommendations. Wet honing removes more
material faster and leaves a more distinct pattern in the bore.
Honing To Deglaze
A finished cylinder should have a cross-hatch pattern to ensure
piston ring seating and to aid in the retention of the fuel/oil
mixture during initial break in. Hone cylinder according to
hone manufacturer’s instructions, or these guidelines:
• Use a motor speed of approximately 300-500 RPM, run the
hone in and out of the cylinder rapidly until cutting tension
decreases. Remember to keep the hone drive haft centered (or
cylinder centered on arbor) and to bring the stones
approximately 1/2” (1.3 cm) above and below the bore at the
end of each stroke.
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