Polaris 850 PRO-RMK 155 2.6" QD 2021, Manual

Page: 276 / 747

3.76
9850060 R02 - 2020-2021 850 AXYS™ Long Track Snowmobile Service Manual
© Copyright Polaris Inc.
CYLINDER INSPECTION
Inspect cylinder for wear, scratches, or damage. If no damage is evident, measure the cylinder for taper and out of
round with a dial bore gauge. Measure the bore 0.78 in (20 mm) from the top of the cylinder; in line with the piston pin
(X) and 90° to the pin (Y) to determine if the bore is out of round. Repeat the measurements at a point just above the
exhaust port and at a point below the transfer port. Use the chart below and record all measurements.
CYLINDER MEASUREMENT WORKSHEET
q
TOP (Measured 0.78 in (20 mm) from top of cylinder)
X= Y=
w
MIDDLE (Measured above exhaust port)
X= Y=
e
BOTTOM (Measured below transfer port)
X= Y=
Out-of-Round = Top X - Top Y and Bottom Y - Bottom X
Taper = Top Y - Bottom Y and Top X - Bottom X
MEASUREMENT
Taper Limit:
0.002 in (0.051 mm)
MEASUREMENT
Out-of-Round Limit:
0.002 in (0.051 mm)
ENGINE / COOLING / EXHAUST