Arctic Cat 660 cc Service Manual page 45

Piston Ring/Groove Clearance
1. Using a thickness gauge, measure the side
clearances of the 1st and 2nd rings.
2. If any of the clearances exceeds the specification
limit, replace both piston and piston rings.
Measuring Piston Pin Bore Diameter
1. Insert an inside dial indicator into the piston-pin
bore. Take two measurements to ensure accuracy.
2. Piston pin bore must be within specifications.
Measuring Piston Skirt/
Cylinder Clearance
1. Measure the cylinder front to back in six places
using a cylinder bore gauge. The amount of wear
is the difference between the largest and smallest
readings. If the determined wear exceeds the limit
indicated, bore to the next oversize by using a
boring machine or replace the cylinder.
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2. Measure the corresponding piston diameter at a
point 14 mm (0.551 in.) above the piston skirt at a
right angle to the piston-pin bore. Piston diameter
must be within specifications.
3. Piston skirt to cylinder clearance must be within
specifications.
4. If the piston/cylinder clearance exceeds the limit,
bore the cylinder and use an oversized piston or
replace both cylinder and piston.
Installing Piston Rings
1. Install the rings in the appropriate grooves.
Stagger the gaps of the rings.
! CAUTION
Incorrect installation of the piston rings will
result in engine damage.
Measuring Piston Pin Diameter
1. Measure the piston pin diameter at each end and in
the center. If measurement is less than minimum
specifications, the piston pin must be replaced.
2. Piston pin diameter must be within specifications.
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