32
2. Using a feeler gauge, measure each piston-ring end
gap. Acceptable ring end gap must be within specifi-
cations.
CC995
Measuring Piston Pin, Connecting Rod
Small End, and Piston-Pin Bore
1. Measure the piston pin outside diameter at each end
and in the center. If measurement exceeds specifica-
tions, the piston pin must be replaced.
ATV-1070
2. Inspect and measure the connecting rod small end
inside diameter. If the measurement exceeds specifi-
cations, the connecting 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.
ATV-1069
Measuring Piston Skirt/Cylinder
Clearance
1. Measure the cylinder front to back in six places.
YT137
2. Measure the corresponding piston diameter at a point
15 mm 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.
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-1085B
2. Install the compression rings (1 and 2) so the letter
“T” 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.
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