Checking The Piston Rings - Yamaha XVS1300A 2007 Service Manual

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b. If out of specification, rebore or replace the
cylinder, and replace the piston and piston
rings as a set.
c. Measure the piston skirt diameter "D" "a" with
the micrometer.
Piston
Diameter D
99.955–99.970 mm (3.9352–
3.9358 in)
b. 8 mm (0.31 in) from the bottom edge of the
piston
d. If out of specification, replace the piston and
piston rings as a set.
e. Calculate the piston-to-cylinder clearance
with the following formula.
• Piston-to-cylinder clearance =
Cylinder bore "C" -
Piston skirt diameter "P"
Piston-to-cylinder clearance
0.030–0.055 mm (0.0012–0.0022
in)
Limit
0.15 mm (0.0059 in)
f. If out of specification, rebore or replace the
cylinder, and replace the piston and piston
rings as a set.
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email: info@motomatrix.co.uk
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CYLINDERS AND PISTONS
EAS24430

CHECKING THE PISTON RINGS

The following procedure applies to all of the pis-
ton rings.
1. Measure:
• Piston ring side clearance
Out of specification → Replace the piston
and piston rings as a set.
NOTE:
Before measuring the piston ring side clearance,
eliminate any carbon deposits from the piston
ring grooves and piston rings.
Piston ring
Top ring
Ring side clearance
0.030–0.080 mm (0.0012–
0.0032 in)
Limit
0.130 mm (0.0051 in)
2nd ring
Ring side clearance
0.030–0.070 mm (0.0012–
0.0028 in)
Limit
0.130 mm (0.0051 in)
2. Install:
• Piston ring
(into the cylinder)
NOTE:
Level the piston ring in the cylinder with the pis-
ton crown.
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