Checking The Cylinder And Piston; Checking The Piston Rings - Yamaha 2009 Diversion XJ6S Service Manual

EAS24390

CHECKING THE CYLINDER AND PISTON

1. Check:
Piston wall
G
Cylinder wall
G
Vertical scratches → Replace the cylinder,
and replace the piston and piston rings as a
set.
2. Measure:
Piston-to-cylinder clearance
G
MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM
a. Measure cylinder bore "C" with the cylinder
bore gauge.
TIP
Measure cylinder bore "C" by taking side-to-side
and front-to-back measurements of the cylinder.
Then, find the average of the measurements.
Bore
65.500–65.510 mm
(2.5787–2.5791 in)
Wear limit
65.56 mm (2.5811 in)
Taper limit
0.050 mm (0.0020 in)
Out of round limit
0.050 mm (0.0020 in)
"C" = maximum of D –D
1
"T" = maximum of D or D
1
"R" = maximum of D , D
1
D
6
b. If out of specification, replace the cylinder,
and replace the piston and piston rings as a
set.
c. Measure piston skirt diameter "P" with the mi-
crometer.
Piston size "P"
Standard
65.475–65.490 mm
(2.5778–2.5783 in)
6
– maximum of D or D
2 5
or D – minimum of D , D
3 5 2
a. 5 mm (0.20 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"
f. If out of specification, replace the cylinder,
and the piston and piston rings as a set.
LLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLL
6
EAS24430
or
4

CHECKING THE PISTON RINGS

1. Measure:
Piston ring side clearance
G
Out of specification → Replace the piston
and piston rings as a set.
TIP
Before measuring the piston ring side clearance,
eliminate any carbon deposits from the piston
ring grooves and piston rings.
5-67
CRANKSHAFT
Piston-to-cylinder clearance
0.010–0.035 mm
(0.0004–0.0014 in)