Checking The Cylinders And Pistons - Yamaha XV1700PCRC Service Manual

CYLINDERS AND PISTONS
EAS00258
CHECKING THE CYLINDERS AND
PISTONS
The following procedure applies to all of the
cylinders and pistons.
1. Check:
• piston wall
• cylinder wall
Vertical scratches → Replace the cylinder,
and the piston and piston rings as a set.
2. Measure:
• piston-to-cylinder clearance
M MMM M MMM M
a. Measure cylinder bore "C" with the cylinder
bore gauge.
NOTE:
_
Measure cylinder bore "C" by taking side-to-
side and front-to-back measurements of the
cylinder. Then, find the average of the mea-
surements.
Cylinder bore gauge
(50 ~ 100 mm)
Cylinder bore "C"
Taper limit "T"
Out of round "R"
"C" = maximum of D
"T" = maximum of D
D or D
5 6
"R" = maximum of D
of D , D
2 4
b. If out of specification, replace the cylinder,
and the piston and piston rings as a set.
c. Measure piston skirt diameter "P" with the
micrometer.
Micrometer (75 ~ 100 mm)
a 5 mm (0.20 in) from the bottom edge of the pis-
ton
5 - 51
ENG
M MMM M M MMM M M MMM M
YU-03017
97.000 ~ 97.010 mm
(3.8189 ~ 3.8193 in)
0.05 mm (0.0016 in)
0.05 mm (0.0016 in)
~ D
1 6
or D - maximum of
1 2
, D or D - minimum
1 3 5
or D
6
YU-03009
M MMM M MMM