Checking The Cylinders And Pistons - Yamaha FJR1300R Service Manual

CONNECTING RODS AND PISTONS
5 - 93
3. Remove:
• top ring
• 2nd ring
• oil ring
NOTE:
@
When removing a piston ring, open the end
gap with your fingers and lift the other side of
the ring over the piston crown.
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 M MMM M 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 "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
mum of D , D or D
2 4 6
b. If out of specification, replace the cylinder,
and the piston and piston rings as a set.
ENG
M MMM M M MMM M MMM
79.00 ~ 79.01 mm
(3.1102 ~ 3.1106 in)
0.05 mm (0.002 in)
0.05 mm (0.002 in)
~ D
1 6
or D – maximum of
1 2
, D or D – mini-
1 3 5