Removing The Connecting Rods And Pistons; Checking The Cylinder And Piston - Yamaha 2014 MT-07 Service Manual

EAS30745
REMOVING THE CONNECTING RODS AND
PISTONS
The following procedure applies to all of the con-
necting rods and pistons.
1. Remove:
• Connecting rod cap "1"
• Connecting rod
• Big end bearings
TIP
• Identify the position of each connecting rod cap
so that it can be reinstalled in its original place.
• After removing the connecting rods and con-
necting rod caps, care should be taken not to
damage the mating surfaces of the connecting
rods and connecting rod caps.
2. Remove:
• Piston pin clips "1"
• Piston pin "2"
• Piston "3"
• Connecting rod "4"
ECA13810
NOTICE
Do not use a hammer to drive the piston pin
out.
TIP
• For reference during installation, put identifica-
tion marks on the piston crown.
• Before removing the piston pin, deburr the pis-
ton pin clip groove and the piston pin bore ar-
ea. If both areas are debarred and the piston
pin is still difficult to remove, remove it with the
piston pin puller set "5".
Piston pin puller set
90890-01304
Piston pin puller
YU-01304
CONNECTING RODS AND PISTONS
1
5-77
1
2
3. Remove:
• Top ring
• 2nd ring
• Oil ring
TIP
When removing a piston ring, open the end gap
with your fingers and lift the other side of the ring
over the piston crown.
EAS30747

CHECKING THE CYLINDER AND PISTON

The following procedure applies to all of the cyl-
inders and pistons.
1. Check:
• Piston wall
• Cylinder wall
Vertical scratches → Replace the cylinder,
and replace the piston and piston rings as a
set.
2. Measure:
• Piston-to-cylinder clearance
4
3
5