Removing The Cylinders And Pistons; Checking The Cylinders And Pistons - Yamaha FZS600'98 Service Manual

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CYLINDER AND PISTON
EB404101

REMOVING THE CYLINDERS AND PISTONS

The following procedure applies to all of the cyl-
inders and pistons.
1
1. Remove:
S piston pin clip 1
S piston pin 2
S piston 3
CAUTION:
Do not use a hammer to drive the piston
pin out.
NOTE:
S Before removing the piston pin clip, cover
the crankcase opening with a clean rag to
prevent the piston pin clip from falling into
the crankcase.
S For reference during installation, put an
identification mark on each piston crown.
S Before removing the piston pin, deburr the
piston pin clip's groove and the piston's pin
bore area. If both areas are deburred and
the piston pin is still difficult to remove, re-
move it with the piston pin puller 4 .
2. Remove:
S top ring
S 2nd ring
S 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.
EB404405

CHECKING THE CYLINDERS AND PISTONS

The following procedure applies to all of the cyl-
inders and pistons.
1. Check:
S piston wall
S cylinder wall
Vertical scratches ! Rebore or replace
the cylinder, and replace the piston and
piston rings as a set.
2. Measure:
S piston-to-cylinder clearance
a. Measure cylinder bore "C" with the cylin-
der bore gauge.
20 mm from the top of the cylinder
1
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.
4-26
ENG
Piston pin puller
90890-01304