Yamaha YXR660FAS Service Manual download pdf (Page 164)

4 - 34

ENG

CYLINDER AND PISTON

REMOVING THE PISTON

1. Remove:

• piston pin clips 1

• piston pin 2

• piston 3

NOTE:

Before removing piston pin, deburr the clip

groove and pin hole area. If the piston pin

groove is deburred and the piston pin is still

difficult to remove, use the piston pin puller 4.

CAUTION:

Do not use a hammer to drive the piston

pin out.

2. Remove:

• piston rings

NOTE:

Spread the end gaps apart while at the same

time lifting the piston ring over the top of the

piston crown.

Piston pin puller

P/N. YU-01304, 90890-01304

CHECKING THE CYLINDER AND PISTON

1. Check:

• cylinder and piston walls

Vertical scratches → Rebore or replace the

cylinder and the piston.

2. Measure:

• piston-to-cylinder clearance

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1st step:

a. Measure the cylinder bore “C” with a cylin-

der bore gauge 1.

a

50 mm (2.0 in) from the top of the cylinder

NOTE:

Measure cylinder bore “C” in parallel to and at

right angles to the cylinder matching surface.

Then, find the average of the measurements.

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