Yamaha YXR660FAS Service Manual download pdf (Page 145)

4 - 15

ENG

ROCKER ARMS

REMOVING THE ROCKER ARMS

1. Remove:

• rocker arm shafts 1

• rocker arms 2

NOTE:

Use a slide hammer bolt 3 and weight 4 to

remove the rocker arm shafts.

Slide hammer set

P/N. YU-01083-A

Slide hammer bolt (M6)

P/N. 90890-01083

Weight

P/N. 90890-01084

CHECKING THE ROCKER ARMS

1. Check:

• rocker arm lobes 1

• valve adjusters 2

Blue discoloration/pitting/scratches →

Replace.

2. Check:

• rocker arms

• rocker arm shafts

Damage/wear → Replace.

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a. Check the two contact areas on the rocker

arms for signs of abnormal wear.

1) Rocker arm shaft hole

2) Camshaft lobe contact surface

Excessive wear → Replace.

b. Check the surface of the rocker arm shafts.

Blue discoloration/pitting/scratches →

Replace/check lubrication.

c. Measure the inside diameter a of the

rocker arm holes.

Out of specification → Replace.

Rocker arm inside diameter

12.000 ~ 12.018 mm

(0.4724 ~ 0.4731 in)

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