Inspection And Repairing; Cylinder Head Cover - Yamaha XT550J Service Manual

INSPECTION AND REPAIRING
A. Cylinder Head Cover
1. Remove two rocker shaft covers.
2. Insert a 6 mm screw into the rocker
shaft, and withdraw the rocker shaft. It
should slide out easily.
NOTE: _ _ _ _ _ _ _ _ _ _ _ _
If the rocker shaft does not slide out easily,
use the slide hammer (special tool
PIN. YU-
01083).
1. Bolt PI N YU-01083-1
2. Weight
PI N
YU-01083-3
3. Rocker arm and rocker shaft
a. The rocker arm usually wears at two
locations:
(1)
at the rocker shaft hole;
(2)
at the cam lobe contacting surface.
b. Measure the rocker shaft hole in the
rocker arm.
Standard size:
12.000 -12.018
mm
(0.472 -0.473
in)
3-12
c. The shaft has been hardened, and it
should not wear excessively. If a groove
has developed in this surface that can be
felt or if it shows a blue discoloration,
then the shaft should be replaced and
the lubrication system (pump and
passages) checked.
Standard shaft diameter:
11 .98 -11.99
mm
(0.4717 - 0.4720
in)
B. Cylinder Head
1.
Mount the valve spring compressor on
th~ head and depress each valve spring.
Remove the valve retainers with a
magnet or tweezers, and remove the
valve springs.