Yamaha XT550J - Inspection and Repairing

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 PIN 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.