Checking The Rocker Arms And Rocker Arm Shafts - Yamaha XG250 Service Manual

4. Check:
Camshaft oil passage
●
Obstruction → Blow out with compressed air.
EAS23880
CHECKING THE ROCKER ARMS AND
ROCKER ARM SHAFTS
The following procedure applies to all of the
rocker arms and rocker arm shafts.
1. Check:
Rocker arm "1"
●
Valve clearance adjusting screws "2"
●
Damage/wear → Replace.
ROCKER ARM, CAMSHAFT
2
2. Check:
Rocker arm shaft
●
Blue discoloration/excessive wear/pitting/
scratches → Replace or check the lubrica-
tion system.
3. Measure:
Rocker arm inside diameter "a"
●
Out of specification → Replace.
Rocker arm inside diameter
12.000–12.018 mm (0.4724–0.4731
in)
Limit
12.036 mm (0.4739 in)
a
4. Measure:
Rocker arm shaft outside diameter "a"
●
Out of specification → Replace.
Rocker arm shaft outside diameter
11.981–11.991 mm (0.4717–0.4721
in)
Limit
11.950 mm (0.4705 in)
5-14
1
2