Checking The Rocker Arms And Rocker Arm Shafts - Yamaha YBR125ED 2005 Service Manual

ROCKER ARMS AND CAMSHAFT
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2. Measure:
• camshaft lobe dimensions a and b
Out of specification → Replace the cam-
shaft.
Camshaft lobe dimensions
Intake
a 25.881 ~ 25.981 mm
(1.0189 ~ 1.0229 in)
<Limit>: 25.851 mm (1.0178 in)
b 21.194 ~ 21.294 mm
(0.8344 ~ 0.8383 in)
<Limit>: 21.164 mm (0.8332 in)
Exhaust
a 25.841 ~ 25.941 mm
(1.0174 ~ 1.0213 in)
<Limit>: 25.811 mm (1.0162 in)
b 20.997 ~ 21.097 mm
(0.8267 ~ 0.8306 in)
<Limit>: 20.967 mm (0.8255 in)
3. Check:
• camshaft oil passage
Obstruction → Blow out with compressed
air.
EAS00206
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
Damage/wear → Replace.
2. Check:
• rocker arm shaft
Blue discoloration/excessive wear/pitting/
scratches → Replace or check the lubrica-
tion system.
ENG