Yamaha TT-R90(V) Owner's Service Manual page 222

CAMSHAFT AND ROCKER ARMS
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REMOVAL POINTS
Rocker arm shaft
1. Remove:
• Rocker arm shafts
NOTE:
Use a slide hammer bolt 1 and weight 2 to
slide out the rocker arm shafts.
Slide hammer set:
YU-1083-A
Slide hammer bolt:
90890-01085
Weight:
90890-01084
INSPECTION
Camshaft
1. Measure:
• Cam lobes length a and b
Out of specification → Replace.
Cam lobes length limit:
Intake:
a 25.398 mm (0.9999 in)
b 21.004 mm (0.8269 in)
Exhaust:
a 25.256 mm (0.9943 in)
b 21.017 mm (0.8274 in)
ASSEMBLY AND INSTALLATION
1. Apply:
• Molybdenum disulfide oil
(onto the camshaft cam lobe)
• Engine oil
(onto the camshaft bearing)
2. Install:
• Camshaft 1
ENG