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Removing The Rocker Arms And Camshaft; Checking The Camshaft - Yamaha RAPTOR YFM125RA Service Manual

2011
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EAS23770
REMOVING THE ROCKER ARMS AND
CAMSHAFT
1. Loosen:
• Locknuts "1"
• Valve clearance adjusting screws "2"
2. Remove:
• Camshaft retainer "1"
3. Remove:
• Camshaft "1"
TIP
Screw 8 mm (0.31 in) bolt "2" into the threaded
end of the camshaft and then pull out the cam-
shaft.
4. Remove:
• Intake rocker arm shaft
• Intake rocker arm
• Exhaust rocker arm shaft
• Exhaust rocker arm
TIP
Remove the rocker arm shafts with the slide
hammer bolt "1" and weight "2".
Slide hammer bolt
90890-01083
Slide hammer bolt 6 mm
YU-01083-1
Weight
90890-01084
YU-01083-3
EAS23840

CHECKING THE CAMSHAFT

1. Check:
• Camshaft bushings
Damage/wear → Replace.
2. Check:
• Camshaft lobes
Blue discoloration/pitting/scratches →
Replace the camshaft.
3. Measure:
• Camshaft lobe dimensions "a" and "b"
Out of specification → Replace the cam-
shaft.
5-14
CAMSHAFT

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