Removing The Crankshaft; Checking The Crankshaft; Installing The Crankshaft - Yamaha YZF-R125 Service Manual

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EAS5D71016

REMOVING THE CRANKSHAFT

1. Remove:
• Crankshaft "1"
NOTE:
• Remove the crankshaft with the crankcase
separating tool "2".
• Make sure the crankcase separating tool is
centered over the crankshaft.
ECA5D71022
CAUTION:
• To protect the end of the crankshaft, place
an appropriate sized socket between the
crankcase separating tool bolt and the
crankshaft.
• Do not tap on the crankshaft.
Crankcase separating tool
90890-01135
Crankcase separator
YU-01135-B
1
EAS5D71035

CHECKING THE CRANKSHAFT

1. Measure:
• Crankshaft runout
Out of specification → Replace the crank-
shaft, bearing or both.
NOTE:
Turn the crankshaft slowly.
Runout limit C
0.030 mm (0.0012 in)
2. Measure:
3. Measure:
2
4. Check:
5. Check:
EAS5D71036

INSTALLING THE CRANKSHAFT

1. Install:
NOTE:
Install the crankshaft with the crankshaft installer
pot "2", crankshaft installer bolt "3", adapter
(M12) "4" and spacer (crankshaft installer) "5".
5-62
• Big end side clearance
Out of specification → Replace the crank-
shaft.
Big end side clearance D
0.110–0.410 mm (0.0043–0.0161
in)
• Crankshaft width
Out of specification → Replace the crank-
shaft.
Width A
47.95–48.00 mm (1.888–1.890 in)
• Crankshaft sprocket
Damage/wear → Replace the crankshaft.
• Bearing
Cracks/damage/wear → Replace the crank-
shaft.
• Crankshaft journal
Scratches/wear → Replace the crankshaft.
• Crankshaft journal oil passage
Obstruction → Blow out with compressed air.
• Crankshaft "1"
CRANKSHAFT