Checking The Crankshaft - Yamaha YBR125ED 2005 Service Manual

D
C
A
CRANKSHAFT
EAS00394

CHECKING THE CRANKSHAFT

1. Measure:
• crankshaft runout C
Out of specification → Replace the crank-
shaft, bearing or both.
NOTE:
_
Turn the crankshaft slowly.
C
2. Measure:
• big end side clearance D
Out of specification → Replace the crank-
shaft.
3. Measure:
• crankshaft width A
Out of specification → Replace the crank-
shaft.
4. Check:
• crankshaft sprocket
Damage/wear → Replace the crankshaft.
• bearing
Cracks/damage/wear → Replace the crank-
shaft.
5. Check:
• crankshaft journal
Scratches/wear → Replace the crankshaft.
• crankshaft journal oil passage
Obstruction → Blow out with compressed
air.
5 - 75
ENG
Maximum crankshaft runout
0.030 mm (0.0012 in)
Big end side clearance
0.150 ~ 0.450 mm
(0.0059 ~ 0.0177 in)
Crankshaft width
46.95 ~ 47.00 mm
(1.848 ~ 1.850 in)