CRANKSHAFT (YP125R)
5-57
2. Measure:
• Big end side clearance
Out of specification → Replace the crank-
shaft.
3. Measure:
• Crankshaft width
Out of specification → Replace the crank-
shaft.
4. Check:
• Crankshaft sprocket “1”
Damage/wear → Replace the crankshaft.
• Bearing “2”
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.
EAS37P1059
CHECKING THE CRANKCASE
1. Thoroughly wash the crankcase halves in a
mild solvent.
2. Thoroughly clean all the gasket surfaces and
crankcase mating surfaces.
3. Check:
• Crankcase
Cracks/damage → Replace.
• Oil delivery passages
Obstruction → Blow out with compressed air.
EAS37P1060
CHECKING THE BEARING AND OIL SEAL
1. Check:
• Bearing
Clean and lubricate the bearings, and then
rotate the inner race with your finger.
Rough movement → Replace.
EAS37P1061
CHECKING THE OIL PUMP DRIVE GEAR
1. Check:
• Oil pump drive gear
Damage/wear → Replace.
Runout limit C
0.030 mm (0.0012 in)
Big end side clearance D
0.150–0.450 mm (0.0059–0.0177
in)
Width A
45.95–46.00 mm (1.809–1.811 in)
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