Checking The Crankcase; Checking The Bearings And Oil Seals - Yamaha MIO Service Manual

CRANKSHAFT
4. Check:
• crankshaft drive sprocket 1
Damage/wear → Replace the crankshaft.
• bearings 2
Cracks/damage/wear → Replace the crank-
shaft.
• oil pump drive gear 3
Damage/wear → Replace the crankshaft.
5. Check:
• crankshaft journal
Scratches/wear → Replace the crankshaft.
• crankshaft journal oil passage
Obstruction → Blow out with compressed
air.
EAS00399

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.
EAS00401
CHECKING THE BEARINGS AND OIL
SEALS
1. Check:
• bearings
Clean and lubricate the bearings, then
rotate the inner race with your finger.
Rough movement → Replace.
2. Check:
• oil seals
Damage/wear → Replace.
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