Checking The Bearings And Oil Seals; Checking The Crankcase; Installing The Bearings - Yamaha YFM50S Service Manual

2
a
1
EBS00339
CHECKING THE BEARINGS AND OIL
SEALS
1. Check:
• bearings
Clean and lubricate, then rotate the inner
race with a finger.
Roughness → Replace.
2. Check:
• oil seals
Damage/wear → Replace.
EBS00338

CHECKING THE CRANKCASE

1. Thoroughly wash the case halves in a mild
solvent.
2. Clean all the gasket mating surfaces and
crankcase mating surfaces thoroughly.
3. Check:
• crankcase
Cracks/damage → Replace.
• oil delivery passages
Clogged → Blow out with compressed air.

INSTALLING THE BEARINGS

b
1. Install:
• left main axle bearing 1
NOTE:
Press the left main axle bearing into the left
crankcase 2, as shown in the illustration.
a 34.0 ~ 34.5 mm (1.34 ~ 1.36 in)
b Crankcase mating surface
4 - 52
ENG
CRANKCASE