Checking The Relief Valve; Checking The Crankcase; Checking The Bearings; Assembling The Crankcase - Yamaha 2004 YXR660 Service Manual

CRANKCASE

CHECKING THE RELIEF VALVE

1. Check:
• relief valve 1
• spring 2
Damage/wear → Replace the defective
part(s).

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.

CHECKING THE BEARINGS

1. Check:
• bearings
Clean and lubricate, then rotate the inner
race with a finger.
Roughness → Replace.

ASSEMBLING THE CRANKCASE

1. Apply:
• sealant (Quick Gasket
(to the mating surfaces of both case halves)
Sealant (Quick Gasket
P/N. ACC-11001-05-01
Yamaha bond No. 1215
P/N. 90890-85505
2. Install:
• dowel pins 2
4 - 71
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