Checking The Crankcase; Checking The Bearings; Installing The Crankshaft - Yamaha YP250R 2005 Service Manual

CRANKSHAFT
5. Check:
• 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

1. Check:
• bearings
Clean and lubricate the bearings, and then
rotate the inner race with your finger.
Rough movement → Replace.
EAS00408

INSTALLING THE CRANKSHAFT

1. Lubricate:
• oil seals
• bearings
• oil pump drive gear
Recommended lubricant
Oil seal
Lithium-soap-based grease
Bearing, oil pump drive gear
Engine oil
2. Install:
• timing chain 1
NOTE:
Install the timing chain so it is not visible
through the opening a in the left crankcase
2.
5 - 68
ENG