Checking The Primary Driven Gear; Installing The Oil Seal; Installing The Right Crankcase Cover - Yamaha YZ250F(E) Owner's Service Manual

CHECKING THE PRIMARY DRIVEN GEAR

1. Check:
• Primary driven gear
Damage/wear  Replace the primary drive
and primary driven gears as a set.
Excessive noise during operation  Re-
place the primary drive and primary driven
gears as a set.

INSTALLING THE OIL SEAL

EAS1SM1244
1. Install:
• Oil seal "1"
New
• Washer "2"
• Circlip "3"
New
TIP
• Apply is lithium-soap-based grease on the oil
seal lip.
• Install the oil seal in parallel with its manufac-
ture's marks or numbers facing inward.
LS
INSTALLING THE RIGHT CRANKCASE
EAS1SM1245
COVER
1. Install:
• Dowel pin "1"
• O-rings "2"
New
• Collar "3"
• Gasket "4"
New
TIP
Apply the lithium-soap-based grease on the O-
ring.
1
3
2
1
4
New
LS
2
New
3
1
2. Install:
• Right crankcase cover "1"
• Right crankcase cover bolt "2"
Right crankcase cover bolt
10 Nm (1.0 m·kgf, 7.2 ft·lbf)
TIP
• Apply the engine oil on the impeller shaft end.
• Mesh the impeller shaft gear "3" with primary
drive gear "4".
• Tighten the right crankcase cover bolts in
stages and in a crisscross pattern.
1
EAS1SM1246
5-40
CLUTCH
4
E
3
2
1