Yamaha YZ450F(V) Owner's Service Manual page 420

CRANKCASE AND CRANKSHAFT
4 - 90
Crankshaft
1. Remove:
• Crankshaft 1
Use the crankcase separating tool 2.
Crankcase separating tool:
YU-A9642/90890-04152
NOTE:
Install the crankcase separating tool as shown.
CAUTION:
Do not use a hammer to drive out the
crankshaft.
Crankshaft bearing
1. Remove:
• Bearing 1
NOTE:
• Remove the bearing from the crankcase by
pressing its inner race.
• Do not use the removed bearing.
INSPECTION
Timing chain and timing chain guide
1. Inspect:
• Timing chain
Cracks/stiff → Replace the timing chain
and camshaft sprocket as a set.
2. Inspect:
• Timing chain guide
Wear/damage → Replace.
EC4N4101
Crankcase
1. Inspect:
• Contacting surface a
Scratches → Replace.
• Engine mounting boss b, crankcase
Cracks/damage → Replace.
ENG