Yamaha YZ450F(W), Owner'S Service Manual

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ENG
CRANKCASE AND CRANKSHAFT
Crankshaft
1. Remove:
• Crankshaft
1
Use the crankcase separating tool
2
.
NOTE:
Install the crankcase separating tool as shown.
CAUTION:
Do not use a hammer to drive out the
crankshaft.
Crankcase separating tool:
YU-A9642/90890-04152
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.