Yamaha YZ450F, Owner'S Service Manual

Page: 418 / 650

4 - 89
ENG
CRANKCASE AND CRANKSHAFT
REMOVAL POINTS
Crankcase
1. Separate:
• Crankcase (right)
• Crankcase (left)
Separation steps:
• Remove the crankcase bolts, hose guide
and clutch cable holder.
NOTE:
Loosen each bolt 1/4 of a turn at a time and
after all the bolts are loosened, remove
them.
• Remove the crankcase (right).
NOTE:
• Place the crankcase with its left side
downward and split it by inserting a screw-
driver tip into the splitting slit
a
in the
crankcase.
• Lift the crankcase (right) horizontally while
lightly patting the case splitting slit and
engine mounting boss using a soft ham-
mer, and leave the crankshaft and trans-
mission with the crankcase (left).
CAUTION:
Use soft hammer to tap on the case half.
Tap only on reinforced portions of case.
Do not tap on gasket mating surface.
Work slowly and carefully. Make sure the
case halves separate evenly. If one end
“hangs up”, take pressure off the push
screw, realign, and start over. If the
cases do not separate, check for a
remaining case screw or fitting. Do not
force.
• Remove the dowel pins and O-ring.
a
Balancer shaft
1. Remove:
• Balancer shaft
1
NOTE:
Remove the balancer shaft with its flat side
a
facing the crankshaft.