Yamaha YZ250(W)/W1 Owner's Service Manual page 350

CRANKCASE AND CRANKSHAFT
4-66
EC4N3000
REMOVAL POINTS
Segment
1. Remove:
9 Bolt (segment) 1
9 Segment 2
NOTE:
Turn the segment counterclockwise until it stops
and loosen the bolt.
cC
If the segment gets an impact, it may be
damaged. Take care not to give an impact
to the segment when removing the bolt.
EC4N3212
Crankcase
1. Remove:
9 Crankcase (right) 1
Use the crankcase separating tool 2.
Crankcase separating tool:
YU-1135-A/90890-01135
NOTE:
9 Make appropriate bolts 3 as shown available
by yourself and attach the tool with them.
9 Fully tighten the tool holding bolts, but make
sure the tool body is parallel with the case. If
necessary, one screw may be backed out
slightly to level tool body.
9 As pressure is applied, alternately tap on the
engine mounting boss and transmission shafts.
cC
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 bolt
or fitting. Do not force.
ENG