Yamaha YZ250 Owner's Service Manual page 348

CRANKCASE AND CRANKSHAFT
4-66
EC4N3000
REMOVAL POINTS
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
front 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
screw or fitting. Do not force.
EC4N3302
Crankshaft
1. Remove:
9 Crankshaft 1
Use the crankcase separating tool 2.
Crankcase separating tool:
YU-1135-A/90890-01135
NOTE:
Make appropriate bolts 3 as shown available by
yourself and attach the tool with them.
cC
Do not use a hammer to drive out the
crankshaft.
ENG