Yamaha YZ125 2009, Owner'S Service Manual

Page: 140 / 234

4-57
CRANKCASE AND CRANKSHAFT
REMOVING THE SEGMENT
1. Remove:
• Bolt (segment) "1"
• Segment "2"
Turn the segment counterclockwise until it
stops and loosen the bolt.
If the segment gets an impact, it may be
damaged. Take care not to give an impact to
the segment when removing the bolt.
DISASSEMBLING THE CRANKCASE
1. Remove:
• Crankcase (right) "1"
Use the flywheel puller "2".
• Make appropriate bolts "3" as shown avail-
able by yourself and attach the tool with them.
• 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.
• As pressure is applied, alternately tap on the
engine mounting boss and transmission
shafts.
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, re-
align, and start over. If the cases do not sep-
arate, check for a remaining case bolt or
fitting. Do not force.
REMOVING THE CRANKSHAFT
1. Remove:
• Crankshaft "1"
Use the crankcase separating tool "2".
Make appropriate bolts "3" as shown available
by yourself and attach the tool with them.
Do not use a hammer to drive out the crank-
shaft.
REMOVING THE CRANKCASE BEARING
1. Remove:
• Bearing "1"
• Remove the bearing from the crankcase by
pressing its inner race as shown in "A".
• If the bearing is removed together with the
crankshaft, remove the bearing using a gen-
eral bearing puller "2" as shown in "B".
• Do not use the removed bearing.
Flywheel puller:
YU-1362-A/90890-01362
Crankcase separating tool:
YU-1135-A/90890-01135