Yamaha MBK MW125 2014, Service Manual

Page: 267 / 380

CRANKSHAFT
5-64
EAS31241
DISASSEMBLING THE CRANKCASE
1. Remove:
• Crankcase bolts
TIP
Loosen each bolt 1/4 of a turn at a time, in stag-
es and in a crisscross pattern. After all of the
bolts are fully loosened, remove them.
2. Remove:
• Left crankcase “1”
NOTICE
ECA13900
Tap on one side of the crankcase with a soft-
face hammer. Tap only on reinforced por-
tions of the crankcase, not on the crankcase
mating surfaces. Work slowly and carefully
and make sure the crankcase halves sepa-
rate evenly.
EAS30414
REMOVING THE CRANKSHAFT ASSEMBLY
1. Remove:
• Crankshaft assembly “1”
TIP
• Remove the crankshaft assembly with the
crankcase separating tool “2”.
• Make sure that the crankcase separating tool
is centered over the crankshaft assembly.
NOTICE
ECA20630
• To protect the end of the crankshaft, place
an appropriate sized socket between the
crankcase separating tool bolt and the
crankshaft.
• Do not tap on the crankshaft.
EAS31242
CHECKING THE CRANKSHAFT ASSEMBLY
1. Measure:
• Crankshaft runout
Out of specification
→
Replace the crank-
shaft assembly.
TIP
Turn the crankshaft slowly.
2. Measure:
• Big end side clearance
Out of specification
→
Replace the crank-
shaft assembly.
1
Crankcase separating tool
90890-01135
Crankcase separator
YU-01135-B
Runout limit
0.030 mm (0.0012 in)
Big end side clearance
0.110–0.410 mm (0.0043–0.0161
in)
1
2