Yamaha YP125R, Service Manual

Page: 301 / 498

CRANKSHAFT (YP125R)
5-56
EAS37P1055
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
ECA37P1007
Tap on one side of the crankcase with a soft-
face hammer. Tap only on the 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.
EAS37P1056
REMOVING THE CRANKSHAFT ASSEMBLY
1. Remove:
• Crankshaft assembly “1”
TIP
• Remove the crankshaft assembly with the
crankcase separating tool “2” and M6 bolts “3”.
• Make sure that the crankcase separating tool
is centered over the crankshaft assembly.
NOTICE
ECA37P1008
• To protect the end of the crankshaft, place
an appropriate sized socket “4” between
the crankcase separating tool bolt and the
crankshaft.
• Do not tap on the crankshaft.
EAS37P1057
CHECKING THE TIMING CHAIN AND TIMING
CHAIN GUIDE
1. Check:
• Timing chain
Damage/stiffness
→
Replace the timing
chain and camshaft sprocket as a set.
2. Check:
• Timing chain guide (intake side)
Damage/wear
→
Replace.
EAS37P1058
CHECKING THE CRANKSHAFT AND
CONNECTING ROD
1. Measure:
• Crankshaft runout
Out of specification
→
Replace the crank-
shaft.
TIP
Turn the crankshaft slowly.
1
Crankcase separating tool
90890-01135
Crankcase separator
YU-01135-B
1
4
2
3
3