Removing The Crankshaft; Checking The Crankshaft; Installing The Crankshaft - Yamaha YZ250 2022 Owner's Service Manual

EAM30491

REMOVING THE CRANKSHAFT

1. Remove:
• Crankshaft "1"
(with the crankcase separating tool "2")
Crankcase separating tool
90890-01135
Crankcase separator
YU-01135-B
TIP
Make appropriate bolts "3" as shown available
by yourself and attach the tool with them.
ECA22290
NOTICE
Do not use a hammer to drive out the crank-
shaft.
EAM30492

CHECKING THE CRANKSHAFT

1. Measure:
• Crankshaft runout "a"
Out of specification  Replace the crank-
shaft.
TIP
Turn the crankshaft slowly.
Runout limit
0.050 mm (0.0020 in)
a
2. Measure:
• Crank assembly width "a"
Out of specification  Replace the crank-
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INSTALLING THE CRANKSHAFT

1. Install:
• Crankshaft assembly
TIP
Install the crankshaft assembly with the crank-
shaft installer pot "1", crankshaft installer bolt "2",
and adapter (M12) "3".
TIP
Hold the connecting rod at top dead center
(TDC) with one hand while turning the nut of the
crankshaft installer bolt with the other. Turn the
crankshaft installer bolt until the crankshaft as-
a
sembly bottoms against the bearing.
5-40
CRANKSHAFT
shaft.
Crank assembly width
59.95–60.00 mm (2.360–2.362 in)
Crankshaft installer pot
90890-01274
Installing pot
YU-90058
Crankshaft installer bolt
90890-01275
Bolt
YU-90060
Adapter (M12)
90890-01278
Adapter #3
YU-90063
1
3
2