Yamaha YZ250 2022 User Manual

CRANKSHAFT
5-40
EAM30491
REMOVING THE CRANKSHAFT
1. Remove:
• Crankshaft “1”
(with the crankcase separating tool “2”)
TIP
Make appropriate bolts “3” as shown available
by yourself and attach the tool with them.
NOTICE
ECA22290
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.
2. Measure:
• Crank assembly width “a”
Out of specification  Replace the crank-
shaft.
EAM30493
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-
sembly bottoms against the bearing.
Crankcase separating tool
90890-01135
Crankcase separator
YU-01135-B
Runout limit
0.050 mm (0.0020 in)
a
a
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
2
3

Yamaha YZ250 2022 Specifications

General

Engine Type	249cc liquid-cooled 2-stroke; reed-valve inducted
Bore x Stroke	66.4mm x 72.0mm
Compression Ratio	8.9~10.6:1
Ignition	CDI
Transmission	5-speed; multiplate wet clutch
Final Drive	Chain
Suspension Rear	KYB® single shock; fully adjustable, 12.4-in travel
Brakes Front	Hydraulic disc, 270mm
Tires Front	80/100-21
Tires Rear	110/90-19
Seat Height	38.2 in
Wheelbase	58.5 in
Ground Clearance	14.2 in
Fuel Capacity	2.1 gal
Wet Weight	227 lb
Suspension Front	KYB® inverted fork; fully adjustable, 11.8-in travel
Brakes Rear	Hydraulic disc, 245mm