Yamaha YZ250 2022 User Manual

WATER PUMP
6-6
EAM30494
DISASSEMBLING THE WATER PUMP
TIP
• Remove the oil seal when the coolant level
changes frequently more than usual, coolant
has discolored, or engine oil has become
milky.
• Do not use the removed oil seal.
1. Remove:
• Oil seal “1”
EAM30259
CHECKING THE WATER PUMP
1. Check:
• Water pump housing cover
• Impeller shaft
• Impeller
Cracks/damage/wear  Replace.
2. Check:
• Bearing “1”
Rotate the inner race with your finger.
Rough spot/seizure  Replace.
EAM30262
ASSEMBLING THE WATER PUMP
1. Install:
• Oil seal “1”
TIP
• Apply the lithium-soap-based grease on the oil
seal lip.
• Install the oil seal with its manufacture’s marks
or numbers facing the crankcase cover (right).
2. Install:
• Bearing “1”
TIP
Install the bearing by pressing its outer race par-
allel.
3. Install:
• Impeller shaft assembly “1”
• Washer “2”
• Circlip
• Impeller “3”
TIP
• Take care so that the oil seal lip is not dam-
aged or the spring does not slip off its position.
• When installing the impeller shaft, apply the
lithium-soap-based grease on the oil seal lip
and impeller shaft. And install the shaft while
turning it.
• Hold the impeller shaft on its width across the
flats “a” with spanners, etc. and install the im-
peller.
New
Impeller
14 N·m (1.4 kgf·m, 10 lb·ft)
1
1
New
T
R
.
.

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