Yamaha YZ250 User Manual

4-53
WATER PUMP
ENG
EC4G3000
REMOVAL POINTS
EC4G3110
Impeller shaft
1. Remove:
9
Impeller 1
9
Plain washer 2
9
Impeller shaft 3
NOTE:
Hold the impeller shaft on its width across the
flats a with spanners, etc. and remove the
impeller.
EC4G3210
Oil seal
NOTE:
It is not necessary to disassemble the water
pump, unless there is an abnormality such as
excessive change in coolant level, discoloration
of coolant, or milky transmission oil.
1. Remove:
9
Bearing 1
2. Remove:
9
Oil seal 1
EC4G4000
INSPECTION
EC444200
Impeller shaft
1. Inspect:
9
Impeller shaft 1
Bend/Wear/Damage
→ Replace.
Fur deposits
→ Clean.
1P8-9-30-4C 21/5/04 12:59 PM Page 8

Yamaha YZ250 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
Brakes Rear	Hydraulic disc, 240mm
Tires Front	80/100-21
Tires Rear	110/90-19
Length	85.8 in
Width	32.5 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
Fuel Delivery	Keihin PWK38S carburetor