Yamaha YZ250 User Manual

1-3
IMPORTANT INFORMATION
GEN
INFO
EC130000
IMPORTANT INFORMATION
EC131010
PREPARATION FOR REMOVAL AND DIS
ASSEMBLY
1. Remove all dirt, mud, dust, and foreign
material before removal and disassembly.
When washing the machine with high pres-
sured water, cover the parts as follows.
9
Silencer exhaust port
9
Side cover air intake port
9
Water pump housing hole at the bottom
2. Use proper tools and cleaning equipment.
Refer to “SPECIAL TOOLS” section.
3. When disassembling the machine, keep
mated parts together. They include gears,
cylinders, pistons, and other mated parts
that have been “mated” through normal
wear. Mated parts must be reused as an
assembly or replaced.
4. During the machine disassembly, clean all
parts and place them in trays in the order of
disassembly. This will speed up assembly
time and help assure that all parts are cor-
rectly reinstalled.
5. Keep away from fire.
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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