Yamaha YZ250 User Manual

7-14
SETTING
TUN
EC72N000
Drive and driven sprockets setting parts
EC721003
Tire pressure
Tire pressure should be adjust to suit the road
surface condition of the circuit.
9
Under a rainy, muddy, sandy, or slippery condi-
tion, the tire pressure should be lower for a larg-
er area of contact with the road surface.
9
Under a stony or hard road condition, the tire
pressure should be higher to prevent a flat tire.
Part name Size Part number
Drive sprocket
11
13T 9383E-13144
(STD) 14T 9383E-14215
Driven sprocket
22
47T 1C3 -25447-00
48T 1C3 -25448-00
*(STD) 49T 1C3
-25449-00
(STD) 50T 1C3
-25450-00
51T 1C3 -25451-00
52T 1C3 -25452-00
Standard tire pressure:
100 kPa (1.0 kgf/cm
2
, 15 psi)
Extent of adjustment:
60~80 kPa
(0.6~0.8 kgf/cm
2
, 9.0~12 psi)
Extent of adjustment:
100~120 kPa
(1.0~1.2 kgf/cm
2
, 15~18 psi)
*For EUROPE and CDN
1P8-9-30-7 20/5/04 2:10 PM Page 32

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