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YZ 250
Displacement249.0 ccm (15.19 cubic inches)
CYLINDREE249.0 cm³
Engine detailsSingle cylinder, two-stroke
Compression9.1:1
Bore x stroke66.4 x 72.0 mm (2.6 x 2.8 inches)
Valves per cylinder1
Fuel systemCarburettor
Fuel controlDouble Overhead Cams/Twin Cam (DOHC)
IgnitionDigital CDI 
Lubrication systemDry sump
Cooling systemLiquid
Gearbox5-spee...
Displacement249.0 ccm (15.19 cubic inches)
CYLINDREE249.0 cm³
Engine detailsSingle cylinder, two-stroke
Compression9.1:1
Bore x stroke66.4 x 72.0 mm (2.6 x 2.8 inches)
Valves per cylinder1
Fuel systemCarburettor
Fuel controlDouble Overhead Cams/Twin Cam (DOHC)
IgnitionDigital CDI 
Lubrication systemDry sump
Cooling systemLiquid
Gearbox5-speed
Transmission typeChain   (final drive)
ClutchWet, multiple discs, cable operated
Frame typeAluminium Bilateral Beam
Rake (fork angle)27.0°
Trail115 mm (4.5 inches)
Front suspension48mm Kayaba inverted cartridge fork w/adjustable compression and rebound damping
Front wheel travel (mm)300 mm (11.8 inches)
Rear suspensionKayaba single shock w/adjustable preload, compression and rebound damping separate hi/lo-speed compression adjusters
Rear wheel travel (mm)315 mm (12.4 inches)
Front tyre80/80-21
Rear tyre110/90-19
Front brakesSingle disc. Two-piston calipers.
Front brakes diameter250 mm (9.8 inches)
Rear brakesSingle disc. Single-piston caliper.
Rear brakes diameter245 mm (9.6 inches)
Dry weight106.0 kg (233.7 pounds)
Weight incl. oil, gas, etc129.0 kg (284.4 pounds)
Seat height991 mm (39.0 inches) If adjustable, lowest setting.
Overall height1308 mm (51.5 inches)
Overall length2182 mm (85.9 inches)
Overall width828 mm (32.6 inches)
Ground clearance335 mm (13.2 inches)
Wheelbase1486 mm (58.5 inches)
Fuel capacity7.94 litres (2.10 US gallons)
Oil capacity1.10 litres (1.16 US quarts)
Color optionsTeam Yamaha Blue/White
StarterElectric & kick
Engine oil10W-30 BIS 20W-50
Brake fluidDOT 4
Coolant1.00 litres (0.26 US gallons)
Spark plugsNGK CR8E, NGK CR8EIX
Idle speed2000 +/- 100 RPM
Chain size520
Chain links114
Sprockets13/51 (front/rear)
ProfilationBred For Battle. We built the first production YZ250 in 1975. It commenced kicking tail immediately and promptly set the standard by which competition bikes were measured. Even after all the victories and championships since then, including more AMA Supercross wins this season than anybody else (per Chad Reed), our beloved Supercross contender continues its relentless march toward perfection.
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