Yamaha YZ250

Last updated
YZ250
YZ250.jpg
Manufacturer Yamaha
Production1974–present
Successor Yamaha YZ450F
Class Motocross
Engine 249 cc (15.2 cu in) water-cooled reed-valve two-stroke single
Transmission 5-speed
Suspension Monoshock, 12.8 inches travel
Brakes Double disc
Tires Front: 80/100-21-51M
Rear: 110/90-19-62M
Wheelbase 1,470 mm (57.8 in)
DimensionsL: 2,200 mm (85 in)
W: 830 mm (32.5 in)
H: 1,300 mm (51.2 in)
Seat height990 mm (39.1 in)
Weight103 kg (227 lb) (US 2014 model) (wet)
Fuel capacity7.9 L; 1.7 imp gal (2.1 US gal)
Related Yamaha YZ450F

The Yamaha YZ250 is a two-stroke motocross race bike made by Yamaha. The model was launched in 1974, and has been regularly updated and is still in production with new releases every year.

Contents

Engine

The original YZ250 of 1974 used an air-cooled 250cc two-stroke engine of 70 mm bore and a 64 mm stroke, which was improved semi-annually. The air-cooled motor was replaced in 1982 with a 249 cc liquid-cooled two-stroke reed-valved engine with a YPVS exhaust valve for a wider spread of power. The bore on the water-cooled engine was reduced to 68 mm and the stroke was increased to 68 mm producing a displacement of 247 cc. In 1999, the bore was further reduced to 66.4 mm and the stroke lengthened to 72 mm producing a displacement of 249 cc. The longer stroke engine resulted in a lower redline, slightly less top end power and greatly improved torque at lower RPM. The engine produces a peak 48.8 horsepower (36.4 kW) at 8,800 rpm and 30.6 foot-pounds force (41.5 N⋅m) of torque at 7,500 rpm, with a 9,000 rpm redline. [1]

Chassis

On its introduction in 1974, the YZ250 used a single backbone steel frame with a twin-shock swingarm. The following year, reflecting the factory racer Hakan Andersson's factory racer, the swingarm became a monoshock unit, initially made of steel, then aluminum from 1978. The swingarm rear suspension system featured more than 12" of travel, while the telescopic inverted front forks had 11.8 inches (300 mm) of travel. [2] In the 2005 model year, the YZ250 gained a new frame made from aluminum that reduced the dry weight to approximately 212 lb (96 kg). All YZ250s feature front and rear hydraulic disc brakes. The 2014 US model had wet weight of 227 lbs. [3]

Timeline

1999First year of the current engine
2002First year of the current frame geometry and bodywork
2003Exhaust port raised about 0.5 mm and higher compression head for USA model.
2005Aluminium frame
2006 KYB SSS forks
2007Pro Taper 1-1/8 handlebars
2008Smaller fork lugs and shorter lower tubes. Brake calipers also reduced in size + wave rotors.
2011No more US model: Bigger silencer and a neutral switch for sound checks. Low compression head.
2015New body work (compatible with 2002–2014 bikes). Smaller fork tubes (at top clamp) from the four-stroke.

Racing

See also

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References

  1. "Every Champ | Motocross Action Magazine". motocrossactionmag.com. Archived from the original on 2014-06-25.
  2. "2008 Yamaha YZ250 Specifications, specs, spec".
  3. "2014 Yamaha YZ250 Specifications, specs". web.archive.org. 2013-06-21. Retrieved 2023-12-23.
  4. 1 2 "EVERY CHAMP | Motocross Action".
  5. "AMAMotocross.com - 2004 AMA THQ Supercross Series results".
  6. "Raines Racing". www.rainesracing.com.