Yamaha TZ 250

Yamaha TZ 250^[1]

Manufacturer	Yamaha
Production	1973–2004
Class	Grand Prix motorcycle racing
Engine	247–249 cc (15.1–15.2 cu in), 2-cylinder, 2-stroke
Bore / stroke	56 mm × 50.7 mm (2.20 in × 2.00 in)
Top speed	over 240 km/h (150 mph)
Power	51 bhp (38 kW) @ 10,500 rpm to 76 bhp (57 kW) @ 11,750 rpm
Torque	47.1 N⋅m (34.7 lb⋅ft) @ 11,500 rpm
Transmission	6-speed
Brakes	Front: Dual 280 mm (11 in) discs Rear: Single 210 mm (8.3 in) disc
Tires	Front: 3.25/4.75 R17 Rear: 3.80/6.00 R17
Wheelbase	1,312–1,328 mm (51.7–52.3 in)
Dimensions	L: 1,920 mm (76 in) W: 650 mm (26 in) H: 1,085 mm (42.7 in)
Weight	98–108 kg (216–238 lb) (dry)
Fuel capacity	23.5 L (5.2 imp gal; 6.2 US gal)

The Yamaha TZ 250 was a commercially available racing motorcycle with a watercooled, two-stroke, 250 cc engine produced by the Japanese manufacturer Yamaha.

The basis of the production-volume racer was the OW17 factory machine from Yamaha, which was used in the motorcycle world championship from 1973 to 1990, and with which Dieter Braun became motorcycle world champion in the class up to 250 cm³ in 1973. The almost identical Yamaha TZ 350 was manufactured with a larger bore (64 instead of 54 mm).^{[2][3][4][5][6][7]}