Yamaha YZ250F

YZ250-F
	2007 Yamaha YZ250F
Manufacturer	Yamaha Motor Company
Production	2001-present
Class	Motocross
Engine	249 cc (15.2 cu in) single-cylinder, water-cooled, four-stroke, DOHC
Bore / stroke	77 mm × 53.6 mm (3.03 in × 2.11 in)
Power	39hp
Torque	78 ft·lbf
Transmission	5-speed
Suspension	KYB
Brakes	disc (front,back)
Tires	80/100-21, 100/90-19
Wheelbase	57.8 inches
Dimensions	L: 85 inches; W: 32.5 inches; H: 51.2 inches
Seat height	38.7 inches
Weight	204 lb (93 kg) (dry)
Fuel capacity	1.6 Gallons (2024 Model)
Related	Yamaha YZ450F ; Yamaha WR250F

The Yamaha YZ250F is a motocross motorcycle first released in 2001 by Yamaha. It features a DOHC, four-stroke engine and initially had a steel frame and subframe in 2001–2002. In 2003 it received an aluminum subframe, which was replaced in the 2006 model with an all-aluminum frame.

The YZ250F has been praised for combining the broad-power characteristics of a four-stroke engine with the light handling more common in smaller, 125 cc two-stroke motorcycles.

Despite the similar name to the YZ250, very few parts have been shared between the models through their history.

Significant advances

2003	Automatic decompression exhaust cam
2006	Aluminium frame
2008	New engine
2010	New engine layout, with lower center of gravity
2014	Rear slant cylinder, 4-Valve head, Fuel Injection
2019	Electric starter