The Yamaha WR250F and WR250R are enduro off-road motorcycles produced since 2001. The bikes are detuned descendents of the highly competitive YZ four-stroke series of motocross bikes and share much of the same architecture of the YZ models. The WR250R is the dual-sport version of the WR250F. Both versions featured four-stroke, liquid-cooled, single-cylinder engines. WR denotes the bikes possess a wide-ratio gearbox.
Yamaha developed its own engineering team separate from the YZ series team to develop the WF250F and WF250R motorcycles to make them virtual competition bikes but still legal for city streets. Yamaha engineers lifted the engine directly from the YZ250, and in most respects, the bikes resemble the YZ series. However, the WR250s come with a headlamp, trip meter, a larger gas tank, 18-inch rear wheels, wide-ratio transmission in either five or six speeds and a spark arrestor. The WF250s share with the YZ250 the same bodywork, including fame, chassis, wheels, suspension, brakes and seat. The WF250s feature an electric starter, but have an auto-decompression device for kick-starting the bike if the battery is dead.
The 2010 and 2011 Yamaha WR250F's engine displaces 250 cc with a 12.5-to-1 compression ratio and 3-inch bore and 2.1-inch stroke. A Keihin FCR37 carburetor delivers the fuel from the 2.1-gallon fuel tank to the engine while a five-speed wide-ratio chain-driven gearbox transfers the power to the wheels. The front suspension consists of an inverted fork with 11.8 inches of travel, and a single-shock rear suspension has 12.2 inches of travel. The bike rides on a 21-inch front wheel and 18-inch rear with 9.8- and 9.6-inch disc brakes respectively. Its dry weight is 260 lbs. The seat is 38.6 inches from the ground and the overall height at the handlebars is 51.1 inches. It measures 85.2 inches long and sits on a 58.3-inch wheelbase. The frame clears the ground by 14.4 inches.
Yamaha conceived the WF250R for the dual purpose of commuting during the week and riding the trails on the weekend. It sits lower than the WR250F, with an 11.8-inch ground clearance, but its high enough to navigate rough terrain without bottoming out. It shares the same characteristics of the Honda CRF230L dual-purpose bike, but its soul is closer to the screaming off-road YZ250. As a dual-purpose bike, the WR250R lacks hand guards and a skid plate, but it does feature mudguards and side panels found on the more rugged YZ bikes. Dual-purpose bikes have a reputation for soft handling off-road, but the WR250R's YZ-inspired suspension makes it manageable in the dirt.
The 2010 and 2011 WF250R features the same engine as the WR250R, but has a lower 11.8-to-1 compression ratio and fuel injection instead of carburetion. Its wide-ratio gearbox is a six-speed version. Its dual-purpose role gives it less travel in the front and rear than the WR20F, at 10.6 inches, but the wheel and disc brake dimensions are identical. The bike sits on a 55.9-inch wheelbase and measures 85.6 inches long. The fuel tank holds 2 gallons. The seat is 36.6 inches off the ground. Its dry weight is 298 lbs.