2010 Yamaha WR450F |
|
Manufacturer | Yamaha Motor Company |
---|---|
Parent company | Yamaha Corporation |
Model year | Since 1998 |
Class | Enduro |
The Yamaha WR450F is an off-road motorcycle made by Yamaha Motor Company. It currently has a 450 cc (27 cu in) liquid-cooled single-cylinder engine. First offered in 1998 at 400cc, it shared many components and design concepts with the YZ400F motocross model. It is basically the YZ450F detuned slightly for more controllable power, with a headlight and lighting coil, softer suspension, a kickstand, lower noise specifications, larger radiators and lower emissions. The WR in the name indicates a wide-ratio gear box common to most enduro or trail bikes and stands in contrast to the close-ratio gearbox essential to a motocross racer. Over the years the WR has benefited from the advances made in the YZ motocross version gaining displacement and advancements such as an aluminum frame and improved suspension.
Contents |
Yamaha introduced the WR400F in 1998. The 400F is a four-stroke off-road motorcycle produced for three years, beginning in 1998 and ending in 2000 (only the YZ was upgraded to 426 cc in 2000). The WR400F is related to the YZ400F, a motocross model. Like the YZ400, it was considered to be a groundbreaking model in motorcycle history, ushering in the four-stroke era which ended the dominance of two-stroke engines in motocross and offroad racing. While many modern performance four-stroke dirt bikes have been criticized for excessive rebuild costs and short motor lifespans, the Yamaha WR400F has an impressive record of reliability, often attributed to its steel valves and generous oil capacity.
Production | 1998-1999 |
---|---|
Successor | WR426F |
Engine | 400 cc (24 cu in) single-cylinder, water-cooled, four-stroke, DOHC five valves |
Transmission | 5-speed |
Suspension |
Front: Kayaba inverted fork; fully adjustable |
Brakes | Front: hydraulic single disc brake Rear: hydraulic single disc brake |
Fuel capacity | 3.2 US gal (12 l; 2.7 imp gal) |
Production | 2001-2003 |
---|---|
Predecessor | WR400F |
Successor | WR450F |
Engine | 426 cc (26.0 cu in) single-cylinder, water-cooled, four-stroke, DOHC titanium five valve |
Transmission | 5-speed |
Suspension |
Front: Kayaba inverted fork; fully adjustable |
Brakes | Front: hydraulic single disc brake Rear: hydraulic single disc brake |
Wheelbase | 58.7 in (1,490 mm) |
Fuel capacity | 3.2 US gal (12 l; 2.7 imp gal) |
In 2001 the WR400F's engine was uprated and it became the WR426F increasing the displacement to 426 cc (26.0 cu in) for greater power and throttle response.
Predecessor | WR426F |
---|---|
Engine | single-cylinder 449 cc (27.4 cu in) liquid-cooled DOHC four-stroke 5 titanium valves, 95.0 mm x 63.4 mm stroke, compression ratio 12.3:1 |
Transmission | 5-speed, wet clutch, chain drive |
Frame type | Aluminum after 2007 |
Suspension |
Front: inverted fork; fully adjustable, 11.8 in (300 mm) travel |
Brakes | Front: hydraulic single disc brake, 250 mm Rear: hydraulic single disc brake, 245 mm |
Tires | Front: 80/100-21 51M Rear: 110/100-18 64M |
Wheelbase | 58.5 in (1,486 mm) |
Dimensions | L 85.6 in (2,174 mm) W 32.5 in (826 mm) H 51 in (1,295 mm) |
Seat height | 38.6 in (980 mm) |
Weight | 244 lb (111 kg) - 249 lb (113 kg) (dry) |
Fuel capacity | 2.6 US gal (9.8 l; 2.2 imp gal) before 2005, 2.1 US gal (7.9 L) after 2005 |
Related | YZ450F, WR250F |
For 2003, the engine displacement was increased to 449 cc, the fuel tank was reduced to 2.6 gallons [4] and the bike came with an electric starter as standard equipment. The 2005 WR weighed in at 244 pounds dry, the seat height was reduced to 38 inches and the fuel tank was decreased to 2.1 gallons.[4][5] The 2006 WR weighed in at 249 pounds dry[4] and produced 42 horespower.[6] For 2007, the WR gained restyled plastics and an aluminum frame dropping the weight from 249 to 246 pounds. .[7] Over much of its life the weight of the WR450F has remained fairly constant ranging from 244 to 249 pounds dry weight.[4]
|