Yamaha WR450F
2010 Yamaha WR450F
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| Manufacturer | Yamaha Motor Company |
|---|---|
| Parent company | Yamaha Corporation |
| Class | Enduro |
| Engine | Single-cylinder, DOHC, Multivalve, water-cooled, four-stroke |
| Transmission | 5-speed, wet clutch, chain drive |
| Suspension |
Front: Kayaba inverted fork; fully adjustable |
| Brakes | Hydraulic single disc brakes |
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| Production | 1998-1999 |
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| Successor | WR426F |
| Engine | Five-valve, 400 cc |
| Fuel capacity | 3.2 US gal (12 l; 2.7 imp gal) |
| Production | 2001-2003 |
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| Predecessor | WR400F |
| Successor | WR450F |
| Engine | Titanium five-valve, 426 cc, 95mm x 60.1mm stroke, compression ratio 12.5:1 |
| Brakes | 250mm front, 245mm rear |
| Wheelbase | 58.7 in (1,490 mm) |
| Fuel capacity | 3.2 US gal (12 l; 2.7 imp gal) |
| Production | 2003 through 2006 |
|---|---|
| Predecessor | WR426F |
| Engine | Titanium five-valve, 449 cc, 95mm x 63.4mm stroke, compression ratio 12.3:1 |
| Frame type | Steel |
| Suspension | Front: 11.8 in (300 mm) travel Rear: 11.6-in travel |
| Brakes | Front: 250 mm disc Rear: 245 mm disc |
| 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) (dry) 273 lb (124 kg) (wet) |
| Fuel capacity | 2.6 US gal (9.8 l; 2.2 imp gal) 2003-2005, 2.1 US gal (7.9 L) 2006 |
| Related | YZ450F, WR250F |
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2010 Yamaha WR450F
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|
| Manufacturer | Yamaha Motor Corporation |
|---|---|
| Production | 2007 through 2015 |
| Predecessor | WR450F |
| Engine | Titanium five-valve, 449 cc, 95mm x 63.4mm stroke, compression ratio 12.3:1 |
| Transmission | 5-speed, constant mesh |
| Frame type | Aluminum, semi-double cradle |
| Suspension | Front: KYB cartridge forks with 11.8 in (300 mm) travel Rear: KYB shock with 12 in (305 mm) travel |
| Brakes | Front: 250 mm disc Rear: 245 mm disc |
| Tires | Front: 80/100-21 51M Rear: 110/100-18 64M |
| Rake, trail | 27.3°, 117 mm (4.6 in) |
| Wheelbase | 1,485 mm (58 in) |
| Dimensions |
L: 2,175 mm (86 in) W: 825 mm (32 in) H: 1,295 mm (51 in) |
| Seat height | 980 mm (39 in) |
| Weight | 248 lb (112 kg) (dry) 273 lb (124 kg) (wet) |
| Fuel capacity | 2.11 US gal (8.0 L) |
| Related | YZ450F, WR250F |
| Production | Since 2016 |
|---|---|
| Predecessor | WR450F |
| Engine | Fuel-injected, Titanium four-valve, 97.0 mm x 60.8 mm stroke, compression ratio 12.5:1 |
| Suspension | Front: 12.2 in (310 mm) travel Rear: 12.5 in (318 mm) travel |
| Brakes | Front: 270 mm disc Rear: 245 mm disc |
| Tires | Front: 80/100-21 51M Rear: 120/90-18 64M |
| Wheelbase | 57.7 in (1,466 mm) |
| Dimensions |
L: 85.2 in (2,164 mm) W: 32.5 in (826 mm) H: 50.4 in (1,280 mm) |
| Seat height | 38.0 in (965 mm) |
| Weight | 249 lb (113 kg) (dry) 271 lb (123 kg) (wet) |
| Fuel capacity | 2.0 US gal (7.6 l; 1.7 imp gal) |
| Related | Yamaha YZ250FX |
Front: Kayaba inverted fork; fully adjustable
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 racing 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 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. Over much of its life the weight of the WR450F has remained fairly constant ranging from 244 to 249 pounds dry weight.
Yamaha introduced the WR 400F in 1998. The 400F is a 400 cc (24 cu in) 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.
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. A beefier YZ style clutch basket and plates than those on the WR400 improved clutch performance. Frame geometry was identical to the 2002 YZ250 and YZ426F with a 58.7 inch wheelbase and 14.7 inches of ground clearance. This was the last WR to make use of a manual compression release for starting.
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