Segment: Enduro/Offroad
Production years: 2002, 2003
The Yamaha WR450F was an off-road motorcycle manufactured by Yamaha, first introduced in 1998 with a 400cc engine. The bike shared many components with the YZ400F motocross model.
The machine was basically a racing YZ450F with a slightly detuned engine for more controllable power, packing a headlight and a lighting coil, a softer suspension, a kickstand, a larger radiator, lower emissions, and lower noise specifications.
The first generation of the WR400F was introduced in 1998, a related motorcycle to the YZ400F motocross model. The WR400F was considered a groundbreaking model in motorcycle history with an impressive record of reliability.
In 2003, Yamaha launched the WR450F, a motorcycle in its third generation manufactured from 2003 to 2006 that received a displacement increase, a smaller fuel tank, and an electric starter as standard features.
In addition, Yamaha released a limited production version of the WR450F, with a 2-trac designation, which featured a two-wheel drive. The front wheel received a maximum of 15 percent power from the engine through an oil pipe.
The 2003 Yamaha WR450F had a single-cradle steel frame that housed a 449cc four-stroke liquid-cooled single-cylinder engine with 58 hp on tap at 9,000 rpm and 49 Nm (36 lb-ft) torque at 7,000 rpm.
The bike's suspension was handled by a 46 mm inverted Kayaba adjustable telescopic fork on the front and a fully-adjustable Kayaba shock absorber on the rear, delivering excellent off-road handling capabilities.
engine specs | Type: | liquid-cooled, 5-valve, DOHC, 4-stroke w/titanium valves | Displacement: | 449 cm3 | Bore X Stroke: | 3.7x2.5 in OR 94 mm | Compression Ratio: | 13.5:1 | Horsepower: | 58/9000 KW(hp)/RPM | Torque: | 36/7000 lb-ft/RPM OR 49/7000 Nm/RPM | Fuel System: | 39mm Keihin FCR flat-slide w/throttle position sensor |
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transmission specs | Gearbox: | 5 speed, manual, wide ratio | Clutch: | Multiplate wet clutch | Primary Drive: | - | Final Drive: | #520 O-ring chain |
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chassis specs | Frame: | Steel | Front Suspension: | 46mm Kayaba inverted telescopic fork w/adjustable compression and rebound damping; 11.8" travel | Rear Suspension: | Fully adjustable Kayaba single shock, 12.4" travel; separate hi/lo speed compression adjustment | Front Brake: | 250mm floating disc | Rear Brake: | 245mm disc |
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dimension specs | Overall Length: | 85.4 in OR 2169 mm | Overall Width: | 32.5 in OR 826 mm | Seat Height: | 39.2 in OR 996 mm | Wheelbase: | 58.4 in OR 1483 mm | Ground Clearance: | 14.6 in OR 371 mm | Weight: | - | Fuel Capacity: | 2.6 gallons OR 9.8 L |
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tyres specs | Front: | 80/100-21 Dunlop | Rear: | 110/100-18 Dunlop |
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power system specs | Power pack: | - | Nominal Capacity: | - | Maximum Capacity: | - | Charger type: | - | Charging time (normal): | - | Charging time (quick): | - | Range: | - |
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