Yamaha WR450F (2003-04)

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The Yamaha WR 450F motorcycle was produced in 2003-04, with a four-stroke, single cylinder engine, featuring 5 titanium valve per cylinder, and a capacity of 449 cc. The bike is liquid-cooled, with a 12.5:1 compression ratio and wet sump lubrication. The ignition is digital CDI, and the bike can be started with either an electric or kick-starter. It has a maximum power of 58 hp / 42.3 kW at 9000 rpm and max torque of 49 Nm / 33.1 lb-ft at 7000 rpm. The clutch is wet, multiple discs, cable-operated, and it has a 5-speed transmission with final drive via an “O”-ring chain.

The bike features a steel single cradle frame, with a front suspension consisting of a 46mm Kayaba inverted telescopic fork that is compression and rebound damping adjustable. The front wheel travel is 300 mm / 11.8 in, and the rear suspension is a fully adjustable Kayaba single shock with separate speed compression adjustment. The rear wheel travel is 318 mm / 12.4 in. The front brakes are a single 250mm disc 4 piston caliper, while the rear brakes are a single 245mm disc 2-piston caliper. The bike also comes with a front tire size of 80/100-21 and a rear tire size of 110/100-18.

In terms of dimensions, the bike is 2175 mm / 85.6 in in length, 825 mm / 32.5 in in width, and 1300 mm / 51.2 in in height. It has a wheelbase of 1485 mm / 58.5 in, a ground clearance of 365 mm / 14.3 in, and a seat height of 998 mm / 39.3 in. The bike has a dry weight of 112.5 kg / 248 lbs and a wet weight of 122 kg / 268 lbs. The fuel capacity is 8 liters / 2.1 US gal.

Technical specifications:

Make Model: Yamaha WR 450F

Year: 2003 – 04


Engine: Four stroke, single cylinder, DOHC, 5 titanium valve per cylinder.
Capacity: 449 cc / 27.4 in
Bore x Stroke: 95 x 63.4 mm
Cooling System: Liquid cooled
Compression Ratio: 12.5:1
Lubrication: Wet Sump
Induction: 39mm Keihin FCR flat-slide throttle position sensor
Ignition: Digital CDI
Starting: Electric / Kick-starter
Max Power: 58 hp / 42.3 kW @ 9000 rpm
Max Torque: 49 Nm / 33.1 lb-ft @ 7000 rpm
Clutch: Wet, multiple discs, cable operated
Transmission: 5 Speed
Final Drive: “O” ring Chain
Frame: Steel, Single cradle frame

Front Suspension: 46mm Kayaba inverted telescopic fork, compression and rebound damping adjustable
Front Wheel Travel: 300 mm / 11.8 in
Rear Suspension: Fully adjustable Kayaba single shock, 315mm wheel travel, separate speed compression adjustment
Rear Wheel Travel: 318 mm / 12.4 in
Front Brakes: Single 250mm disc 4 piston caliper
Rear Brakes: Single 245mm disc 2-piston caliper
Front Tyre: 80/100-21
Rear Tyre: 110/100-18
Dimensions: Length 2175 mm / 85.6 in Width 825 mm / 32.5 in Height 1300 mm / 51.2 in
Wheelbase: 1485 mm / 58.5 in
Ground Clearance: 365 mm / 14.3 in
Seat Height: 998 mm / 39.3 in
Dry Weight: 112.5 kg / 248 lbs
Wet Weight: 122 kg / 268 lbs
Fuel Capacity: 8 Liters / 2.1 US gal

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