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With the competition advancing, Yamaha made some major changes to the model. This included style updates, like an under seat twin exhaust, and performance upgrades including radial brakes, and, for the first time an R1 Ram-air intake. Furthermore, the tendency for wheelies by earlier productions was reduced by changing the geometry of the frame and weight distribution. The all-new engine was no longer used as a stressed member of the chassis, and featured a separate top crankcase and cylinder block.

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The 2004 R1 weighs 172 kilograms (380 lb) dry. The conventional front brake calipers were replaced by radially mounted calipers, activated by a radial master cylinder. A factory-installed steering damper was also added this year. Combined with the changes to the frame, this helped to eliminate the tendency of the handlebars to shake violently during rapid acceleration or deceleration on less-than-perfect surfaces.

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Motorcycle Consumer News tests of the 2004 model year YZF-R1 yielded a 0 to 60 mph (0 to 97 km/h) time of 3.04 seconds and 0 to 100 mph (0 to 161 km/h) of 5.42 seconds, a quarter-mile time of 9.90 seconds at 144.98 mph (233.32 km/h)

ENGINE SPECS

Engine Type: 998 cc, 4 Stroke - Liquid Cooled - Inline-4

Engine Bore and Stroke: 77 mm x 53.6 mm

Compression Ratio: 12.3:1

Valves DOHC, 4 valves/cylinder

Carburetion:

Fuel injection, dual-valve throttle bodies with motor-driven secondary valves

Ignition System: Digital TCI

Claimed Horsepower: 180 hp (132 kW) @ 12500 rpm

Maximum Torque: 103.9 Nm (76.3 ft. lbs) @ 10500 rpm

Type of Lubrication: Wet sump

Clutch System: multi-plate

Drive System:

Gear Ratios:

1st 2.533,

2nd 2.063,

3th 1.762,

4th 1.522,

5th 1.364,

6th 1.269

Primary Drive Ratio: 65/43 (1.512)

Final Drive: Chain, 45/17 (2.647)

Starting: Electronic

CHASSIS SPECS

Frame Deltabox V out of aluminium

Suspension Front: 43mm inverted telescopic fork w/adjustable preload, compression and rebound damping, 120 mm travel

Suspension Rear: Single shock w/piggyback reservoir and adjustable preload, compression and rebound damping,

130 mm travel Front Fork - Rake & Trail Angles: 24 / 97 mm (3.8 inches)

WHEELS & TYRE SPECS

Front wheel 3.50 Rear wheel 6.00

Tire - Front: 120/70-17 Tire - Rear: 190/50-17

Brakes - Front: dual 320 mm discs with radial-mounted 4-piston calipers

Brakes - Rear: single 220 mm disc with 1-piston calipers

DIMENSIONS

Overall - Length: 2065 mm (81.3 inches)

Overall - Width: 720 mm (28.3 inches)

Overall - Height: 1105 mm (43.5 inches)

Seat Height: 835 mm (32.9 inches)

Wheelbase 1395 mm (54.9 inches)

Ground clearance 135 mm (5.3 inches)

Fuel Capacity: 18 l (4.8 Gal)

Dry Weight (without fluids): 172 kg (379.2 pounds)