2004Kawasaki Ninja ZX-6R

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The 2004 Kawasaki Ninja ZX-6R is a lightweight middleweight sportbike designed for riders seeking sharp handling and aggressive styling. Its 636cc in-line four engine delivers 125 horsepower with excellent power-to-weight ratio, making it ideal for track days and spirited road riding. Known for its responsive performance and agile chassis, this bike remains a favorite among sport-focused enthusiasts.

Capacity: 636.0 ccm
Engine: In-line four, four-stroke
Gearbox: 6-speed
Dry weight: 161.0 kg
Seat height: 825 mm
Power: 125.0 HP (91.9 kW)

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How it rides

Editorial estimate from the spec sheet - not lab tested

Off-road & trail5%

Cornering93%

City riding45%

Daily riding40%

Touring30%

Two-up30%

Track92%

Best for: Built primarily for spirited canyon carving and track days, with razor-sharp handling as its main selling point over outright straight-line power.
Built for: A revvy, precise, and eager middleweight that rewards riders who like to work the gearbox and chase the tach needle through corners.
Not ideal for: Not a good fit for new riders, anyone prioritizing all-day comfort, or those planning to load it up with luggage and a passenger for long-distance touring.

Scores are derived from the spec sheet using the same model across every bike, so they compare like for like.

Will it fit you?

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Your height

Inseam (optional)

Units

At 825mm, a rider of 68.9" with a 31" (estimated) inseam will reach the ground with balls of both feet on the 2004 Kawasaki Ninja ZX-6R, with a cramped knee angle of around 70 degrees and a forward-leaning riding position.

Assumes about 30mm of suspension sag once seated. This is an approximation from category-typical geometry, not a measurement of this bike or of you - sit on one before you buy.

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Full specifications

Engine

Capacity: 636.0 ccm
Power: 125.0 HP (91.9 kW)
Torque: 67.0 Nm (6.8 kgf-m)
Engine type: In-line four, four-stroke
Power/weight ratio: 0.7764 HP/kg (dry)
Bore x stroke: 68.0 x 43.8 mm
Compression: 12.9:1
Cooling system: Liquid
Fuel system: Injection
Starting: Electric
Ignition: Digital
Valves per cylinder: 4
Lubrication system: Forced lubrication, wet sump

Transmission

Gearbox: 6-speed
Transmission type: Manual
Final drive: Chain
Clutch: Wet multi-disc, manual

Performance

0-60 mph: 2.90 seconds
0-100 km/h (0-62 mph): 3.40 seconds

Dimensions & weight

Wheelbase: 1400 mm
Overall length: 2030 mm
Overall width: 730 mm
Overall height: 1175 mm
Seat height: 825 mm
Dry weight: 161.0 kg
Wet weight: 192.1 kg
Ground clearance: 145 mm

Chassis & suspension

Frame: Twin spar aluminum
Front suspension: 41mm inverted cartridge fork with rebound and compression damping, plus spring preload adjustability and top-out springs
Rear suspension: Bottom-link UNI-TRAK® with gas-charged shock, stepless compression and rebound damping, spring preload adjustability and top-out spring
Front wheel travel: 119 mm
Rear wheel travel: 132 mm
Rake (fork angle): 23.5°
Trail: 102 mm

Brakes & wheels

Front brakes: Double disc. Semi-floating petal discs with dual radial-mounted, four-piston calipers.
Front brakes diameter: 300 mm
Rear brakes: Single disc. Petal disc with single-caliper piston.
Rear brakes diameter: 220 mm
Front tyre: 120/65-ZR17
Rear tyre: 180/55-ZR17