Motocross Bikes
1991ATK 604 MX
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The 1991 ATK 604 MX is a competitive motocross machine powered by a 562cc single-cylinder four-stroke engine producing 40 horsepower. Built for serious off-road racers, it features a five-speed transmission, DOHC valve train, and dry-sump lubrication for reliable performance in demanding conditions. Known for its lightweight construction and nimble handling, this Austrian-built bike excels in technical terrain and tight courses.
- Capacity
- 562.0 ccm
- Engine
- Single, four-stroke
- Gearbox
- 5-speed
- Dry weight
- 122.9 kg
- Seat height
- 950 mm
- Power
- 40.0 HP (29.4 kW)
How it rides
Editorial estimate from the spec sheet - not lab tested- Best for
- Built purely for motocross and open-terrain competition, not for street use or commuting.
- Built for
- Raw, torquey, and mechanical in feel, with premium WP suspension and a big air-cooled single that delivers old-school four-stroke motocross character rather than modern refined power.
- Not ideal for
- Not suitable for anyone wanting a comfortable, low-maintenance daily rider, a passenger-friendly bike, or a machine capable of highway 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?
Worked out in your browser - nothing is sent to usEngine
- Capacity
- 562.0 ccm
- Power
- 40.0 HP (29.4 kW)
- Engine type
- Single, four-stroke
- Power/weight ratio
- 0.3255 HP/kg (dry)
- Bore x stroke
- 94.0 x 81.0 mm
- Compression
- 9.8:1
- Cooling system
- Air
- Fuel system
- Carburettor
- Starting
- Electric & kick
- Ignition
- CDI - Electric Advancing System
- Valves per cylinder
- 4
- Lubrication system
- Dry Sump System
Transmission
- Gearbox
- 5-speed
- Transmission type
- Manual
- Final drive
- Chain
- Clutch
- wet plate
Dimensions & weight
- Wheelbase
- 1473 mm
- Overall width
- 860 mm
- Seat height
- 950 mm
- Dry weight
- 122.9 kg
- Fuel capacity
- 17.40 litres
- Ground clearance
- 343 mm
- Oil capacity
- 2.30 litres
Chassis & suspension
- Frame
- Nickel-Plated-Heat-Treated-Chromoly
- Front suspension
- WP Adjustable USD
- Rear suspension
- WP Multi-Adjuster Shock (Linkless)
- Front wheel travel
- 300 mm
- Rear wheel travel
- 330 mm
Brakes & wheels
- Front brakes
- Single disc. 2-piston calipers
- Front brakes diameter
- 240 mm
- Rear brakes
- Single disc. Disk mounted on front-sprocket . 1 piston caliper
- Rear brakes diameter
- 140 mm
- Front tyre
- 80/100-21
- Rear tyre
- 120/90-18
Other
- Color options
- White
Compiled from manufacturer documentation and user contributions, corrected on an ongoing basis. Spotted something wrong? Tell us.
Rider Reviews
Common questions
What is the engine size of the ATK 604 MX?
The 1991 ATK 604 MX has a Capacity of 562.0 ccm (34.30 cubic inches).
What engine power does the ATK 604 MX have?
The 1991 ATK 604 MX has a Power of 40.0 HP (29.4 kW).
How many gears does the ATK 604 MX have?
The 1991 ATK 604 MX has a Gearbox of 5-speed.
How much does the ATK 604 MX weigh?
The 1991 ATK 604 MX has a Dry weight of 122.9 kg (270.9 pounds).
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