ATK 604 MX: history, specs, pictures

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ATK 604 MX
Production 1991
single cylinder, four-stroke
Bore / Stroke 94.0mm x 81.0mm
Fuel System carburetor. mikuni tm 38 flat slide
Ignition cdi - electric advancing system
Transmission Gear box: 5-speed

Final Drive: chain

Clutch: wet plate
Suspension Front: wp adjustable usd
Rear: wp multi-adjuster shock (linkless)
Brakes Front: single disc. 2-piston calipers
Rear: single disc. disk mounted on front-sprocket . 1 piston caliper
Front Tire 80/100-21
Rear Tire 120/90-18
Wheelbase 57.99 inches (1473 mm)
Length 57.99 inches (1473 mm)
Width 33.86 inches (860 mm)
Seat Height 37.4 inches (950 mm)
Weight 270.95 pounds (122.9 Kg) (dry),
Oil Capacity 0.61 Gallon (2.30 Liters)
Fuel Capacity 4.6 Gallon (17.41 Liters)
Manuals Service Manual

The ATK 604 MX was a single cylinder, four-stroke standard produced by ATK in 1991.

Engine[edit | edit source]

The engine was a air cooled single cylinder, four-stroke. A 94.0mm bore x 81.0mm stroke result in a displacement of just 562.0 cubic centimeters. Fuel was supplied via a double overhead cams/twin cam (dohc).

Drive[edit | edit source]

The bike has a 5-speed transmission. Power was moderated via the wet plate.

Chassis[edit | edit source]

It came with a 80/100-21 front tire and a 120/90-18 rear tire. Stopping was achieved via single disc. 2-piston calipers in the front and a single disc. disk mounted on front-sprocket . 1 piston caliper in the rear. The front suspension was a wp adjustable usd while the rear was equipped with a wp multi-adjuster shock (linkless). The 604 MX was fitted with a 4.6 Gallon (17.41 Liters) fuel tank. The bike weighed just 270.95 pounds (122.9 Kg). The wheelbase was 57.99 inches (1473 mm) long.