ATK 604 MX

Introducing the 1991 ATK 604 MX, a standout in the cross-motocross category that encapsulates the spirit of off-road racing with its robust performance and lightweight design. Designed by the innovative minds at ATK, this motorcycle was positioned to cater to serious motocross enthusiasts who crave high performance and agility on the track. With a history of producing competitive dirt bikes, ATK aimed to deliver a machine that could take on the toughest terrains and the fiercest competitors. The 604 MX is not just a motorcycle; it's a precision tool for those who live for the thrill of the ride. At the heart of the ATK 604 MX is a formidable 562cc single-cylinder, four-stroke engine that produces an impressive 40 horsepower. This powerplant, equipped with a Mikuni TM 38 flat slide carburetor and a CDI electric ignition system, ensures responsive acceleration and peak performance at high RPMs, making it well-suited for the demands of motocross racing. The bike’s compression ratio of 9.8:1, coupled with a well-balanced bore and stroke of 94.0 mm by 81.0 mm, delivers a thrilling ride with excellent torque. Riders can expect a seamless experience through the 5-speed gearbox, allowing for quick shifts and optimal control, whether navigating tight corners or blasting down straightaways. With a lightweight frame tipping the scales at just 122.9 kg (271 pounds), the 604 MX offers superb maneuverability, allowing riders to push limits on any track. The ATK 604 MX is equipped with advanced suspension and braking systems that elevate its performance even further. The front features an adjustable WP USD suspension that provides 300 mm (11.8 inches) of travel, while the rear boasts a WP multi-adjuster shock with 330 mm (13.0 inches) of travel, ensuring exceptional handling and stability, no matter the terrain. The bike is also fitted with a durable nickel-plated heat-treated chromoly frame, which offers both strength and lightness. Braking is handled by a single disc system with 2-piston calipers at the front and a compact disc mounted on the front sprocket at the rear, providing precise stopping power when it counts. With a ground clearance of 343 mm (13.5 inches) and a seat height of 950 mm (37.4 inches), the 604 MX is designed for serious off-road performance while still remaining accessible to riders of various skill levels. **