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Recently named the ATV of the year by "4-wheel ATV Action Magazine," the Suzuki QuadSport Z400 continues to dominate the sport ATV marketplace. The Z400 features an advanced four-stroke powerplant, state-of-the art chassis and suspension components and a slick-shifting five -speed transmission all combined in a powerful, nimble and lightweight package. The year 2004 brings the addition of a new detachable rear grabrail, an easy-to-use drive chain-adjustment system, retuned exhaust sound, and an RM-inspired graphics package for an aggressive look.

Powering the QuadSport Z400 is a high-performance 398cc liquid-cooled, DOHC, single-cylinder four-stroke engine. Its bore and stroke measure 90.0mm x 62.6mm. Four valves are actuated by cam lobes riding directly on bucket tappets. The cylinder head features a narrow 28-degree included valve angle for a compact, efficient combustion chamber with an 11.3:1 compression ratio. Fuel is supplied by a 36mm Mikuni carburetor feeding 36mm intake valves, with exhaust leaving through 29mm valves. A dry sump lubrication system contributes to the more compact engine package.

The aluminum-alloy cylinder is plated with Suzuki's own race-proven nickel phosphorus-silicon-carbide coating, known as SCEM (Suzuki Composite Electrochemical Material), for reduced weight and improved heat transfer, allowing for tighter and more efficient piston-to-cylinder clearance. Additionally, the piston is forged aluminum-alloy for even more weight savings. A counter-balancer shaft reduces vibration, while an automatic cam chain tensioner and an electronic CDI ignition simplify maintenance duties. Engineered for fun.