The Suzuki QuadSport Z400 continues dominate the sport ATV category, both in the showroom and on the track. 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.
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 11.2:1 compression ratio. Fuel is fed through 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 phosphorussilicon- 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.
A manual five-speed transmission (with reverse gear) transmits
horsepower to the wheels. A handy knob on the front left fender releases the reverse interlock to select reverse gear with final drive transmitted through an O-ring sealed roller chain. Suzuki's own Start-In-Gear System allows the engine to be started in any gear when the left brake lever is applied.
The QuadSport Z400 starts with a lightweight, rigid, high-tensile-steel-alloy tube frame and sub-frame. An independent double-wishbone front suspension system provides 215mm (8.5 inches) of travel. Out back, an aluminum-alloy swingarm utilizes a fully adjustable piggyback reservoir shock with 230mm (9.1 inches) of wheel travel.
A high-impact skid plate is standard equipment as are durable, serrated-steel footpegs. Wheelbase measures 1245mm (49 inches) with a full 265mm (10.4 inches) of ground clearance. Rolling stock consists of aluminum-alloy wheels shod with Dunlop radial tires for maximum traction and performance.
The Z400's T-shaped seat is narrow at the front and flares out over the rear fenders, allowing the rider to comfortably shift weight back and forth and side to side. Seat height is set at 810mm (31.9 inches) and smoothly transitions to the bodywork and lightweight 10-liter (2.65-gallon) fuel tank. A multi-reflector taillight mounted at the rear completes the QuadSport Z400.
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