The Scrambler 400 2x4 uses the Polaris-exclusive Concentric Drive System (CDS), which aligns the swing arm’s pivot point with the center of the drive sprocket. The rear suspension is not affected by engine torque, so a Scrambler 400 2x4 rider enjoys the full 10.5 inches of rear suspension travel. The Polaris CDS design also results in a consistent chain tension, reducing chain wear and decreasing considerably the need for chain adjustment or maintenance. 

The Polaris 400 engine is a 2-stroke, liquid-cooled powerplant with a 34mm Mikuni carburetor, oil injection, and CD ignition. Its power is delivered to the drive wheels consistently, as conditions warrant, thanks to the automatic PVT (Polaris Variable Transmission). This dual-sensing transmission responds to engine RPM and vehicle torque load, and reacts quickly and efficiently to changes in off-road conditions. E-Z Shift lets a rider conveniently select between forward and reverse. 

The long-travel MacPherson strut front suspension has 8.2 inches of travel, and gives the Scrambler 400 2x4 a turning radius of 60 inches. Stopping power is provided by single-lever, all­wheel hydraulic disc brakes and a hydraulic rear foot brake. 

The Scrambler 400 2x4 has full floorboards, a quartz halogen headlight, brake light, neutral and reverse indicator lights, and a 4-gallon fuel tank.