2012 Yamaha Big Bear 400 4x4 IRS, 2012 Yamaha Big Bear 400 4x4 IRS The name of this Yamaha ATV is the Big Bear 400 and it’s as imposing as its name suggests, and it also provides a lot of useful features for hard core ATV riders.Aesthetically, the ATV has flat-style handlebars that help provide light steering effort and great rider comfort while the large front and rear fenders offer excellent mud and splash protection. The ATV also has a water-resistant, large-capacity underseat storage box; a specially designed, thickly padded seat for rider comfort; rugged, serrated footrests that have excellent grip; and a huge set of 25" ITP Mud Lite tires.Growling inside the Big Bear 400’s special compact frame design is a simple yet powerful 386cc air and oil-cooled, SOHC engine that breathes through a heated, semi-oval slide 33 mm BSR Mikuni carburetor, providing seamless throttle response and excellent all-weather performance. The engine is mated to a constant-mesh five-speed transmission that comes with an automatic clutch, a reverse gear, and a super-low stump-pulling first gear. Complimenting the ATV’s sturdy steel frame is an independent rear suspension that offers maximum ground clearance, excellent terrainability, and all-day comfort riders require for their vehicle. The ATV also has a sealed wet brake out back to provide impressive stopping power even in tough conditions.One prominent feature of the Big Bear 400 is its class-exclusive, three-position On-Command In/Out 4WD feature which lets you switch between different sorts of drive systems, including 2WD, limited-slip 4WD, and fully locked differential 4WD, all by just a simple push of a button.