2000 Yamaha Big Bear 400 4X4, Very clean. Runs Great!!!!! - The perfect blend of taskmaster and adventurer this hard-working sports enthusiast has a compact 400cc air-cooled four-stroke engine, semi-automatic and is an unbelievable value. Built in the USA. The all-new Big Bear 400 4x4 has a new 400cc, air/oil-cooled four-stroke engine. With 50cc more grunt than last year, a dry weight of just 557 pounds, an extremely tight turning radius, and long-travel, preload-adjustable suspension at both ends all add up to superior power-to-weight with outstanding agility, handling and comfort -- ideal for maneuvering out of tight spots or working with heavy equipment.