The number “650” stands for the engine displacement of the motorcycle, which is measured at 652 cubic centimeters (rounded down to 650). The engine itself is a four-stroke, single-cylinder unit, with an air cooler to maintain a temperature ideal for operation. Its bore and stroke is measured at 3.7 by 3.7 inches (94 by 94 millimeters), and its compression ratio is 8.5 to 1. Suzuki provides a 40-mm Mikuni carburetor for admitting fuel to the engine, and the rider can start the bike using its electric ignition. Each 2004 Suzuki Savage engine is paired with a five-speed manual gearbox, and the bike has a 2.8-gallon (11-liter) gas tank.