Powering each 2005 Kymco Bet & Win scooter is a four-stroke, liquid-cooled, single-cylinder engine, which has two intake valves and is fueled by a carburetor. The engine displaces at 249.1 cubic centimeters, which classifies the Bet & Win as a 250cc scooter and explains the three-digit suffix. It produces 9.4 pound-feet of torque at 5,500 revolutions per minute (RPM), and it has a bore and stroke of 72.7 x 60 millimeters (2.86 x 2.36 inches) and compression ratio of 10.3 to 1. The engine is paired with a Continuously Variable Transmission, which shifts through an unlimited amount of gear ratios to produce a better fuel economy. The fuel tank on each 2005 Bet & Win can hold up to 2.8 gallons (10.5 liters).