In 2003, the YZF received its biggest update in its history. First, the engine displacement was increased to 449 cc, producing over 52 horsepower, in compliance to the new AMA Motocross maximum displacement rule. Next, the frame and plastic were all updated for a new, sleeker look. Additionally, the YZ's weight was engineered from its original 250 pounds down to 233 pounds. The YZF has a 4-speed transmission. This bike makes tremendous power. , , If you are looking for massive power and great handling than the YZF is what you are looking for. This is a great bike for the track, you won't be disappointed with the power or handling. All at a great low and affordable price.