Repeat after us: power-to-weight ratio. The all-new YZ125 is 10 pounds lighter, making it the ultimate in power-to-weight in the 125 class. This pure-bred, intense, hard-charging super-lightweight animal is here to kick some tail. Start with a more powerful and compact six-speed engine that's four pounds lighter. It fits neatly into the new aluminum frame/swingarm that takes another five pounds off the bike while retaining the proven geometry and excellent handling YZs are famous for. Then there's the new 48mm fork and the improved, anti-bottoming shock, linkage and rigid new swingarm mounting - to better deal with the punishment only youthful exuberance unleashed upon a motocross track can dish out. Also new for 2005, a Renthal aluminum handlebar shaves more weight, cuts vibes, and looks sweet along with new magnesium clutch cover and titanium footpegs. The instant-reacting YZ125 is not playing, and casual riding is not its strong suit. This one's built to race, to ride hard and to aim at the top of the podium. Keep it on the pipe and claim your reward: an unmatchable combination of power and lightness that no other 125 will match.