The YZ125 has an aluminum frame like its bigger YZ brothers, and the suspension is fully adjustable with a speed-sensitive fork. While the ergonomics are contemporary, the YZ125 lacks the handlebar and footpeg adjustability some bigger bikes offer. A carburetor instead of fuel injection means owning a YZ125 requires some tuning skills. Otherwise, care and feeding are easy. Best of all, though, the YZ125 weighs just 207 pounds fully fueled with premix, giving it almost a downhill mountain-bike feel compared to contemporary 250cc and 450cc MX mounts.