On the track, the YZ450F engine is both powerful and aggressive with heaps of bottom-end power, a strong midrange, and decent top-end. The engine’s ability to pull down low makes it easy to ride a gear high and lug it down low in the rpm. The new 49-tooth sprocket makes the bike a corner-exit weapon, but the bike revs out quickly. The Power Tuner app, with its multiple preprogrammed maps, helped counteract those tendencies, allowing us to choose a tune with more torque that gave the bike longer legs. The app also gives the rider the ability to create fuel and ignition timing changes with their phone and then upload them to the bike via the onboard Wi-Fi system. The clutch is very consistent with almost no fade, and the transmission shifts smoothly with minimal clutch input. There is some airbox noise, and the muffler isn’t the quietest of the bikes gathered here either, but we grew accustomed to both after a few quick laps.