But never mind the list of technical features, what matters is how the new KX450F performs on the racetrack. And to find that out, Kawasaki invited the moto-press to world-renowned Red Bud in southern Michigan, which hosts an AMA national each July 4th weekend. The challenging track was deeply prepped with power-robbing loam and steep climbs, but the KX was more than up to the task. With the standard coupler, the power was snappy and aggressive yet controllable. With the hard coupler installed the rear tire felt more connected to the track, and acceleration out of turns was excellent. Revving the bike, the boost was plentiful, but not brutal. With the soft coupler plugged in the bottom wasn't as smooth and connected, but the engine boosted hard in the middle and pulled like crazy on top.