Kawasaki's Zephyr χ, the Only Air-Cooled DOHC Four to Get 4 Valves, Reaches 53 Horsepower

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Kawasaki's Zephyr χ, produced from 1996 to 2009, is getting renewed attention as the only air-cooled DOHC four-cylinder in Kawasaki's lineup to receive a four-valve-per-cylinder conversion. Nearly everything from the crankshaft up was redesigned, lifting output from 46 to 53 horsepower at 11,000rpm, while keeping its traditional styling intact.