2021 KAWASAKI Vulcan S, 2021 KAWASAKI Vulcan S Easy-to-control 649cc liquid-cooled, 4-stroke Parallel Twin with Cleaner Emissions Liquid-cooled, DOHC, 8-valve 649cc Parallel Twin with fuel injection delivers smooth, responsive performance, especially in the low and medium rpm ranges. The engine was tuned for rider-friendly power characteristics that will inspire confidence in new riders. The Vu...