Charging Flywheels are a mainstay of the performance market, pioneered, patented, and made famous by Jetinetics. These are the world's finest, billet CNC machined, balanced, and best engineered flywheels in the world, period. Used by top pro riders in closed course and surf, these are lighter, stronger, and add incredible throttle response to any engine combo. Bolt-on easy and highly reliable, experience why these are the choice of champions worldwide. The 0304 is designed to fit your Kawasaki 650 PWC, it's universal for all 650 Kaw. engines.