The "original" Jet Ski Bible, written by David Simon This is a straight forward high performance guide for the Kawasaki 44, 550, 650. Also included is the WATCON 2-stroke technology manual. This is a MUST have book for building maintaining, or owning a high performance personal water craft. This manual features David Simons "the understanding of air flow". It goes into structural limitations and factors, crank case design, crank shaft design, cylinder and port design, cylinder head design, exhaust systems and water box design, intake systems, and tuning an engine as a whole. Two great books for the price of one! Part number # JSB-02