1996-2002 Kawasaki 1100ZXi Jet Ski Factory Service Manual., Page 97Get this manual
8-6 COOLING AND BILGE SYSTEMS
Connec the bilge fitter hose (from the hull bottom) to the garden hoses, turn the water on, and flush it out for about minuteDuring this procedure, water will flow into the engine compartmentDo not allow large amount of water to accumulate in the engine compartmentConnec the other hoses (from the hull bulkhead) to the garden hose, turn the water on, and flush it out for several minutes