2003-2005 Kawasaki JetSki Ultra-150 Factory Service Manual, Page 41Get this manual
2-12 PERIODIC MAINTENANCE Periodic Maintenance Procedure Cooling and Bilge System
Cooling System Flushing
To prevent sand or salt deposits from accumulating in the cooling system, it must be flushed occasionallyFlush the system according to the Periodic Maintenance Chart, after each use in salt water, or whenever there is reduced water flow from the bypass outlet on the left side of the hullRemove the fitting cap [A] on the cylinder headConnect garden hose [B] to the fitting