2003 Kawasaki 1100 STX D.I. Jet Ski Factory Service Manual, Page 269Get this manual
15-2 STORAGE Preparation for Storage
During the winter, or whenever the watercraft will not be in use for long period of time, proper storage is essentialIt consists of checking and replacing missing or worn parts; lubricating parts to ensure that they do not become rusted; and, in general, preparing the watercraft so that when the time comes to use it again, it will be in top condition
Cooling System
Clean the cooling system (see Cooling System Flushing in the Cooling and Bilge Systems chapter)Bilge System
the bilge system in the Cooling and CleanSystems chapter)see Bilge System Flushinghoses to the plastic Bilge Before reconnecting the breather fitting, blow air through both hoses [A] to force all water out of the bilge system