2003-2005 Kawasaki JetSki Ultra-150 Factory Service Manual, Page 271Get 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
the cooling system (see Cooling Clean Periodic Maintenance chapter)System Flushing in the
Bilge System
bilge system (see Bilge System Flushing in Clean theMaintenance chapter)Before reconnecting the Periodic the hoses to the plastic breather fitting, blow air through both hoses [A] to force all water out of the bilge system