Bombardier SeaDoo 1990 factory shop manual, Page 174Get this manual
Section 11 STORAGE
STORAGE
It is during winter or when the watercraft is not to be in use for prolonged time that proper storage is necessity Storage during long period of inactivity consist of checking and replacing missing, broken or worn parts Proper lubrication and treatment should be performed to insure thatparts do not become corroded and in general, preparing The watercraft so that when the time comes to use it again, it will be in top condition
PROPULSION SYSTEM
Drain lubricant in impeller shaft reservoir Clean with solvent then refill with 65( US ozl of Sea-Doo synL thetic oil293 600 011)
ENGINE DRAINIING
Check engine drain tube running from engine water inlet socket to exhaust outlet socket Make sure there is no sand or other particles and it is not obstructed so that water can leave the engineClean tube and fitting (on exhaust outlet) as necessary