Bombardier SeaDoo 1990 factory shop manual, Page 71Get this manual
Section 04 COOLING SYSTEM Sub-Section 03 (CAREFLUSHING)
1 When servicing hulljet pump, always rotate watercraft counterclockwise (seen from the rear)IRotating watercraft clockwise could allow residual water tuned pipe to enter the engine and cause damage
6Check overheat beeper operation by jumping terminal of thermosensor wire to groundBeeper must operateNOTETether cord cap must be over its switch so that beeper works
FLUSHING
When the watercraft is operated in unclean water and particularly in salt water, flushing of cooling system is necessaryCAUTIOINFailure perform coolling system flushing, when watercraft is used in salt water, will result in damage watercraft componentst Since the watercraft uses the same water where it sails, for propulsion and cooling systems, this water flows everywhere in water pcketsIf the watercraft is being used in salt water and cooling system is not regularly flushed, salt will eventually corrode componentsInfiltration in cooling system of any particle present in the water is unavoidableDeposit accumulation can clog cooling system and lead engine to severe damageFlushing is necessary when the watercraft is operated in :