Bombardier SeaDoo 1989 factory shop manual, Page 69Get this manual
Section 04 COOLING SYSTEM Sub-section 03 (CAREFLUSHING)
NOTEallow more efficient flushing on watercraft equipped with filush kit, install hose pincer295 000 076) between T-fitting and exhalust socket This will prevent water exiting through exhaust socket
3 Start the engine then immediately open the water tap
CAUTION ;Always start the engine before openilng the water tapOtherwise, Walter willl back flow through the tuned pipe into the engine and may cause damage internal partsOpen water tapimmediately after engine is started prevent overheatingFollow this procedure exactly4Run the engine albout minutes fast idle