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how can I get more cooling water to pump through my yamaha 9.9?

the 1999 yamaha 9.9 engine used to have a steady stream of cooling water coming out of the engine, now its only a dribble. What has happened, what do I do now?
phelps mcilvaine, July 2008
Get an impeller replacement kit and replace the impeller and ware plate.

Captain Mark, July 2008
check pump impeller for corrosion.flush cooling system.

caine, July 2008
link Click here to see other fixes for Yamaha.