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Yamaha 15hp 2 stroke

Dave asked on 7/2/2019 9:23:42 PM
I recently changed my impeller on 15hp as it was worn and not pumping water well. My repair seemed to have gone well except that I still have a “hollow” sound when Reving the engine, despite pumping water, similar to the sound made when running an outboard without water flow.

Any ideas what might be causing this sound?

 

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