Question about Yamaha 12V Air Pump

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Loss of speed. ..upon acceleration over approx 25/30

Yamaha wave runner..bogs down after it accelerates...revs up, but loses speed...

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  • jantieau Jul 12, 2009

    unit has always run well..in the past..what is the problem?? anybody

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If you are achieving proper max RPM but not achieving peak MPH, the prop is cavatating. That means it is aerating the water around the impeller. The most common cause of this is debris (rope, weeds) wrapped around the prop shaft. With the lanyard key in your pocket, look up the intake screen for the jet pump and see what is wrapped around the prop shaft. Once you remove that, your MPH should be right back to where it was.

Posted on Sep 23, 2009

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Posted on Jan 02, 2017

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