Question about Yamaha 12V Air Pump

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Loss of speed

Jet ski only runs at 12 mph No problems starting or reversing. changed impeller, spark plugs, and air filter still having the same issue.

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  • griffin3406 Jul 08, 2009

    2003 Yamaha FX140
    The engine doesn't rev it just doesn't want to go any faster than 24 mph. We changed the gas also and that's when it went from 12 mph to 24 mph but hasn't improved speed since. Starts great and runs fine.

  • thomas foster
    thomas foster May 11, 2010

    what kind of ski and does the engine rev like it wants to go but doesnt?

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If you got to this page and look up your model it will tell you the standard settings for your high and low speed jets. Resetting back to stock settings may perk your boat back up.
http://www.shopsbt.com/forum/showthread.php?t=13981

Posted on Sep 09, 2010

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Try having the carbs cleaned.

Posted on Sep 21, 2009

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