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40hp 1987 yamaha outboard motor will run for 30-60

40hp 1987 yamaha outboard 2 stroke motor will run for 30-60 seconds at full throttle before sputtering then stalling out. I have replaced the main fuel line from tank to motor but problem persists. The motor starts fine and no problems while idle or even 50% throttle.

Posted by duchinsky88 on

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  • Anonymous Mar 17, 2014

    i have a 30 hp 1996 tahatsu 2 stroke electric start that is not charging the battery. It starts fine when battery is charged or you use pull start.

  • Anonymous Mar 17, 2014

    i have a 30 hp 1996 tahatsu 2 stroke electric start that is not charging the battery. It starts fine when battery is charged or you use pull start.

  • Anonymous Mar 17, 2014

    have tried replacing some wires

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Mark L. Roberts Jr.

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Sound like the fuel pump is not keeping up with the engine's demand. Check it out. Good luck. Hope this helps.

Posted on Apr 27, 2009

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Foxxracer19

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My 92' evinrude 40hp outboard motor will not run more than half speed even though i have it at full throttle whats wrong?

Posted on May 07, 2013

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Stephan manney

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If not might be powerhead bearing.When heated up or wound bearing will slip and cause spark issues.....

Posted on Dec 26, 2012

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