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15hp suzuki rough running at high rpm

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  • 15hp suzuki rough running at high rpm

    A friend of mine has an early 2000s 15hp 4 stroke suzuki that runs pretty rough when it's on plane and the water coming out of the telltale is almost boiling hot. The motor is definitely not enough power for the boat it's on but I can't imagine that would have anything to do with it acting like it is, the water pressure is great and the impeller is new but it stays hot at all RPMs. Please help

  • #2
    Re: 15hp suzuki rough running at high rpm

    have you though about the thermostat?
    But pushing a motor too hard and not propping it correctly is bad

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    • #3
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      Re: 15hp suzuki rough running at high rpm

      The boat it's on is a 14 foot fiberglass skiff but it's pretty heavy so I guess could stress it out but would it be enough to make the water near boiling.

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