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2000 150 OX66 power loss

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  • 2000 150 OX66 power loss

    when I first run my engine, it operates fine.
    After a few minutes, it has a loss of power.
    I ran fuel from an external tank to rule out fuel/tank/filter issues.
    I cleaned the engine mounted fuel filter.
    It act as if it is being starved for fuel.
    Surging and dropping RPMs.
    It operates to 1300 RPMs fine. Idles fine.

    Could it be a waterpump maybe not cooling properly, and causing the engine to operate in a "safe" mode??
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