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250ox66 rpm surge

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  • 250ox66 rpm surge

    I have a 2000 250 hp 0x66 ,at 3800 rpm the engine will jump up to 4300rpms and then back to 3800. it will do this until I change the rpms . I had water pump and thermastats changed and the 02 sensor cleaned last season any ideas?

  • #2
    Check the fuel pressure while running to see if maintaining pressure.
    Regards
    Boats.net
    Yamaha Outboard Parts

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