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2003 150hp high speed miss

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  • 2003 150hp high speed miss

    I developed a full throttle miss well, more than a miss it felt like half the cylinders quit and at the same time my overheating alarm came on. I shut off immediately waited about a minute started back up and it ran fine for 5 minutes and did it again. This time after shutting off I started right back up with no issues but left RPM at 4000 and again it happened soon after. I repeated the same steps but did not get over 3500 RPM and made it the remaining 15 miles to the dock. Fuel is fresh, filter is clean, vent tube on tank is clear, the spark plugs all looked the same by the time I got in. Seems like more than just one carb problem but anyone have any ideas? Thanks in advance!

  • #2
    If it is overheating then need to repair water pump. Run a compression test to see if any overheat damage to engine. Could be a carb problem, may need to clean carbs.
    Regards
    Boats.net
    Johnson Outboard Parts

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