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30HP with self adjusting idle

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  • 30HP with self adjusting idle

    I'm working on a 30HP that starts easily and idles great at about 1000RPM. If it just sits there running, the idle will slowly start to climb to nearly 2200RPM. The idle screw is all the way out, the carbs have been cleaned, pilot screws to 1 3/4 turns and head reworked and valves adjusted. Once I let the engine cool back off to totally cold, it will idle slow and slowly start to climb again. The engine revs OK but I can't figure why the creeping idle. It's around a 2009 model.

  • #2
    Probably have an air leak in intake manifold, check gaskets.
    Regards
    Boats.net
    Honda Outboard Parts

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