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F40 2004 - Backfire through carbs

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  • F40 2004 - Backfire through carbs

    I have my F40 up on a stand and when I run it with the earmuffs it idles fine but when I move the throttle it doesn't rev up but backfires through one of the carbs. How do I fix this?

  • #2
    Probably dirty carbs, may need to be cleaned and sycn.
    Regards
    Boats.net
    Yamaha Outboard Parts

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