1972 85 hp V4 bad idle

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    amuller
    US Member - 2 Years
    Replies: 861
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    #178895

    I’ve finally been running this motor (muffs) and it starts readily but won’t idle well. It surges badly, about in the range of 700-1500 rev/min,bangs loudly, I could think there was some cross-firing going on.

    I’ve been through the carbs and ignition carefully (I thought). The idle mixture is fixed, of course, the throttle flaps are synced, and fully closed at idle. There aren’t a lot of adjustments to make aside from the coordination of throttle and timing.

    Can anyone point me in the right direction here?

    Thanks.

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    fleetwin
    US Member - 2 Years
    Replies: 2696
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    #178909

    Is it sneezing/coughing? Don’t really understand your rev/min,bangs loudly description….. Anyway you can post a video of the engine misbehaving, or perhaps a link to a video? I don’t want to point you in the wrong direction, could be anything…..

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    amuller
    US Member - 2 Years
    Replies: 861
    Topics: 136
    #178964

    I’ll do a video as you suggest.

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