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  1. #1

    Join Date
    Jul 2012
    Northern VA

    97 720 motor......starts and idles but has a harsh vibration to it.....any ideas??

    compression is 129/130......when you rev it the motor shakes alot.....not really hearing a clacking sound like a busted rod and motor mounts are not broke....any idea what could cause this??? Gonna pull the motor anyway but wondered if anybody has experienced something similar.

  2. #2
    Myself's Avatar
    Join Date
    May 2007
    North Central Arkansas
    The 720 is a shaker to begin with. Add maybe some dirty or mis-adjusted carbs and it gets much worse.

  3. #3
    does it get better or worse when you apply throttle?

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