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Results 1 to 4 of 4
  1. #1

    Default 1977 mercury 4hp 2 stroke starts but cuts out

    hi i need help my engine will start for 3 seconds then stops, can any one help do i need to alter carb? spark plugs ok fuel is clean... please help

  2. #2

    Default Re: 1977 mercury 4hp 2 stroke starts but cuts out

    hi there i have same problem (above thread) all my fuel is clean i cleaned the carb and evan has fuel (small amount) coming out of carb air intake mine will only start at wide open throttle and then die after 2-3seconds.. I know this isnt much help but your not the only one..

    regards tom

  3. #3
    Join Date
    May 2007
    Ireland,the only country in the world you can go North to go South

    Default Re: 1977 mercury 4hp 2 stroke starts but cuts out

    There is a difference between both outboards, Tom's carb, , going by the pic Tom posted, , robmcc85's carb .
    Clean the carb,blow out all the passage ways,seat the idle screw,back it out 1 1/2 turns,then keep backing it out 'til you get it to idle,then do as guyjg says on Tom's post
    If buying parts,try and get them here on as it helps keep the forum up and running.
    Last edited by haventaclue; 08-17-2011 at 06:41 PM.

  4. #4

    Default Re: 1977 mercury 4hp 2 stroke starts but cuts out

    thanks tom ,haventaclue, will try and clean carb out and keep you informed

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