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  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, http://www.crowleymarine.com/mercury...arts/456_5.cfm , going by the pic Tom posted, http://www.crowleymarine.com/mercury...arts/472_6.cfm , 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 http://www.marineengine.com/ as it helps keep the forum up and running.
    Last edited by haventaclue; 08-17-2011 at 05:41 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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