Re: ’73 18hp OMC will not idle

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August 14, 2017 at 1:16 pm #63072
lindy46
Participant

    Could be an unseen crack in the carb casting. I had a 5.5hp Johnson did the same thing and NOTHING I did would make it idle properly. I think my slow speed needle was out 1 to as much as 4-5 turns and coudn’t get any consistency. Finally replaced the carb and she purred like a kitten.