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    HELP!! 77 Evinrude 70hp misfire

    Definitely a carb problem. I do think there might be 2 weaker coils, but Definitely getting spark. I filled up the 3 fuel lines to the carbs with carb cleaner, ran it, and then opened up the bowl and flushed them out. Seems to have made a difference. I'm gonna take her out Thursday and see what...
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    HELP!! 77 Evinrude 70hp misfire

    I don't disagree, I'm not familiar with boat motors at all. My question about the diaphragm was a serious question too.
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    HELP!! 77 Evinrude 70hp misfire

    Well I can't really afford to rebuild it. I've had carbs rebuilt professionally, put new plugs in, then replaced again with lower resistance plugs, added an inline filter, cleaned the fuel tank and replaced fuel.
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    HELP!! 77 Evinrude 70hp misfire

    Diaphragm has been replaced as well. Before I bought it. If the Diaphragm was bad, wouldn't it not get enough fuel? If I tap the choke with the engine running, it dies. The air box is pretty wet, I haven't pulled it off and ran it to see which carb yet.
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    HELP!! 77 Evinrude 70hp misfire

    I know it's not water in fuel, checked that. Compression is 100 psi in all 3 cylinders. Ill check with a timing light, but I'm almost positive it's getting too much fuel. Unsure how to adjust that. I added an inline filter too, but no help. Last year it ran rough too, but not nearly as bad
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    HELP!! 77 Evinrude 70hp misfire

    I have a 77 evinrude 70hp that misfires. Mixed 50:1, new plugs, new fuel, and carbs professionally rebuilt and vacuum tested after. It will miss real bad, and ill have to run it at full or close to full acceleration for about 15 min straight before it will clear up. Seems to be getting too much...
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