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    1977 55hp Johnson idle timing....

    Still working on my idle issues and still believe there is an issue with the carbs but wanted to go through some basic tuning. Bought a service manual to help me troubleshoot from square one. I reset all the carb linkages by the book and it certainly helped. But then I went to set the low...
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    Replacing 1977 55hp carbs with 1976 55hp carbs w/ adj idle screws

    After all the struggles with my 1977 55hp Johnson, all my troubleshooting still points back to carb damage from whomever tried to rebuild it before I owned it. The secondary issue could very well be deteriorated hoses. I cannot find replacement carbs for this with the fixed idle orifice, so I...
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    Had to try AV100LL and see for myself…..

    I’ve previously posted about the issues I was having with poor idle performance for trolling. My ’77 55hp Johnson ran super smooth at 1000+ rpm, but had the hippy hippy shakes increasingly worse as I slowed below 1000 rpm. I was running 89 octane non-ethanol mogas mixed 50:1 with std evinrude...
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    Finding an alternative spark plug....

    Trying to find other alternatives to Champion's L77JC4. I can find the same standard plug style, but not in any improved electrode design or how to determine different heat ranges. Reading some of the archives here on this forum, it might be advantageous to use a hotter plug for trolling.
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    carb conversions?

    I have a 77 Johnson 55hp (55EL77D). The boat is new to me and the motor was rebuilt 10 - 15 years ago (maybe 60 to 100 hours on it so far). The thing is that according to everything I have read, the carb numbers do not match and the original carbs are no longer available. I believe it...
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