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    Older 9.9 Honda 4 stroke. No spark. Need wiring diagram and/or know-how

    I picked up 9.9 and it appears the kill switch has been messed with. Other than that, it looks like brand new, but I get no spark when I try to start it
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    Dead cylinder after carb cleaning on 55EL78S

    What does rebuilding high ring damage entail?
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    Dead cylinder after carb cleaning on 55EL78S

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    Dead cylinder after carb cleaning on 55EL78S

    Hey fast bullet, you sounded like the voice of experience, so I borrowed my millwright buddy's digital compression tester (quickly while he is still at work) . If I got 154 psi on the top cyl. & I got 31 psi on the bottom cyl. Would that mean you nailed it from 100s or 1,000s miles away?
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    Dead cylinder after carb cleaning on 55EL78S

    Ok thanks, I'll go check the compression and the spark gap.
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    Dead cylinder after carb cleaning on 55EL78S

    Wow, that's good info. I mean...really bad info,.but good to know
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    Dead cylinder after carb cleaning on 55EL78S

    And...thanks so much for your insights. Im sure I'm close to getting it
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    Dead cylinder after carb cleaning on 55EL78S

    What does his ring pistons mean?
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    Dead cylinder after carb cleaning on 55EL78S

    Yes, Ive run more than a can of carb cleaner thru every port I could find. Including the bottom one, although I didn't know that was the high end jet. Plus blasted it with shop air.
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    Dead cylinder after carb cleaning on 55EL78S

    No, I haven't checked compression. Now that I think about it, that could be the issue. It fires on both when I rev it high, but at lower idle, it doesn't draw enough air to pull fuel. Is that how low compression would effect idle?
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    Dead cylinder after carb cleaning on 55EL78S

    I have an enclosed spark tester,.but it appears to have a decent spark. When I rev it way up, it seems to pick up fuel in the bottom carb. It runs without dying on one cylinder, just not clear down to idle. And if I squirt gas in the bottom carb, it takes off and runs smooth.
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    wiring question 1978 55hp Johnson

    https://maxrules.com/graphics/omc/wiring/77-78_55HP.jpg
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    Dead cylinder after carb cleaning on 55EL78S

    Picked up an old 55EL78S. It would start an run for about 5 seconds. Then die. So I took off the carbs, cleaned them and put them back on. Then it started and ran rough, and poured gas out of the bottom carb. I decided the float was hung up and that was probably flooding out the bottom...
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    wiring question 1978 55hp Johnson

    https://maxrules
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