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  1. B

    cowl air inlet on mercury 9.9.

    I have changed the plug wires but I don't know when I'll get out again to test it.
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    cowl air inlet on mercury 9.9.

    I've already planned to replace the plug wires but I doubt they are the issue. they are not touching and the cowl is non-conducting.
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    cowl air inlet on mercury 9.9.

    Well, it's better but still distinctly different when the cowl is on. The video with the cowl on is edited to repeat because the instant you start recording it stops doing its trick for a few seconds. The repetition rate in the editing video is about what it actually did most of the time. I'm...
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    cowl air inlet on mercury 9.9.

    I think I might have got it. I noticed exhaust coming out the shift shaft hole while running it in a tub. That exhaust is shooting up directly at the opening in the cowl and choking the carb. I read the manual again and realized I left off the RTV the second time I replaced the water pump...
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    cowl air inlet on mercury 9.9.

    it's a 25 year old motor (new to me). I can't imagine it did this its whole life.
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    cowl air inlet on mercury 9.9.

    I know. There is nothing touching the cowl at all. I think it has to be air/exhaust related.
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    cowl air inlet on mercury 9.9.

    I tried that and it had little or no effect. it should be getting plenty or air now. I also pulled the exhaust plate and that gasket is in perfect shape. no exhaust leaks there.
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    cowl air inlet on mercury 9.9.

    Yes, it does. That's why I'm so confused.
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    cowl air inlet on mercury 9.9.

    oddly, yes it does.
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    cowl air inlet on mercury 9.9.

    It does have CDI but why only when the cowl is on.
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    cowl air inlet on mercury 9.9.

    Fuel pump and carb rebuilt. New plugs. Cowl doesn't touch anything when on.
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    cowl air inlet on mercury 9.9.

    Yes, I knew that. I replaced the gasket from the powerhead to the adapter plate and the gasket from the adapter plate to the mid-section. Still acts the same. I'm running out of ideas but I'm gonna change out the plug wires as they get close to the cowl. they are probably 20 years old.
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    cowl air inlet on mercury 9.9.

    Great minds think alike - I took out the grab handle insert and now I've got a huge inlet. I'm still confused as to why there is none to begin with but that's a reasonable solution. However, that had no impact on the boat running poorly at WOT with the cowl on.
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    cowl air inlet on mercury 9.9.

    As shown in the pics, the grab handle is completely sealed. That's why I'm confused.
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    cowl air inlet on mercury 9.9.

    It runs poory at WOT with the cowl on. It runs smoother and goes faster with it off. I have read that can be caused by an exhaust leak so I just pulled the powerhead and replaced the exhaust gasket. TBD if it helps. The cowl is completely sealed at the grab handle by the part shown in the...
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    cowl air inlet on mercury 9.9.

    Sorry, typo 1999 9.9, serial number OG889354
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    cowl air inlet on mercury 9.9.

    The lift handle is sealed.
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    cowl air inlet on mercury 9.9.

    I've got a 1979 9.9 2 stroke and I don't see where the air inlet into the cowl is. The top cowl is completely sealed and the only gap in the lower cowl is a finder width opening around the shift shaft. It doesn't look very big. Am I missing something obvious?
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    question on the starting a "2 cycle Merc" sticky

    That is exactly what I've done and it works great. I was just hoping to find replacement harnesses that would let me use the stock connector location and style. The new wires snaking out the front of the motor housing look a little amateur.
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    question on the starting a "2 cycle Merc" sticky

    Every single wire on both harnesses is like that right up to the connector. Nothing left to splice too.
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