Reply To: Diagnosing no spark issue on 1992 mercury 8 hp. 2 cycle

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April 21, 2024 at 11:37 am #287154
CHUCK
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    Hi,

    I’m not a Mercury trained tech but I was working on a 1981 25HP Mercury the other day and it appears to have an ignition system essentially the same as your 8HP.

    Since you have no spark on either cylinder….I would feel that you can rule out the coils.  It would be unlikely that both of them have failed.

    I have attached some data.  Also the CDI troubleshooting PDF for the Stator.

    Most of the tests require only a VOM;  the stator voltage tests are harder to do unless you have a test tank and can run the engine at WOT with a DVM attached.

    As Michael stated above…..the very first thing you want to do is disconnect the kill switch at the switchbox.  That could very well be the problem.