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Old 17 October 2008, 12:47   #1
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Country: UK - England
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Mercury 25hp 2 Stroke one spark only

Does any one know:

I have a 25hp 1988 2 stroke, the engine only sparks on one cylinder?

I have changed the plug and coil , one has a good fat spark one has nothing?

Is the switvh box a possible fault, or would both not plugs not spark.

Has anyone got a switch box for this engine, I can buy or borrow to try it?

Any help greatly appreciated.
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Old 17 October 2008, 18:14   #2
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Could you post pics of both engine sides to see CD unit and plug coils and to look for a compatible engine type ?
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Old 17 October 2008, 18:55   #3
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Is the HT lead ok?
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Old 18 October 2008, 09:30   #4
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HT and Coil swapped with spares ones I had........

I have checked the earth of both coils, is there on sensor per coil or two from the flywheel?

I would have thought CDI would work or not ........... can believ one side is ok one isnt?

Any more thoughts?
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Old 18 October 2008, 09:38   #5
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Take the coil lead and plug from the side that is working OK and fit it the other side , that will at least rule out the chance of a second faulty coil lead or plug.
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