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My Mercury outboard Model #402 has no spark. - Boating

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Scariest ignition merc ever made. it controls the spark by running the high voltage through a pair of points. Needless to say these points almost immediately burn to a crisp, but merc says just run em- they'll be fine.

So- they are located under the flywheel which requires a special puller like a big motorcycle puller to get the flywheel off.

READ- take it to the dealer. at least you don't own a 400.

Posted on Nov 29, 2012

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Posted on Jan 02, 2017

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GetMeOttaHere

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SOURCE: 2000 Mercury 75 outboard 3 cylinder with 3

No spark can be attributed to two components; The stator or the trigger assembly. Even if you had a diagram (available online @ Mercury), you will still need a test harness,a DVA adapter and a meter to measure the resistance of the CDM's (capacitor discharge module) ,stator and trigger assembly. Best case fix would be the trigger, most expensive would be the stator. If you remove the flywheel, and inspect the stator, you can inspect the the coils that are coated with a white epoxy, and if one or more are bad, they sometimes leak a black resin, indicating the coil(s) have been shorted and no longer provide voltage for spark.

Posted on Jan 22, 2011

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