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Mariner 90hp/no spark on bottom cylinder

Discussion Forum at MarineEngine.com » Mercury Mariner Outboard » Archive through July 09, 2009 » Mariner 90hp/no spark on bottom cylinder « Previous Next »

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Darrel Fagerland
New member
Username: dfagerland

Post Number: 2
Registered: 06-2009
Posted on Wednesday, July 08, 2009 - 09:18 pm:   Edit Post Delete Post View Post/Check IP

I have a mariner 90 hp with no spark on bottom cylinder. I put on a new coil but didn't help. Is there a set of points for each cylinder or an electronic module?
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Graham Lamb
Senior Member
Username: galamb

Post Number: 5585
Registered: 05-2007


Posted on Wednesday, July 08, 2009 - 09:45 pm:   Edit Post Delete Post View Post/Check IP

No points, this has a Thunderbolt 4 ignition.

If the coil isn't the problem, loss of spark on a single cylinder is normally indicative of a toasted trigger.

Spend 35 bucks on a Selocs manual, scrounge up an ohm meter and test it - that's cheaper than simply swapping parts.

Alternately, take it to a Merc dealer and pay them 100+ an hour to troubleshoot for you.

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