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Posting a reply to: RE: 2003 90 hp Yamaha 4 Stroke

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Brian Mealey

Posted 6/18/2012 4:54 PM (#566020 - in reply to #318942)
Subject: RE: 2003 90 hp Yamaha 4 Stroke

I had the same problem with ethanol, except had to replace the carburetors.

I only use non-ethanol fuel/recreational fuel in south florida. All marinas now carry recreational fuel due to the demand from the boaters.

Another Alert!

I have a Yamaha 90 hp 4 stroke, I believe 2003, the last year with carburetors.

Last week testing engine for summer research and ran well until I came in. Engine shut down but restarted after an hour.

Cranked right up by the boat mechanics who then noticed that the Voltage regulator and the CDI appeared to have caught fire since the entire system was melted. They have never seen this before.

Has anyone heard of this happening before?

We are a non-profit volunteer organization who unfortunately have had consistent problems with this engine. Very expensive to fix!