Voltage regulator & CDI meltdown?

[bkmealey]

I have a Yamaha 90 hp 4 stroke, I believe 2002, 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!

[99yam40]

Does this motor have the water cooled regulator/rectifier?
If so plugged cooling can cause it to overheat.

I have heard of bad battery connections causing problems also

[boats.net]

May have had a wire get chaffed and shorted to ground, when replace them chack all wiring is secure.