Hi ichi,
I have no idea and if you think it is an oil alert (I'm not sure if the 390 has one but if you say it does) then first thing I would do is disconnect the oil alert switch and see if that stops the noise, at least that will eliminate it.

Entire Thread
Subject	Posted By	Posted
What's that sound? Greenfield with a Honda GXV390	ichiwowa	10/06/20 07:49 AM
Re: What's that sound? Greenfield with a Honda GXV390	NormK	10/06/20 08:21 AM
Re: What's that sound? Greenfield with a Honda GXV390	ichiwowa	10/06/20 08:51 AM
Re: What's that sound? Greenfield with a Honda GXV390	ichiwowa	11/06/20 09:15 AM

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