[MGA]

I was running for about 20 minutes at 4100 rpm and the buzzer goes off.

As far as I know the alarm buzzer goes off for low oil in the outboard tank, low oil in the inboard tank, low oil pressurre, and overheating. I have warning light for the first 3 and recently replaces the oil pump, and anything to do with low oil will shut the engine down to 500 rpm which did nor happen.

The p hole was putting out a good stream, I put my hand on the top of the cylinder which was hot but not too hot to touch and hold my hand on. Re started the buzzer still going, then stopped, I ran the rest of the day at 3600 rpm not problems.

Does anyone have any ideas of what to check ad how?

[rodbolt]

NO remote tank level alarms other than a yellow or center bar indicate on the tach.
if the remote tank filter is clogged its possible at high speeds for the engine tank level to drop faster than oil can be transfered.
what visual indicates are you getting at the alarm condition?
also no oil pressure on that engine.
any alarm condition will limit or reduce RPM to about 2000 RPM not 500.