my mako238 has a 1995 evinrude 225 with vro pump and tank removed.once on plane at 3200rpm the buzzer starts to chirp.then moving up the rpm range the buzzer is more steady. the cooling temp is 152 deg. tested with lazer thermometer.had new pump and heas gaskets 20 hours ago.i mix gas/oil at1quart oil to 12gal.gas.the gas is 1.5years old with sta bil added.i have not noticed any performance decrease.my thought is a fuel concern issue so i replaced all hoses filters and primer ball. took fuel sample when changing filters found no water. also the tank was replaced 3 years ago.my question is am i looking in the wright area for my buzzer concern or should i be looking elsewere?
