1darknight
Member
I have a 2012 new Mercury 60/40 Jet 4 stroke. At idle, maybe 600 to 800 and up to a 1000 rpm the jet pump resonates/vibrates/ or rattles and is noisy, above 1000 rpm everything is just fine. My previous Yamaha jets never were noisy at idle. Is this normal or something to be concerned about, it occurs both if engine is on the water hose or in the lake. Thanks.
Bill from Alabama now.
Bill from Alabama now.