Re: sound in boat hull. Run great just noisy hull
welcome ksstick. ya might read this.
http://forums.iboats.com/showthread.php?t=220416
so if it's not coming from the engine. it must be coming from the drive. here's a few common things but w/o knowing more, it's gonna be hard to say i believe. how's the prop condition? have ya had any drive service done. like lub ujoints, coupler, gimble brg.? have you checked alignment?
take a buddy with you on a run. see if they can figure out where exactly the sound is coming from perhaps.. when i'm looking for a strange sound i can't locate. i will use any ol hose, a few feet long, as a hearing horn to help try to isolate where the sound is coming from..