Quote Originally Posted by Deer Slayer View Post
Me and my papaw go fishing a lot and he is having problems with his boat motor rattling when he has a four blade prop on and it doesn't rattle a bit when we have the three blade prop on and they are they same just that one has more blades than the other does anybody know why and how to fix this.
if you are talking about rattling at low rpm in gear, stop running that prop until you find out what the top rpms are with both props. if this is what i think you are talking about, you are lugging the engine with the bigger 4 blade, and the sound you are hearing is the bearings beating the metal apart in the rods. what engine,prop(s) and rpm?