Vibration at 30 mph.

[Pureluck]

I have a new vibration at 30mph only. I had a look at the lower unit and the only thing I see is rub marks on the right side of the lower unit where it goes into the horseshoe looking knuckle attached at the base of the boat . No wear marks on the left. Is this easy to center again?

 

[sandkicker]

First place to check for vibrations is the prop. It is unlikely that you managed a rub mark on the case without involving the prop.

 

[Pureluck]

First place to check for vibrations is the prop. It is unlikely that you managed a rub mark on the case without involving the prop.

The rub Mark is caused from going back in the holder attached to the boat. It's 2 snug on the right side. Is there a way to center it