Roostertail problem???????????
 

I mounted my outboard back on my boat after doing transom, i tested it and had alot of cavitation and roostertail. So i thought it was too high so i lowered it 1 set of holes on the motor, now i got rid of the cavitation but still have rooster tail. I put a flat edge on it in my driveway and the cavitation plate seems to be 1 inch below the keel which i was told would be ok. My boat does not have a bracket, so has anyone ever had this problem? I didn't have any of this before doing the transom and it is driving me crazy. Should i go down another set of holes?

If your doing 60 MPH a rooster tail is a good thing...:)
Is it a prop rooster tail or a transducer or other device hanging on the
back causing the tail ??? Even placement of trim tabs can cause this.
Take a few rear end pics and post them, we might be able to pick
up on whats going on...
Standard on a non bracket transom is an inch above or below the
cavitation plate.. just my 2¢ worth!

Seems to be coming from above the cavitatin plate on the motor area, when I trim the motor up it goes away.

So we know it is not a prop tail!
When trimming up the edge of blade is what causes a true rooster tail
braking the the surface of the water....

Is there an anode or something else mounted on the cavitation plate?

Lets keep digging, we can beat this!! :D

Your 'cav plate should be just above the keel, not below it. Is it dragging through the water? Is the boat loagie and slow in the corners?

http://forums.iboats.com/showthread.php?t=346526

We definitely need pictures! (even if its just to put some circles and arrows on)

When you did the transom, did you change the shape of the running surface of the hull at the trailing edge?

Cheers,
GFS

No nothing on the cav plate at all.

I don't think so i left about a 2-3 in lip all around and did not change any shape of what i left.

Will have pics tomorrow.

I think you are too low. The cav. plate should be about 1/2" to 1" ABOVE the keel IMO....