Is my motor sitting to shallow?

[Tater72958]

I have a 16ft flat bottom with a 1975 50hp johnson seahorse with no tilt and trim.
The bottom was put together by a friend of mine several years ago and i got it at at a good deal. Traded a truck for it!!(i only paid $550 for the truck and drove it for 2 years). I might of had $750 in the truck with a tune up and a few other things but anyways.
The transom has a raiser added to it. Im guessing because the motor has such a long shaft. Model number is 50ESL75B.
I have the in the second hole and any higher it cavitates and will not get on plane.
Below is a pic. Do i need to lower the motor.

 

[Tater72958]

Well crap!!! Cannt get the pic to load up

 

[Bosunsmate]

anti cav plate on motor should be level with bottom of boat

 

[Tater72958]

Ok cool. Im about 1/2 inch below then.

 

[OBJ]

Setting the motor higher on the transom bracket takes away from the tilt travel in the outward direction....meaning the higher the engine the less tilt you can get. My personal engine sets with the cav plate 1 inch above the bottom of the transom. Check the tilt of the engine. If it's tilted out to far you will cavitate trying to get on plane. If you can, set the tilt bar in a hole and try that.....further if it still cavitates on plane.

 

[jbcurt00]

Yep ^^^ having the cav/vent plate even w/ the bottom of the hull is a good starting point. Raising and lowering the motor, and adjusting the tilt pin location in and out is all necessary. Some setups work better a little higher or lower then the bottom of the hull.