I need Help.

[mja2770]

I have a custom built 15.5' boat. It was built for a Go-devil, now I am trying to run a 1975 25hp Johnson on it. According to the numbers on the engine it is a long shaft. My transom measures 17" and with the engine on it the cavitation plate sits about 2" below the boat. When I run it starts cavitating on me. From what I have been told as long as the plate sits below the boat it should not do this. Can some one help.

 

[tashasdaddy]

Re: I need Help.

adjust your tilt pin, it changes the angle of the motor. you will have to experiment a little. if that does not work, try a mini jacker, jack plate or make on. your AV plate should be even to 1 1/2 inches above the keel. too much foot in the water could be directing water away from the prop.

 

[mja2770]

Re: I need Help.

OK cool. So you think I may have to much in the water then?

 

[tashasdaddy]

Re: I need Help.

you got it. http://www.iboats.com/Jack_Plates/d...ategory--**********.007954104--view_id.217144

 

[mja2770]

Re: I need Help.

Ok going up seemed to make it way worse. I'm starting to think it is a prop problem so I posted a new question in the prop section.