25 mercury. Seems to have a slight cavitation at full throttle.

[frobotz]

At WOT I get a slight rev increase , very intermittent and only for a half second or so. It wont turn at WOT without cavitating. the cavitation plate is slightly below the bottom of the transom.

Here are a couple pics. Any suggestions. Maybe a prop pitch prob

 

[frobotz]

Delete, I got it to upload

 

[frobotz]

No Title

shrunk to 10%, Try this

 

[frobotz]

No Title

Got it.

 

[frobotz]

No Title

Motor is sitting down on the transom. Cant adjust it any lower without cutting into the transom.

 

[frobotz]

Any ideas will be appreciated. Thanks in advance.

 

[hardwater fisherman]

Have you tried lowering the tilt pin down one hole?

 

[frobotz]

I did lower the pin hole. Lost a lot of speed by submarining the boat thru the water. Gonne toss it in the lake tomorrow and try it again. I moved the battery to the very rear as well to try to help with weight distribution.

 

[jimmbo]

What make of prop is that? It doesn't look a mercury prop. Also what are the silver spots on the gearcase?

The bottom of the hull, us there a pronounced Keel directly in front of the gearcase?

 

[frobotz]

Spots on the case are seal tape over the fill drain holes. Just secondary insurance for water. Not sure on the prop, Was on the motor when I bought it.

 

[jimmbo]

I would try a prop that has more rake and some cup.

 

[hardwater fisherman]

You could try dropping it down one hole and then shim up the motor a little bit. Then try it and see how it runs and if not enough, just shim it up a little more.

 

[steelespike]

The prop looks a little mundane you might try a Solas amita or rubex. or check out the Turning point Hustler.
Both brands are the latest technology.The Hustler is said to deliver close to ss performance. And many suggest a 1" reduction in pitch on the Hustler.Of course that would depend on your present numbers. A induction tach is pretty much a must and an easy install.

 

[Sea Rider]

If combo rides at wot parallel to water level while OB sits at 90 deg and you're experiencing prop areation at tight close turns and much worst on slight choppy sea cond, that OB definitely sits way high on transom. If moving trim in / out will lose best prop populsion as the angle of attack will vary.. Is that a S or L size 25 OB ?

Happy Boating

 

[frobotz]

My outboard is a long shaft. It sitting all the way down on the transom. Been raining so I haven't had a chance to test run it again. I was thinking about aeriation myself. I know the prop is a pusher prop for a larger boat , The motor came off a boat a good bit bigger then mine, and probably a good bit heavier so I think there is some merit to that idea. It might be a wash anyway at this point I am looking into trading for a 40 as we speak but would still like to remedy this for personal satisfaction.