'72 Evinrude 25hp -- water backsplashes and sprays

[Captain Caveman]

I've got a 16' Fisher boat with my 25hp Evinrude. When boating around at WOT, a tremendous amount of water splashes up from around the motor shaft and either straight up or against the boat.<br /><br />I shimmed the motor, adding about an inch of wood underneath the mount to raise the entire motor higher. This has helped a bit. Adjusting the trim has also helped out a little.<br /><br />Has anyone else experienced this? What causes it? What is the solution?<br /><br />I assume that this backsplash and spray is slowing down my top speed.<br /><br />Thanks.

 

[Cricket Too]

Re: '72 Evinrude 25hp -- water backsplashes and sprays

Do you by any chance have a doelphin or whale tale on the lower unit? They cause a lot of spray on plane.

 

[BF]

Re: '72 Evinrude 25hp -- water backsplashes and sprays

on my 25, it will kick up fine spray up the sides, but that goes completely away if I shim the motor up 1/2" on the transom. <br /><br />Any chance you're running a long shaft motor on a 15" transom boat?

 

[Captain Caveman]

Re: '72 Evinrude 25hp -- water backsplashes and sprays

No add-ons on the lower unit.<br /><br />The spray isn't a fine mist. It's like the spray from a hydroplane coming out from both sides of the motor.<br /><br />My boat is 20" from transom to running pad. The motor is 22.5"-23" from motor mount to cavitation plate. I just measured it. Does that mean I should try to shim the motor up 2.5 to 3 inches?

 

[Dhadley]

Re: '72 Evinrude 25hp -- water backsplashes and sprays

Yep. That plate should be slightly above the keel. How far up depends on the prop youre using.

 

[elmo]

Re: '72 Evinrude 25hp -- water backsplashes and sprays

had this same problem, old faithful up the transom.... after measuring motor versus transom, i raised motor as far as i could and added a 1 1/2 inch wood block for support..... what a difference..... still need to go another 1/2 inch, but very happy with the current improvement.... top speed is better, and no more water up the transom..... thanks to articles on this forum, i solved my problems. 1979 johnson 35, 14 starcraft aluminum fishing boat.

 

[Captain Caveman]

Re: '72 Evinrude 25hp -- water backsplashes and sprays

I measured last night and I need to raise my motor 3 inches. However, I only have about 1 inch of space to raise the motor before the tightening screws (that hold the motor onto the transom) run out of boat to secure on to.<br /><br />Does anyone know of a transom-raising device available for purchase? I could build an enourmous wood bracket but that would look quite awful. Any suggestions?

 

[wilde1j]

Re: '72 Evinrude 25hp -- water backsplashes and sprays

Sure, get a jack plate. Then you can easily adjust up or down.