1991 Force 50 HP

[Jessie Jr]

Put a 50 HP Force on a 16' Sundance Skiff that came off of a pontoon boat. Give it full throttle and it goes about 5 mph. Sounds like it's in a strain. Does the prop need to be changed?

 

[Maclin]

Welcome aboard!

By "in a strain", do you mean it struggles to gain RPM's, or that it is running at too high of an RPM?

 

[Jessie Jr]

It struggles to gain rpm. It's like it's tied to the dock and you try to take off. Revs up fine out of water with no pressure on it.

 

[Maclin]

Do you know how it ran when on the pontoon? Is it the same prop as when on the pontoon? Do you know what pitch the prop is?

Pontoons are a heavy load for most any engine, and much lower pitch props have to be used. If your engine came right from the pontoon as dressed there then I would expect it take off very well but rev way too high too soon, and the engine would need a different prop.

 

[Jessie Jr]

Not sure on the pitch. If the motor were set too low would it cause it to do this?

 

[Maclin]

Maybe, if it is a long shaft on a short shaft transom, but expect it would not be as severe as you described.. You have 3 posts in, can you post some pics of the mounting from the side?

 

[Jessie Jr]

The boat is at the beach which is 100 miles away but we mounted the cavitation plate on the motor flush with the bottom of the boat.