Sorry I accidentally added some duplicate pics above

Here is a photo of the location – it is towards the back. I also found some more imperfections as well. I am now working with the Skeeter Boat Center to help diagnose the problem and course of action. I have no idea how all of this happened. The boat has less than 100 hrs on the motor.

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Eric Rehberg wrote:

Couple things. That motor is supposed to run 6000 rpms at wot and fully trimmed not any more. Very little trim is needed when not running wot. If your going wot you should be able to trim it all the way out and not have it porpoise or blow out.

The black stainless prop that comes with that boat isnt a bad prop but there is much better out there.

I ran a 19p reliance series prop from yamaha for the hole time I had the boat and was very happy with it.

I dont recall for sure on that motor but it should be mounted on either the 2nd or 3rd hole down from the top.

The only thing left that i can think of if those things dont take care of it is the hook on the back of the boat is not correct. This would be very rare but a possibility.

Hey Eric

Thanks for the feedback. After looking through my notes, I was incorrect on my RPM’s. With the 3 blade, I max out at 5800 rpms and with the 4 blade I max out at 5500-5600 rmps

pale ryder wrote:

Does it porpoise when the motor is trimmed all the way down ?

I probably should have mentioned this in my initial post, but when the motor is trimmed all the way down, the porpoising is very minor. But once I trim up at all, it porpoises.

Eric Rehberg wrote:

I actually owned and ran a 1880 with a F150 for a couple years. I did not have any noticable issue with that. I had a kicker and did not run a hydrofoil.
What length shaft on the big motor?
what pitch prop?
At what speeds are you starting to trim the big motor out at?
What are your wide open throttle rmps?

Those couple answers may lead us to the answer

Hey Eric,

I have my boat in storage for the winter, but the shaft length on the motor is whatever is standard on this model since the motor has not been changed. I have tried multiple props, but I own 2 props; 3 blade SS 19 pitch prop that is standard on this boat and also a 4 blade Appolo 18 pitch. I begin trimming the motor when I get comfortable at the speed I am going in the weather conditions. The boat porpoises at multiple speed including at max throttle which is at 48mps with the 3 blade prop and 45mph with the 4 blade. Max rpm on the 3 blade is 6400 and 6300 with the 4 blade. The porpoising is worse when I am traveling with a chop and I usually have to throttle up out of it until it settles down but can never fully get rid of the “bouncing”.