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See pic they are more costly but a tri toon is the way to goi had a 28 pontoon boat with the smaller toons it was like trying to push a elephant through the watereven after I got all the water logged plywood seats out and just had an open deck I was going to purchase another 24 toon to go up the middle to get it up out of the water some.
Pontoon motor too low. I recently upgraded to a 70 HP Suzuki OB for my 1986 Grumman pontoon and immediately began to have cavitation problems. You can often tell that an outboard is too low if you are experiencing sluggish speeds poor handling excessive spray porpoising or even water pushing up into the cowling. Wrong motor power can cause the boat to sink.
Mounting the motor lower on the boat transom can create excessive spray increase case drag reduce underwater clearance and negatively impact faster boats. Outboard motor shaft lengths are standardized to fit 15-inch 20-inch and 25-inch transoms. This reduces the power of the propeller especially its push on water.
Your engine mounting is already too low apparently because of the spray so I would not lower the mounting height rather it may have to be raised a little. It is rated for that engine. The water line is another 4-5 inches above that.
I went and checked out my boat and the motor seems WAY too low. From what I understand about pontoons is the way to set motor height is to raise it a bit at a time until it starts losing prop bite then drop it back down. I never seen a motor that big on a pontoon.
How do you know if your outboard is too low. If you are 250 RPM low say about 5700 but you want to get to 6000 raising the motor a hole might get you there and produce about one additional mile per hour in top speed said Greenwood. On the flip side if the outboard is set too low it triggers enormous drag.
Common Engine Problems The four main engine problems that pontoon boaters experience can be summed up as overheating lack of power emission of smoke from the exhaust and a no-start. This last issue is when the engine simply wont start and it could be the result of several issues. Selling for 8000 or best offer.