Re: Just ordered new sun tracker
You're only talking 22 or 23 mph with a 90 hp 25" twin pontoon boat.
If you're a tuber, go ahead and change your order to a 115 hp now. Horsepower is cheaper now than in the future, and everyone wishes they had a bigger motor.
Pontoon boats are extremely long lasting boats, and they should be spec'd out for your present and projected future needs when first purchased.
I've owned my pontoon 26 years, and is still very seaworthy with the original Yamaha 2 stroke 115 hp motor. But, my twin pontoon boat handles like a pig trying to maneuver around skiers and tubes and at high speeds.
Since I have second set of young grandchildren that'll be tubers/skiers, we're leaning toward purchasing a 22' tritoon with lifting strakes and a 150 hp motor in the near future. That's the ideal size/combo for your use.