How Much Horsepower for your Outboard Motor?

Enough horsepower here?

Getting the right amount of horsepower for you pontoon boat outboard motor is a huge consideration for your vessel. It's a big commitment, so you want to choose an outboard motor that lets you have fun and won’t bring regrets later. Remember that going with too little horsepower doesn’t necessarily result in fuel efficiency if the motor will struggle maintaining your desired speed.

All of our vessels are 24 and 25 feet in length, and we generally prefer outboard motors of 150 to 175 hp on these. Consider that our vessels are all tri-toons, so they are heavier than a comparable pontoon with only two tubes. Without passengers, our boats can make approximately 25 mph at wide open throttle (we won’t get into prop tuning here), but we generally operate our tours at no more than 15mph. This combination of boat and outboard motor size results in ample speed, quiet operation, and very good fuel efficiency.

For most pontoon users, 15 mph is considered a comfortable cruising speed. Achieving this speed without screaming the outboard motor also contributes to a quieter and leisurely ride, where you can still carry on a conversation. Also, a top speed of 25mph is sufficient for running from weather toward safe harbor. So here is where the topic comes down to personal preference and needs. Will you be pulling water toys and people? If so, go with 200 to 225 hp on a 24 ft pontoon. If you are a speed demon looking for the thrill of being buffeted by turbulence? Then a 300 hp outboard motor it is.

A shorter length boat obviously needs less horsepower, but I would not overdue it with downsizing your outboard motor. Remember that pontoon boats don’t turn very well, and your horsepower is part of your steerage. An 18 ft pontoon loaded with people will be a lot for a 90 hp outboard motor, unless you are assured of being on smooth lake water.

If you get the opportunity, get a look at other pontoon boats out on the water. Make note of

• How many people are on the boat?

• What size outboard motor are they running?

• How fast they are going with that passenger load?

• How loud is the outboard motor at that speed with those many passengers?

Although not very scientific, these observations can certainly get you into the right neighborhood for horsepower. Remember if the outboard motor you observed was screaming, it was likely at wide open throttle, and may be undersize for the number of passengers and speed. Finally, have a conversation with the owner/captain and get their thoughts and feedback.

Selecting the wrong outboard motor for your pontoon boat can really get in the way of a great time on the water. Take the time to do the research we recommend, and you'll be able to an informed decision, and avoid regrets.