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  1. #1
    senior member RideNfish's Avatar
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    Is 90 hp enough?

    Is 90 hp enough on a 18' North River walk thru windshield. A friend told me 115 as a min. Was told 90 is fine on lighter hull 18' boats like Tracker, Lund, etc. but not so much on the heavier. Also has a 8 hp kicker adding to the weight.
    I don't need high speed but want no problem jumping on plane with 3 people.
    Thanks for input.

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  3. #2
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    Re: Is 90 hp enough?

    The 115 Yamaha would be enough. The 150 is the sweetheart of the Yami inlines. If you can swing it, that's what I would put on it.

  4. #3
    senior member RideNfish's Avatar
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    Re: Is 90 hp enough?

    Should of mentioned it is a used boat. Thanks for your input.

  5. #4
    Senior Member Waterdog's Avatar
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    Re: Is 90 hp enough?

    I don’t know what the boat weighs but 90hp should be just fine. I had an 18’ Alumaweld with a 90hp merc and it pushed the boat just fine. I could do 40 or 41 mph per gps with me and one other person in the boat. With 6 adults and 2 large dogs , 2 ice chests and other stuff in the boat it took a little doing to get up on plane but I was way over the rated weight capacity. With a total of 4 adults plus fishing equipment the boat performed great.
    Its always good to have more horsepower than less but if you really like the boat , and the price is right I’d buy it in a second with a 90 hp.
    Be sure to take it for a good test ride and then decide.
    Hunting, Fishing and Labrador Retrievers and at the end of the day a glass of Buffalo Trace Whiskey- Life is Sweet.

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  7. #5
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    Re: Is 90 hp enough?

    I had a 18 ft North River Seahawk, off shore bracket.
    Had a 8 hp kicker,,,,,,, 90 hp Suzuki main motor, plenty of power.

    Is it a Seahawk or Mariner ??

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  9. #6
    senior member RideNfish's Avatar
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    Re: Is 90 hp enough?

    Quote Originally Posted by SteelyMan View Post
    I had a 18 ft North River Seahawk, off shore bracket.
    Had a 8 hp kicker,,,,,,, 90 hp Suzuki main motor, plenty of power.

    Is it a Seahawk or Mariner ??
    Mariner I believe. No offshore bracket. Doesn't say in add but when I talk to the guy I would get all details.

    Here is one like it.

  10. #7
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    Re: Is 90 hp enough?

    Let me clarify my first post. Yes, a 90 will work just fine. A 115 would be better and if the boat is rated for it, a 150 would be perfection. With the 90, you will notice a significant performance loss at around 4000 ft and above. Combine that loss with you three buddies aboard and you may be dissapointed. You can compensate for some of that with a prop change but it will still be sluggish. I had the 150 on my 20ft KingFisher Discovery and it was impressive at sea level but even that motor at Pyramid (almost 4000ft) was sluggish with 4 aboard. Because of that, I put the 250 on my 22' North River SeaHawk and then had them do the firmware upgrade to make it a 300hp motor. It never lacked power even with a full load and I never needed a second, high altitude prop.

    That said, if it's got the 90 on it now, run it and see what it's like. If it works like you want then a second, high altitude prop is a cheap fix for those time when it's needed. If you don't want to change props or you start feeling performance issues compared to similar boats with more power then think about upgrading.

    The North River's are great boats but they are heavy compared to most any other aluminum boat out there. The good is that you can't hurt them, the bad is that they sometimes need a little more power than other boats.

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  12. #8
    Senior Member burninfuel's Avatar
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    Re: Is 90 hp enough?

    2005 Crestliner Serenity 1800, 18'2" 95" wide and 41' deep
    40 gallon fuel 280#
    4 battery's 200#
    basic boat 1465#
    Honda 90 and 8hp kicker hi torq 478#
    2 cannon electric DR and balls 55#
    Tackle and rods ice chest 60#
    and my fat ass 2738
    put 15p prop on and jumps out of water fast and get 31 mph on gps and 6k rpm
    at 5000' elevation
    Yes it will do great


    Last edited by burninfuel; 08-11-2019 at 07:47 PM. Reason: edit

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  14. #9
    Senior Member Hookem2004's Avatar
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    Re: Is 90 hp enough?

    I would personally want a little more power. I had. a tracker bass boat with a Mercury 90 and I thought it was under powered.
    2018 Duckworth 235 Pacific Navigator
    Yamaha 250HP
    Yamaha 9.9 HP
    Scotty's downriggers
    Lowrance Ti2's

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  16. #10
    Senior Member duhkevinz's Avatar
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    Re: Is 90 hp enough?

    Quote Originally Posted by Waterdog View Post
    I don’t know what the boat weighs but 90hp should be just fine. I had an 18’ Alumaweld with a 90hp merc and it pushed the boat just fine. I could do 40 or 41 mph per gps with me and one other person in the boat. With 6 adults and 2 large dogs , 2 ice chests and other stuff in the boat it took a little doing to get up on plane but I was way over the rated weight capacity. With a total of 4 adults plus fishing equipment the boat performed great.
    Its always good to have more horsepower than less but if you really like the boat , and the price is right I’d buy it in a second with a 90 hp.
    Be sure to take it for a good test ride and then decide.
    How did you feel about the splash well in the rear with all that weight...? I still get scared when I get a few inches high of water in the motor well....


    Sent from my iPhone using Tapatalk

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