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  1. #1

    Best mods to stop porpoise on 15f

    Hi guys(and gals) I just picked up a 2011 STX-15F on Tuesday. I have been riding a 2001 Yamaha XLT1200 and wanted to upgrade to a 4 stroke. I generally ride in the Delaware river which can be pretty choppy. The 15F seems to porpoise alot in even the smallest chop. I have been doing alot of reading here and other forums about mods for this ski. Which mod or combination of mods will settle this ski down in the chop? I am not as concerned about top end speed. I ride with kids on the back alot and really just want to keep it from bouncing and porpoising so much.

    Here is what I have been looking at...

    Aquavein scoop grate
    R&D Rideplate
    After market sponsons

    Of these mods which will give the best relief from porpoising in semi rough to rough waters? Which should I do first?


  2. #2
    robk's Avatar
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    Shreadmaster rideplate. This is a light boat so no matter what you do it's coming out of the water in the rough. The shreadmaster plate keeps the ski flat going across the waves and gets on plane faster than stock or R&D plate.

  3. #3
    Quote Originally Posted by robk View Post
    Shreadmaster rideplate. This is a light boat so no matter what you do it's coming out of the water in the rough. The shreadmaster plate keeps the ski flat going across the waves and gets on plane faster than stock or R&D plate.
    Exactly. The Shredmaster plate is a but pricey but worth every dime.

  4. #4
    Thanks guys. I appreciate the responses.

  5. #5
    Just want to give an update. I have about 6 hours on my ski and I LOVE it more every time I ride it. I did alot of riding in the winding back bays today and it was amazing. The ski just rips around the corners and just seems to want to go faster and faster.

    It did not porpoise as it was doing when I rode it in the river. I think I m becoming more accustomed to the 'different' ride style as opposed the the XLT1200 I used to ride.

    I also took it in the ocean for the first time yesterday and had a blast. Caught some awesome waves.

    I finally opened it up today since I had hit the 6 hour mark...I know it is a dream-ometer but....going down hill with the current and the wind at my back I saw 67 on the speedo...I know I wasnt going that fast but this thing was flying!!! Loving this ski!!

  6. #6
    The 15F in stock form is good for 62ish mph. 15F has many good qualities and your enthusiasm for it is coming across load and clear!

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