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  1. #1

    Porpoising effect

    I can't seem to get away from the porpoising affect when trying to GPS for top speed. I have the trim set all the way up to keep the nose down, but still get the affect 85-90% of the time. I am running an R & D plate.

    All suggestions welcomed!


  2. #2
    First thing to do is "step" the sponsons, do a search on how to do it.

  3. #3
    gmoeller's Avatar
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    All the way up? or all the way down? Down meaning "wrist twist" forward on your left hand. You will want it down if you are trying to eliminate/reduce porpoising. Do you have any shims in?

  4. #4

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    have you got the ride plate level with the hull. mine has a large washer at the rear to keep it all flush. trim wrist forward one and it rides fine even in the chop. hope this helps.

  5. #5
    Quote Originally Posted by gmoeller View Post
    All the way up? or all the way down? Down meaning "wrist twist" forward on your left hand. You will want it down if you are trying to eliminate/reduce porpoising. Do you have any shims in?
    All the way up - forward - meaning the trim will keep the nose down. Just the factory supports with the ride plate.

  6. #6
    Quote Originally Posted by razzie View Post
    have you got the ride plate level with the hull. mine has a large washer at the rear to keep it all flush. trim wrist forward one and it rides fine even in the chop. hope this helps.
    I'll have to pull it up on the trailer to see if it's flush. Do you have a R & D plate?

  7. #7
    Quote Originally Posted by VOODOO View Post
    First thing to do is "step" the sponsons, do a search on how to do it.
    I did a search and the closest I came up with is to upgrade the sponsons. Is that what you meant?

  8. #8
    maxadrenaline's Avatar
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    Quote Originally Posted by tadam View Post
    All the way up - forward - meaning the trim will keep the nose down. Just the factory supports with the ride plate.
    That statement still confuses ME. You want the nozzle pointing down. Towards the water, ground, bottom of the boat. Your trim lever should be twisted forward/down.

  9. #9
    gmoeller's Avatar
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    Quote Originally Posted by tadam View Post
    .... Just the factory supports with the ride plate.
    Use the two shims in the back of the plate, 2 on each side (supplied with the R&D plate). It will help a lot.
    Yes, I have an R&D plate and yes I've tried it both ways. You will lose some speed but dramatically helps with porpoising.

  10. #10

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    If the jetski nose needs to be down then the trim level at the handle must be up !

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