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  1. #1

    I'm new here with a 300X question

    Just got a 300X after having a couple different Sea Doos (nothing new though) and I must say it is amazing! Never felt such acceleration on water before! I'm hooked! I've been reading about how the top speed is limited to 67mph and about all the aftermarket stuff you can get which I will probably be investing in evenually. But what is the max rpm for stock machine? Mine does 67 with no problem and throttle travel to spare but it's only revving about 7300ish. Is this normal? Also it seems to have a slight vibration at that rpm as well. Could that be the limiter? Any info would be greatly appreciated. Thankx!


  2. #2
    Shouldn't be any vibrations.
    Last edited by Chris288; 07-26-2011 at 09:22 PM.

  3. #3
    Quote Originally Posted by Chris288 View Post
    Stock, My ski maxed out at 7,500 and 67 mph, did the 15 cent washer mod and She's turning 7,900 and touching 72. Shouldn't be any vibrations at all.
    Does anybody have any pictures of the washer mod? I cannot find anything on the search.

  4. #4
    nicjak's Avatar
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    the vibration would be the limiter cutting in at a guess

  5. #5
    nicjak's Avatar
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    just space the speedo pick up off the plate

    Quote Originally Posted by kfxbryan View Post
    Does anybody have any pictures of the washer mod? I cannot find anything on the search.

  6. #6
    gmoeller's Avatar
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    Quote Originally Posted by nicjak View Post
    just space the speedo pick up off the plate
    What size washer?

  7. #7
    nicjak's Avatar
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    work it out or search on here theres about ten threads on it. its not rocket science, spacing it up slows the wheel down =more speed. but the module is by far more reliable.

  8. #8
    gmoeller's Avatar
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    Quote Originally Posted by kfxbryan View Post
    Does anybody have any pictures of the washer mod? I cannot find anything on the search.
    Quote Originally Posted by nicjak View Post
    just space the speedo pick up off the plate
    ncjack....SEARCH does help...I got lazy.

    #12 washers from Lowe's. You will need 10 washers.
    Remove the speedo pickup from the ride plate.
    Shim the front two screws of the pick-up with 3 washers.
    Shim the rear two screws with 2 washers.
    Went from 67.6 to 72.3 mph with only this change.
    This way everyone will not call MACC asking the same
    questions.......this is what all the racers did for the 300
    mile race and worked fine. Speedo will read low, because we are
    fooling the pickup so it does not read to the speed limiter.
    YES> the speedlimiter is used through the paddlewheel. Use
    a gps to verify. its just fooling the pickup./

  9. #9
    Quote Originally Posted by gmoeller View Post
    ncjack....SEARCH does help...I got lazy.

    #12 washers from Lowe's. You will need 10 washers.
    Remove the speedo pickup from the ride plate.
    Shim the front two screws of the pick-up with 3 washers.
    Shim the rear two screws with 2 washers.
    Went from 67.6 to 72.3 mph with only this change.
    This way everyone will not call MACC asking the same
    questions.......this is what all the racers did for the 300
    mile race and worked fine. Speedo will read low, because we are
    fooling the pickup so it does not read to the speed limiter.
    YES> the speedlimiter is used through the paddlewheel. Use
    a gps to verify. its just fooling the pickup./
    Thanks for the info, i was wondering how it was done too.

  10. #10
    Quote Originally Posted by Chris288 View Post
    Stock, My ski maxed out at 7,500 and 67 mph, did the 15 cent washer mod and She's turning 7,900 and touching 72. Shouldn't be any vibrations at all.
    Thanks for the feedback. Still not sure if it's a vibration or the limiter or what. Haven't had time to get it looked at.

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