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  1. #1
    Hydrotherapy's Avatar
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    All out of ideas of why she wont rev

    hi guys,

    as some may know my conversion 12/13 jump boat wont rev correct on top,

    its been a working progress and i'm now at the end of my plan and have nothing left to try,for this reason i come back to the members to pick your brains on why might be up

    jump boats mods so far

    2005 non pv 1300 top end
    2005 compleate exhaust + ss + 1300 w/b
    150.150.145 psi stock cut heads
    d plate, riva ,uncut
    vf 11 reeds no spacer
    riva filters
    oside carbs
    1200 electrics
    advent running yam 94,limiter set to 7500rpm
    2005 ho pump, no 2" spacer
    87mm nozzle
    1200 grate
    premix
    primer fitted

    spun today a dyna 13,5/19 @7100 (pet2100)

    just cant seem to get her to spin up although the speeds are very good for a stock plate(rought water boat) i should be spinning the hell out of a 13/19 but i aint as you can see...

    was a last ditch attempt today after fitting the advent and was soo pissed with it all it just went back on the trailer and came home with my tail between my legs..

    the only thing i can think of trying is putting a stock prop on to see what rpms i get,

    have you guys got any idea where i should be with a stocker??

    any advice would be great as i am all out of ideas and bits to bolt on.


  2. #2
    WATER WOODY's Avatar
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    What speeds Hydro? 68-69mph with the mods listed. A modded plate will help alot.
    Last edited by WATER WOODY; 09-04-2008 at 04:20 PM.

  3. #3
    Hydrotherapy's Avatar
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    pre advent speeds,

    13.5/19 @ 7100 70.2 3/4 fuel

    15/18.5 @ 7190 70.8 1/2 to 3/4 fuel

    had some 71's but cant count as could not get both ways every time

  4. #4
    WATER WOODY's Avatar
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    What speeds after Advent if any?

  5. #5
    Hydrotherapy's Avatar
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    Quote Originally Posted by WATER WOODY View Post
    What speeds Hydro? 68-69mph with the mods listed. A modded plate will help alot.
    guess the speeds aint to bad then

    no bs on those speeds posted STEVED see me run all my stuff

    want to keep this plate stock as its a winter boat and our winters get rough,so i keep my ported boat nice and dry at end of year...well when it aint blown up that is ...

  6. #6
    WATER WOODY's Avatar
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    One thing to remember,a modded ,aftermarket plate will give you another 4mph! So you could be in the 75mph range with good weather and water conditions. Go out and enjoy riding.

  7. #7
    Hydrotherapy's Avatar
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    Quote Originally Posted by WATER WOODY View Post
    What speeds after Advent if any?
    when i saw the revs i loaded it up and went home,i wont give up but its been a bad week with a death and i have trashed my shoulder bad,enough was enough today

  8. #8
    WATER WOODY's Avatar
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    Sorry to hear about your week bro.Your ski is ok.Whats your weather like there?Weather plays a big part in tuning/speeds/rpm.

  9. #9
    Hydrotherapy's Avatar
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    Quote Originally Posted by WATER WOODY View Post
    Sorry to hear about your week bro.Your ski is ok.Whats your weather like there?Weather plays a big part in tuning/speeds/rpm.
    weather pretty cold as always

    sent lowell a few months rad figures of when i ride and he concludes us uk boyz wont suffer heat soak and rad problems like you usa boyz

    my reason for putting stock prop on one hour ago is as follows,tell me if i am wrong ??
    uk guy tweeks my jump boat props, can he bend them in such a way that i cant get rpm's up ??? but get speed

    get reading off stock prop weekend and get a us dyna fly pitched sent to me,only use you guys for ported ski but for speed of delivery had this uk guy do my jump boat props,

    bottom line i cant spin a 13/19 this cant be right
    Last edited by Hydrotherapy; 09-07-2008 at 12:24 PM.

  10. #10
    WATER WOODY's Avatar
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    Have you tried turning up the fuel on the highs?

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