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Thread: Prop/nozel ???

  1. #1
    steach's Avatar
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    Prop/nozel ???

    What prop / nozel do you suggest??? - I love acceleration but top-speed's not bad either.

    2006 GPR.
    -stepped sponsons
    -R&D 1200 grate, PPK
    -R&D 1300 plate
    -R&D D-Plate
    -tach installed
    -EFI on the way

    I'm looking to order a dynafly 14/20. Do I need an 87mm nozel or should I stick w/ a concord 13/19 for acceleration?


  2. #2
    Moderator RX951's Avatar
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    For your 2006 GPR, I would use the dyna-fly as it fits the hub of the stator vein properly.

    The current reduction nozzle on your ski should be an 85mm nozzle.

    I would keep that on there.

    I would also look into increasing the compression (mill the stock head) slightly also.
    This will give you some bottom end power.

    Get the with EFI guru's and see that they recommend for safe compression with your current mods and the proposed EFI settings they may suggest.

    If you don't already have one, get a good aftermarket tachometer for tuning purposes. (Pet-2100).
    See Jerry's online store for this.

  3. #3
    steach's Avatar
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    Ok, DynaFly 14/20 w/85mm

    Quote Originally Posted by RX951
    I would also look into increasing the compression (mill sock head) slightly also.
    This will give you some bottom end power.
    I was very surprised how low the compression was (bone-cold WOT 121,121,120) . I'm used to Doos(+30#s).

    -I'm NOT interested in breaking the head due to extended warenty.

  4. #4

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    Quote Originally Posted by steach

    -I'm NOT interested in breaking the head due to extended warenty.

    OHHHHHHHH NOOOOOOOOOOOOOOOOOOOOOOOOOOO you shouldn't have waisted your money on that!!!!!!!!!!!!!!!!!!!!!! Is it to late for a refund? IF anything goes wrong you can fix it the right way with the info you get here. They will just take it factory spec and may leave you worse off IF you every have to use the darn thing...

  5. #5
    r33pwrd's Avatar
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    Buy an extra head (or afterarket ones) and if anything where ever to go wrong you could pull the efi and the heads in about an hour and I would be "under warranty" again

  6. #6
    steach's Avatar
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    Quote Originally Posted by RXPkiller
    OHHHHHHHH NOOOOOOOOOOOOOOOOOOOOOOOOOOO you shouldn't have waisted your money on that!!!!!!!!!!!!!!!!!!!!!! Is it to late for a refund?
    I spent a little for 5 years piece of mind. Everything I have done is easily replacable to OEM if something happens.

    How much is an ECU($900), short block($4,000), wire harness($750), fuel pump($580), starter assemb($900)???

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    steach's Avatar
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    Quote Originally Posted by r33pwrd
    Buy an extra head (or afterarket ones) and if anything where ever to go wrong you could pull the efi and the heads in about an hour and I would be "under warranty" again
    If I bring a ski in with a piston chewed-up and the head in perfect condition it'll look a little fishy.

    I should be looking for a thinner head gasket. Any suggections?

  8. #8

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    I believe your stock gasket is double layered.

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    Happily Self-Employed WFO's Avatar
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    Quote Originally Posted by steach
    If I bring a ski in with a piston chewed-up and the head in perfect condition it'll look a little fishy.

    I should be looking for a thinner head gasket. Any suggections?
    You are right about that. Salty is right, the 1300s have a 2 layer gasket. The warranty is OK if you dont touch the motor, and you are going to be limited on mods you can do. Hell, some dealers wont warranty if you put in a D-plate.

    The DF 14/20 is going to be too much prop for a stock motor.

  10. #10
    steach's Avatar
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    Quote Originally Posted by WFO
    The DF 14/20 is going to be too much prop for a stock motor.
    Do you suggest an alternate prop?

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