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  1. #21

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    Jul 2015
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    Pop Off Too Low on Stock 1200 PV (66V)?

    I thought the low speed adjuster was for idle only? I'm kind of surprised you recommend the stock 87.5 pilot jet (GP1200R comes with 95), and also recommend the 115 gram spring. That keeps pop off high. Combination of that, to me seems like it would keep the motors lean in the lower range. Am I missing something?

  2. #22
    Tool Bag water worx's Avatar
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    Aug 2006
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    Quote Originally Posted by Robb235 View Post
    Am I missing something?
    Not trying to be rude but yes you are missing the whole ideal of jetting & are way over thinking this issue.

    I am done I have told you how to fix your boat now do it or continuine to make up your own jetting that hasnt worked yet....

  3. #23

    Join Date
    Jul 2015
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    Chattanooga, TN
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    96

    Pop Off Too Low on Stock 1200 PV (66V)?

    Quote Originally Posted by water worx View Post
    Not trying to be rude but yes you are missing the whole ideal of jetting & are way over thinking this issue.

    I am done I have told you how to fix your boat now do it or continuine to make up your own jetting that hasnt worked yet....
    Not trying to argue, just trying to understand. No need to get upset...

    It's just you made the statement that these boats run lean in stock form in the low speed, yet recommended the stock jet and the stock spring: the two things that control low speed fueling.

    The SBN manual states that the low speed adjuster is only for adjusting idle mixture. So that's why I'm trying to understand the "why" of what you're telling me. Click image for larger version. 

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  4. #24
    Look at the diagram on page 7: http://www.mikuni.com/pdf/sbn_manual.pdf

    The low speed jet and needle bypass are always providing fuel especially at idle and low loads which is when the throttle plate is creating a vacuum low-pressure-area at the low speed ports dumping into the intake tract.


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