Sbn44 squirts fuel when cranking.
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  1. #1
    Frequent Poster Meeker78's Avatar
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    Sbn44 squirts fuel when cranking.

    Recently got a used sbn44 and put it on my piston port 550. But when I go to crank it, it leaks fuel out of the diamond plate with the pin hole. Whatís causing this? I have all new lines and Iím using the wax racing front fuel pickup. When I pour fuel down it itíll sputter and sound like it wants to fire but wonít. Now I. Canít even get it to do that. Whatís wrong? Reaaaly donít wanna rebuild the carb.

  2. #2
    PWCToday.com Is My Home Away From Home Grumpy Old Guy's Avatar
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    Re: Sbn44 squirts fuel when cranking.

    Do halfazz work...expect halfazz results

  3. #3
    PWCToday.com Is My Home Away From Home WFO Speedracer's Avatar
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    Re: Sbn44 squirts fuel when cranking.

    Unless a carb is brand new and prejetted I am pulling it apart before wasting my time putting it on.I don't care how pretty the carb is on the outside, it's whats inside that matters.
    Last edited by WFO Speedracer; 01-12-2019 at 06:34 PM.
    Y'all know me, still the same O.G. but I been low-key
    hated on by most these &^$$@s with no cheese, no deals and no G's, no wheels and no keys, no boats, no snowmobiles, and no skis, mad at me cause I can finally afford to provide my family with groceries

    I was 300SXing when 300SXing wasn't cool !

  4. #4
    Frequent Poster Meeker78's Avatar
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    Re: Sbn44 squirts fuel when cranking.

    Lol thanks. I figured better try it before just rebuilding it. Any reason why it’s be doing that though?

  5. #5
    Top Dog Bionic racing's Avatar
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    Re: Sbn44 squirts fuel when cranking.

    Black float bowl diaphragm has failed , don't use a winderosa kit , only oem mikuni

  6. #6
    Frequent Poster Meeker78's Avatar
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    Re: Sbn44 squirts fuel when cranking.

    what do i order? just a mikuni rebuild kit? or is there anything specific i need to order. I also dont know the jets should i order some of those too?

  7. #7
    Top Dog Bionic racing's Avatar
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    Re: Sbn44 squirts fuel when cranking.

    Yes mikuni complete sbn kit
    What are you jetting ?
    PP 550 with a pipe or power jet pipe ? image.jpegimage.jpeg

  8. #8
    Frequent Poster Meeker78's Avatar
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    Re: Sbn44 squirts fuel when cranking.

    factory mariner pipe, stock waterbox, solas 15, pjs intake. and no clue what the jets are. Id appreciate some recommendations. and should i also-order a needle and seat valve?
    Last edited by Meeker78; 01-12-2019 at 10:53 PM.

  9. #9
    Top Dog Bionic racing's Avatar
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    Re: Sbn44 squirts fuel when cranking.

    Check your jets , is carb a factory Yamaha 44 sbn ? From a 650 6m6 ?
    Check needle seat size , stamped on bottom of brass .

  10. #10
    Frequent Poster Meeker78's Avatar
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    Re: Sbn44 squirts fuel when cranking.

    Off a 650sx if that helps.

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