91' Superjet Carb Settings?
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  1. #1
    I dream skis 1983's Avatar
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    91' Superjet Carb Settings?

    -Ive done some digging on the net and unable to find oem factory settings for the SBN44 carb on my 1991' Yamaha Superjet w/650cc engine.

    -I recently acquired it from the original owner and am going to go through the carb and rest of fuel system. Anyone know what the factory settings and specs. are on the single carb?


    -I found this but not sure if correct, some things i'm seeing show low and high speed adjusters at 1-1/8th out and then this:


    " BN44-40-43
    LOW SPEED JET: 120
    HIGH SPEED JET: 114
    NEEDLE/SEAT: 1.5
    ARM SPRING (GRAMS): 115gr.
    LOW SPEED ADJUSTER: 1.0
    HIGH SPEED ADJUSTER: .75 "



    -Thanks for help,

    Ski is 100% stock. Has been sitting for years, just going through fuel system so it will start on its own, not with starting fluid, and be reliable at lake.

  2. #2
    I dream skis 1983's Avatar
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    Re: 91' Superjet Carb Settings?

    I found these doing some more research. On the one picture am I seeing " SJ650 " at the top of the chart? Hard to read but there are two 44m carbs under that tab.

    I put a " SJ 650 ? " wording above the tab.

    yamaha carb adj.jpg

    yamaha carb adj 1.jpg

  3. #3
    I dream skis 1983's Avatar
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    Re: 91' Superjet Carb Settings?

    Pulled carb. apart last night. Very clean inside.

    Internal filter had nearly no debris in it. One tiny piece so cleaned filter.

    Checked low and high needle settings before disassembly and they were both at 1-1/4 turns out from closed.

    Both jets were clear and orifices not obstructed. Cleaned them anyway.

    Still seeking factory settings. Will continue to research.

  4. #4
    I dream skis 1983's Avatar
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    Re: 91' Superjet Carb Settings?

    Can anyone confirm if i'm close on the low and high speed needle settings? This is for a stock ski.

    I am finding either 1-1/8 turns out on both or 1-1/4 turns out on both needles.

  5. #5
    Top Dog SkiSwede's Avatar
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    Re: 91' Superjet Carb Settings?

    1-1/8 on both.

  6. #6
    I dream skis 1983's Avatar
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    Re: 91' Superjet Carb Settings?

    Thank you


    Quote Originally Posted by SkiSwede View Post
    1-1/8 on both.

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