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Pinned Carb Fuel Level (everyone's favourite)

Discussion in 'Yamaha 250cc In-Line 4's' started by maelstrom, Jan 24, 2015.

  1. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    Made a page for the Fuel/Float level for BDST carbs. These are the type used on the 3LN series. All contributions from manuals without mistakes are welcome.
    http://litetek.co/Guide_Mikuni_BDST_Fuel_Level.html
    Sorry Mr Grey, I stole your pics. Just send me a bill :)

    And this is the fuel level for the the 2KR & 3HX from @Aerojake which seems to be correct. The fuel level is 17.5mm below the top line (red) in this image.
    [​IMG]
     
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    Last edited: Apr 12, 2015
    maelstrom, Jan 24, 2015
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  2. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    Excellent mate !
     
    GreyImport, Feb 19, 2015
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  3. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    I have to add Ruckusmans 16mm playing card mod and the 10.2mm for 3LN7 if I can find it
     
    maelstrom, Feb 19, 2015
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  4. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    GreyImport, Feb 19, 2015
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  5. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    Thanks Mr Grey
    I have added that now. All criticism welcome.
    Just Zeal and the 3LN7 to add. What document did that 3LN7 value of 10.2mm come from?
     
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    maelstrom, Feb 19, 2015
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  6. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    GreyImport, Feb 19, 2015
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  7. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    Added the 2KR values to the first post thanks to Aerojake.
     
    maelstrom, Apr 12, 2015
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  8. driftwood

    driftwood Well-Known Member

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    Was always a bit confused as to how light a kiss of float tang with spring spigot, guess mine were deep and intense coz... I'm getting better results with a calibrated drain. Went from 40 to 37ml and sootiness has gone (those may not be precise figs coz of meniscus)
     
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    driftwood, Mar 14, 2023
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  9. ruckusman

    ruckusman White Mans Magic Master Premium Member Dirty Wheel Club

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    I found the meniscus to be difficult to judge in thin tube, measuring the volume of the fuel in the bowl is a good way to go about it IMO
     
    ruckusman, Mar 14, 2023
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  10. driftwood

    driftwood Well-Known Member

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    After testing header temp flatstick uphill and then at bottom using IR thermo, tweaked heights. Redid measurements: my std LN3 has sandy plugs at 40ml. Piglet, with Zeal cams & headers and nasty fuel consumption, needed to go lower ie 37ml else plugs were reddish brown. My lord, this is a fine tolerance.
     
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    driftwood, Jul 7, 2023
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  11. ruckusman

    ruckusman White Mans Magic Master Premium Member Dirty Wheel Club

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    That's a great technique you've developed measuring the actual fuel bowl volume - congrats.

    Interested to know the performance difference with Zeal cams - I've compared a set to some 3LN1 and the Zeal cams are narrow and pointy versus a rounder egg shape for the 3LN1
     
    ruckusman, Jul 7, 2023
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  12. driftwood

    driftwood Well-Known Member

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    Shoulda mentioned that both are LN6 carbs with full Viton. So LN6/Zeal cams in an LN3 are a beautiful thing due to smooth torque earlier. But I wanted top-end so persevered with headers. Haven't dynoed other than long steep climb where LN3 just holds 95k, but Piglet comes over at 110ks (despite detuned main jets, for economy)
     
    driftwood, Jul 8, 2023
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