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Alternative Floats.

Discussion in 'The Garage' started by Rasputin, Sep 10, 2020.

  1. Rasputin

    Rasputin XS650 Addict XS650.com Supporter

    B8F7052E-B349-45FD-A460-CCD92606C838.png i thought I would put this here just in case.
    Replacement carb floats from a Mycarb, Indian copy of a Mikuni fitted to Indian built Royal Enfield.
    At the price I thought I’d take a risk, so I ordered a pair and tried them in some Mikuni carbs I am working on and they fit.
     
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  2. Jim

    Jim Beyond the edge is the unknown. Here be Dragons XS650.com Supporter Top Contributor

    BS34's or BS38's?
     
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  3. jetmechmarty

    jetmechmarty What should I put here? XS650.com Supporter Top Contributor

    MIKUNI CARB BS32/12 FLOAT OEM# 256-14985-00-00

    There is a long list of carburetors that these floats are correct for, but included are XS-1 through XS650F. The price for made in Japan floats might be tough to beat. Sirius is a vendor I've had good luck with.
    The OP float listing probably fits BS38.....Maybe.
     
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  4. Rasputin

    Rasputin XS650 Addict XS650.com Supporter

    Call me an ignoramus, but I’m not sure, the carbs I’m working on are from a Kawasaki KZ750 twin. Very similar to XS 650, the ones with the jets in the float bowl. The only difference I can see is the tangs on the cross piece are opposite way round.
     
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  5. Rasputin

    Rasputin XS650 Addict XS650.com Supporter

    BS34 I think. Linked butterfly rod and chokes.
     
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  6. Jim

    Jim Beyond the edge is the unknown. Here be Dragons XS650.com Supporter Top Contributor

    This article says they're 38's.
     
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  7. Rasputin

    Rasputin XS650 Addict XS650.com Supporter

    Thanks for the link. You are correct, looks like I have some more reading to do. Appreciated.
     
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  8. 650Skull

    650Skull SSSSSSSSSlither Top Contributor

    Jim, Rasputin, Mailman and 1 other person like this.
  9. Rasputin

    Rasputin XS650 Addict XS650.com Supporter

    I have fitted Cruzinimage floats in anXS500 I did recently, although not as accurate as Mikuni they worked fine.
    Just to mention, good service from them.
     
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  10. TwoManyXS1Bs

    TwoManyXS1Bs BBQ Hunter Top Contributor

    MaxPete, gggGary and grizld1 like this.
  11. Rasputin

    Rasputin XS650 Addict XS650.com Supporter

    I have recently used floats from Cruzinimage on an XS500 I did for a friend. I had no problems with them fitting and they worked fine. Although they weren’t as accurate in appearance as OEM floats.
    Then I spotted the Indian ones, seller was in UK and he offered a discount if you purchased multiple items.
    This last few days I had a KAWASAKI KZ750 in for some work while I had the carbs off I tried the floats in they fitted fine. The only difference I could see is the tangs on the crossbar are the other way round.
    I will measure them up and post some detailed pictures, maybe tomorrow.
     
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  12. Rasputin

    Rasputin XS650 Addict XS650.com Supporter

    As promised.
    All measurements are approx as my eyes aren’t too good.
     

    Attached Files:

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  13. TwoManyXS1Bs

    TwoManyXS1Bs BBQ Hunter Top Contributor

    Thanx Rasputin.
    But what I really wanted was the eBay listing pics, with the caliper in the pic, as shown in this snippet of your posting pic.
    20200914-RE-141970-Float-02.jpg

    Anyway, took a snippet of your latest pic, showing your measurements.
    20200914-RE-141970-Float-01.jpg

    This float looks better than the CruzinImage floats I reworked. The float cells are a bit wider, and the crossbar attachment looks to be straight.

    For reference, here's the dims of my original 1971 OEM Mikuni BS-38 floats.
    XS1B-Carbs-OEM-Float.jpg

    And, the OEM float fitted into the carb body.
    Notice the clearances to the outer bowl walls and center jet block.
    CruzinImage-BS38-Floats09.jpg

    I looked up the RE 141970 floats on a Royal Enfield site, and found their reported outer width dimension to be 2.25" (57mm).
    20200914-RE-141970-Float-03.jpg

    There's other float offerings out there, like this 2FastMoto, made in Taiwan.
    20200914-2FastMoto-Float_eBay.jpg

    Then there's the Boats.net offering, showing a 2.5" (63mm) width.
    BoatsNet-BS38-Floats01.jpg BoatsNet-BS38-Floats02.jpg

    What I'm seeing here is a disturbing intermix of XS650, KZ750, RE-350 (and maybe others) floats out there in the aftermarket.

    Although they may physically fit into the float chamber, they'll have different bowl clearances and flotation.

    For anyone pursuing this "alternative" route, I'd strongly recommend:
    - Checking clearances to the bowl sides and center jet block.
    (At least 1.5mm clearances)
    - Set float/fuel level using the "clear tube method".
    - Be alert to unusually *rich* conditions.
    - Ensure that the final position/angle of the float valve 'tang' is perpendicular to the valve pin.

    BS38-BadFloatAngle.jpg

    Be careful out there. The market is awash with bogus stuff.

    Like tire pressure gauges that are off by 10psi.
    I know, I have 2 of them.

    Or digital multimeters that are off by 2 volts.
    I know, I have one of them.

    Or counterfeit spark plugs.
    I know, I have one of those, too...
     
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  14. Rasputin

    Rasputin XS650 Addict XS650.com Supporter

    Here are the photo dimensions from their listing.
    Item number. 143526019618
     

    Attached Files:

    TwoManyXS1Bs likes this.
  15. TwoManyXS1Bs

    TwoManyXS1Bs BBQ Hunter Top Contributor

    Thanx Rasputin.
    Those floats definitely look better than my CruzinImage floats.
    The float cells are larger, just slightly less than the OEM Mikuni floats.
    Recommend adding maybe 1-2mm to the float height settings as a starting point.
    Then double-check using the "clear tube method"...
     
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  16. Rasputin

    Rasputin XS650 Addict XS650.com Supporter

    Yes. I think they will be OK going to try them in a carb with petrol and check as you suggest.
     
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