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Help Help identifying carburetors

Discussion in 'Yamaha 250cc In-Line 4's' started by Trainwreck, Oct 23, 2016.

  1. Trainwreck

    Trainwreck Member

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    Hello guys from the USA. I got my hands on a set of carbs that came with a large cache of parts and can't put my finger on what they came from. They are 26mm Mikuni CV downdraft type with a mechanical pull enricher.
    Any ideas?

    20161022_113851_resized.jpg 20161022_113856_resized.jpg 20161022_113903_resized.jpg 20161022_113908_resized.jpg 20161022_113915_resized.jpg
     
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    Trainwreck, Oct 23, 2016
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  2. Woolfe

    Woolfe Member

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    Looks like they could be off an fzr or fzx.

    Sent from my GT-I9505 using Tapatalk
     
    Woolfe, Oct 23, 2016
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  3. Woolfe

    Woolfe Member

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    These are the carbs off my 1998 fzx250 zeal

    [​IMG][​IMG]



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    Woolfe, Oct 23, 2016
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  4. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    They're Mikuni BDS26's but sorry not sure what bike use's a pull choke like that

    @Woolfe , those carby's are Mikuni BDST28's off a 3LN6 or 3LN7 FZR250 or FZX250 Zeal
     
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    my67xr, Oct 23, 2016
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  5. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    Just looked on the net and i reckon they're off a Yamaha XJ600.
    You'd have to compare the main, pilot and starter jet sizes to work out what year bike they are off.
     
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    my67xr, Oct 23, 2016
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  6. Linkin

    Linkin The Mechanic Premium Member Contributing Member Dirty Wheel Club

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    That design with the choke bolted onto the carby bowl is exactly what the 3LN6/7 have. Measure the inner diameter of the throttle body where the carbs sit in their boots. 28.5mm = FZR250R, if they are 26.5mm then they're from a Zeal.

    Also take a bowl off and check the jet sizes, that will tell you for sure.

    Then take diaphragm cap off and look at how the needle is held in. Black plastic spacer under needle and cap with spring screwing into the slide is the FZR250R design.
     
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    Linkin, Oct 24, 2016
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