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Pinned Needles and needle jets/emulsion tubes - FZR250 Mikuni BDST28 Carurettors

Discussion in 'Yamaha 250cc In-Line 4's' started by GreyImport, Sep 17, 2016.

  1. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    Cold starts require fuel and a good spark. Together with your stalling issue it does not add up to the wrong size of emulsion tubes.
     
  2. ruckusman

    ruckusman White Mans Magic Master Premium Member Dirty Wheel Club

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    I think the accelerate wear rate is as a result of the hole in the slides wearing oval allowing the needle extra movement forwards and backwards which wears out the emulsion tubes more quickly as a consequence
     
  3. Gert

    Gert Well-Known Member

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    For four years ago, the needles could be ordered at Yamaha. I should have done that, but that is too late.
    I can imagen that those needles are somewhere, probably a company who does buy old stuff from Yamaha.
    Anyone ideas where those can be?

    I can try megazip, but I suppose the same thing is going to happen as with Impex.
    I mailed Impex if they are going to be so kind to they refund my money.
     
  4. driftwood

    driftwood Well-Known Member

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    @Joker (srsly, I know it's not funny anymore , coming in 3yrs late) but I too am after new tubes
     
  5. ruckusman

    ruckusman White Mans Magic Master Premium Member Dirty Wheel Club

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    Keyster kits from Motorcycle spares warehouse
    https://www.motorcyclespareswarehouse.com.au/search?q=FZR250+carb

    FWIW - I tried the kits from ebay/aliexpress and the actual holes in the emulsion tubes are 2.52mm not 2.59mm so I don't consider them close enough to correct spec to work properly and they will wear quickly

    I outlined the details in this thread
    https://www.2fiftycc.com/index.php?threads/alternative-carburettors-fzr250-3ln1.11370/
     
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    Last edited: Mar 22, 2022

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