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.

Page 9 of 9
  1. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

    Messages:
    5,117
    Likes Received:
    3,481
    Trophy Points:
    1,148
    Location:
    Thailand
    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.
     
    maelstrom, Nov 15, 2020
    #161
  2. ruckusman

    ruckusman White Mans Magic Master Premium Member Dirty Wheel Club

    Messages:
    3,274
    Likes Received:
    1,435
    Trophy Points:
    918
    Location:
    Narrabeen, NSW Australia
    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
     
    ruckusman, Nov 15, 2020
    #162
  3. Gert

    Gert Well-Known Member

    Messages:
    125
    Likes Received:
    123
    Trophy Points:
    248
    Location:
    The Netherlands
    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.
     
    Gert, Nov 17, 2020
    #163
  4. driftwood

    driftwood Well-Known Member

    Messages:
    102
    Likes Received:
    41
    Trophy Points:
    213
    Location:
    melbourne
    @Joker (srsly, I know it's not funny anymore , coming in 3yrs late) but I too am after new tubes
     
    driftwood, Mar 22, 2022
    #164
  5. ruckusman

    ruckusman White Mans Magic Master Premium Member Dirty Wheel Club

    Messages:
    3,274
    Likes Received:
    1,435
    Trophy Points:
    918
    Location:
    Narrabeen, NSW Australia
    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/
     
    • Like Like x 2
    Last edited: Mar 22, 2022
    ruckusman, Mar 22, 2022
    #165
Page 9 of 9

Share This Page