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Help FZR 250 2KR Carb rebuild

Discussion in 'Yamaha 250cc In-Line 4's' started by Slugger, Jun 21, 2016.

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  1. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    2KR do not use BDS carbs so different diaphragms
    How about the English company whose name I forgot, NRP or something like that. It is going to cost though.
     
    maelstrom, Jun 27, 2016
    #41
  2. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    GreyImport, Jun 27, 2016
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  3. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    my67xr, Jun 27, 2016
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  4. Slugger

    Slugger Active Member

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    Really? What model carb do i have then?

    I have the Japanese manual for the bike, written in Japanese, and on it, it has a code "4DV1", but this is the jet needle number, and no other code i can decipher. I thought i did read somewhere that this bike had Mikuni BDS26 carb.
    ?????
     
    Slugger, Jun 27, 2016
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  5. Slugger

    Slugger Active Member

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    @maelstrom , I actually read it on the Japanese manual i have. The manual is in Japanese, and it is for the first of the FZR250 series.
    Chapter 2 quotes the carb as a BDS26. I can upload this chapter, or even the whole manual if @GreyImport wants it.
     
    Slugger, Jun 27, 2016
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  6. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    Sorry, Slugger I may have my nomenclature wrong there. In any case the 2KR series carbs are not the same as the 3LN1 to 3LN7 which use BDST carbs. The diaphragm assembly that Mr Grey linked to looks to be the correct one for you. Have to hope that the slide cutaway is the same or that the rubber is removable.
     
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    maelstrom, Jun 27, 2016
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  7. Slugger

    Slugger Active Member

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    Thanks. Do you mean the link for the Hyosung Diaphram that Mr Grey linked to? Part number 13338HG5100 ?
     
    Slugger, Jun 27, 2016
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  8. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    Yes. The diaphragm will be the same. Only the slide could be different.
     
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    maelstrom, Jun 27, 2016
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  9. Slugger

    Slugger Active Member

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    Had a look on this site. Seems they have diaphragms, but they are loose. They do not come with the slide.
    Is this hard to pull apart, to take the old diaphragm off the slide, and fit the new one?
    Has anybody done this? are there any special tools or hints in doing this?
    upload_2016-6-28_20-9-40.jpeg
     
    Slugger, Jun 28, 2016
    #49
  10. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    this is from a 3LN BDST28 .... its of course different but yours would just be sitting in the groove and should come out with a little gentle persuasion....hold it with thumb and finger either side from the centre and slowly stretch it outwards to start it off

    IMGP7151 (Small).JPG IMGP7154 (Small).JPG
     
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    GreyImport, Jun 28, 2016
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  11. Slugger

    Slugger Active Member

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    So, pull out the rubber diaphragm from the shaft? What about the plastic (orange-ish) ring? The one in your picture looks like it has a break in it. It looks like mine doesn't have any breaks and is solid all the way around and looks like it is clamped on to the shaft.

    And another idea.. If the Hyosung diaphragm is the same size (refer earlier post from @maelstrom ), then it might be cheaper to buy the Hyosung one at $40 and take that one off and put on mine, rather than the one from NRP at 39 Pounds Sterling (about AUD$80) from NHP. ?
     
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    Last edited: Jun 28, 2016
    Slugger, Jun 28, 2016
    #51
  12. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    I cant really tell if yours is held in by the orange plastic part .... that clip on mine is loose and comes off very easily

    The Hyo part sounds the cheaper option but then if the slide is different will it come apart to swap with yours? ..... it may be pressed together as u say and may explain why its sold as a set

    Does yours look like this on the other side? .... does your slide look like this?

    13338HG5100.jpg
     
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    GreyImport, Jun 28, 2016
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  13. Slugger

    Slugger Active Member

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    Yep, something like that..

    upload_2016-6-28_21-8-50.jpeg
    upload_2016-6-28_21-10-0.jpeg

    It's the top part that worries me.. That orange plastic thing doesnt have a break in it at all..
    upload_2016-6-28_21-11-45.jpeg
     
    Slugger, Jun 28, 2016
    #53
  14. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    Put the tip of your thumb here on 1 side and your finger on the other side and grip it as close as possible to the inner ring and see if it will stretch out of the groove

    groove.jpg
     
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    GreyImport, Jun 28, 2016
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  15. Slugger

    Slugger Active Member

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    Ahhhh, no. It is on tight, and there doesn't seem to be any elasticity when i pull on it. I didn't want to pull too hard in case i rip the thing. But, on the NRP SITE, IT HAS THIS QUOTE:
    "Mikuni BDS26 carbs. *Diaphragm is 62mm OD*, and has a hole for the jet located in the tab on outer edge of the diaphragm [in the carb top]. Loose diaphargm supplied for self-fitment. Uses the same system as the original diaphragm, do NOT cut the plastic rings. Hints and tips sent with order. Viton FKM rubber, not affected by Ethanol in modern fuel. Sold each"
     
    Slugger, Jun 28, 2016
    #55
  16. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    Thats interesting .... we just need the 'hints and tips' :D

    Expensive experiment
     
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    GreyImport, Jun 28, 2016
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  17. Slugger

    Slugger Active Member

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    Yep.

    I may have to make the sacrifice for the team....
     
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    Slugger, Jun 28, 2016
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  18. Slugger

    Slugger Active Member

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    Well, i have made the sacrifice !!!!!!

    I have ordered a loose diaphragm from NRP today. Bloody expensive. :mad: I only ordered one, so this will go down to "research costs".

    Anyway, knowledge costs money i say, so i hope my investment will be worth it. I will now wait until it comes, and see how it all works.
    Hopefully i can post good news soon which might be helpful for others in the future.

    (these carbs are costing a fortune....:headbang::headbang::headbang:)
     
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    Slugger, Jun 30, 2016
    #58
  19. Felipe FZR250

    Felipe FZR250 Member

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    Felipe FZR250, Jul 1, 2016
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  20. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    maelstrom, Jul 1, 2016
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