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Questions about carburetors Yamaha zeal 250(FZX 250)

Discussion in 'Yamaha 250cc In-Line 4's' started by Yakob, Apr 8, 2014.

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  1. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    GreyImport, May 24, 2014
    #41
  2. ruckusman

    ruckusman White Mans Magic Master Premium Member Dirty Wheel Club

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    yeah it's all cool - with a float height of 16.2mm I had a fuel level of about the correct height

    Use float height first as a guide to what you have - then measure the fuel level
     
    ruckusman, May 24, 2014
    #42
  3. RosscoM

    RosscoM Active Member Premium Member

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    well that makes sense... derr... thanx Grey...
    just a thought... link non upgraded members to that when they click on the download button...

    Guess who is going to be checking float heights and fuel levels...
    Guess who is transferring $$ to PayPal to upgrade their membership here...

    did you fix the problem you were having in "my fizzer" thread, was it those pesky seat O-Rings...
     
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    RosscoM, May 24, 2014
    #43
  4. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    Actually I dont know wats the go there .... I thought it directed u to the premium member donation thing ....Kiffsta will jump in on that one ...wont ya mate?

    Its a work in progress ....sadly due to life theres been a bike hiatus for the last couple of months.
     
    GreyImport, May 24, 2014
    #44
  5. RosscoM

    RosscoM Active Member Premium Member

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    for me that would read "due to bike there has been a life hiatus"... when I got the first 250, 3ln1 blue, it ran like a pig, exup prob and the PO thought it was wise to put a piece of vapor hose between the diaphragm vents... hard to find when it looks standard... had he used garden hose it might have been obvious...
     
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    RosscoM, May 24, 2014
    #45
  6. Phil

    Phil Senior Member Contributing Member

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    Oh the joys of buying second hand. The criminal things people do to bikes, one of life's challenges.
     
    Phil, May 24, 2014
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  7. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    All FZR400s use the engine number 1WG. However, the term 1WG is widely used to describe the first series that were non-exup. Your profile lists yours as a 3EN1 (handy model identifier http://www.madsi.co.uk/models.aspx)
    The 1WG did not come with BDST carburettors. It came with BD. These are round slide carburettors and completely different to the BDST used on later models which have a square slide.
    Parts books and some manuals for the 400s are available on my web pages for the appropriate models.
    http://www.litetek.co/ReplacementPartsYamaha.html
    I produce and sell carburettor kits for the 400s and I can assure you that this information is correct. I also own a 3TJ1

    Yamaha never supplied a float height for the 250s that use BDST carbs. That value was determined by one of the members.
    To access the resources on this site you need to pay a fee. There is a thread that discusses why.

    The 2KR has a workshop manual available and I have previously posted an extract from the 3LN1 supplement but unfortunately it is in Japanese.
    I have attached the relevant page from the 1WG Manual which defines the carburettor type. You can download a manual for the 3TJ1 from my web page which has an incorrect image for your type of carburettors, also attached. 1WG_BD32.jpg
    3TJ1_FuelLevel.png

    cheers
    Blair
     
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    maelstrom, May 24, 2014
    #47
  8. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    Don't mind all my redundant information Rossco - I'm old :oops:
     
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    maelstrom, May 25, 2014
    #48
  9. Willrcr15

    Willrcr15 Well-Known Member

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    Rossco, I think most of us fixed the bad carby problem with the Litetek kits & in my case it was the inlet seat o ring, the whole kit made her run just perfect & still does. with old bikes it's just a process of elimination & carbies are the best place to start.
     
    Willrcr15, May 25, 2014
    #49
  10. ruckusman

    ruckusman White Mans Magic Master Premium Member Dirty Wheel Club

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    Just an FYI - my bike was sitting with foul smelling chemical residue in the carbs for 9 years before I got it, I've since replaced the needle seat valves and am using the larger o-rings.

    Lowered my fuel height to 1mm below the 9.2mm recommended in the 3ln1 supplement - I get good behaviour most of the time however I have observed - meaning actually measured a fuel level that fluctuates.
    I've spent 2 days installing a fuel pump, adjusting float heights then fuel levels then removing the pump again because it was overwhelming the floats.

    My tentative conclusion is that those 9 years bathed in noxious petrol fumes as the stuff decomposed has affected the rigidity of the floats. They do seem overly flimsy especially the side opposite the needle & seat valve, and prone to being overwhelmed by fuel pressure - notably over bumpy roads & speed bumps...which I occasionally slow down for...

    peace out
     
    ruckusman, May 25, 2014
    #50
  11. Yakob

    Yakob Member

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    I need to know information about size of 2kr carbs....anybody who have 2kr fzr write please.....
     
    Yakob, May 25, 2014
    #51
  12. kiffsta

    kiffsta Senior Member

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    Hey Rossco, its not a dumb reason, we locked it down a while back because people joined up , download a manual and not even say hi, I put a small fee in place for those who want to do that, this way the hosting costs are covered by those who eat and run :thumb_ups:

    I have given you access to the downloads as you have been active in the community

    Cheers

    Kiffsta
     
    kiffsta, May 25, 2014
    #52
  13. ruckusman

    ruckusman White Mans Magic Master Premium Member Dirty Wheel Club

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    f
    fuel level should be 9.2mm above the line cast on the float bowl

    If yours is much higher with the fuel pump installed - remove the pump and try it without the pump.

    I will barely run with a fuel level about 2mm too high, if the fuel level is much higher then it will not start and you may risk the fuel hydrolocking a cylinder

    I tried what was supposed to be the correct pump, which it wasn't, and the fuel level will be too high if the pump outputs too much pressure

    peace out
     
    ruckusman, May 25, 2014
    #53
  14. RosscoM

    RosscoM Active Member Premium Member

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    gee Kiffsta, you didn't have to do that, I was happy to pay $5 for the privilege... ;)

    Maelstrom, I had a look at the 400 carb pistons today, from the air cleaner side they look exactly the same as the 3LN just slightly larger, I took a photo... attached 400Carb.jpg
    ... they are flat on the air cleaner side, and 1/2 round on the base, someone could have changed them I suppose, but the picture from your site, the 3EN1 parts picture, they look the same. It's definitely a 3EN1 by the front fairing (twin headlights and vents above), the screen I had to get was 3EN1, and the chassis number.

    Ruckusman, my 3LN1 has never run a fuel pump, I do think the main pickup filter is blocked as it runs out unless I keep it on reserve(for the last 30,000 kms), but it gravity feeds well enough. It ticked over to 00000.0 today (service time) also need to redo a fork seal, they were re-chromed last June... just ordered a new rear brake light switch, I've cleaned it up before but this time she's a no goer... just did chain and sprockets (17/47)... pay rego this week...
     
    RosscoM, May 27, 2014
    #54
  15. ruckusman

    ruckusman White Mans Magic Master Premium Member Dirty Wheel Club

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    interesting - mine won't run via gravity feed without some sort of flow restriction in place - down to the floats needing replacement now
     
    ruckusman, May 27, 2014
    #55
  16. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    Sorry Roscoe, you lost me.
    Yes, yours is a 3EN1, not a 1WG.
     
    maelstrom, May 27, 2014
    #56
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