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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. Yakob

    Yakob Member

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    Hi guys! I have Yamaha zeal, and I need to know size of fuel jets( different in each carburetor or no). I dont know how tune in fuel level( in the manual written 10,5 mm from line. Which line??Thanks for answers)) I am from Russia and my English very very bad)))
     
    Yakob, Apr 8, 2014
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  2. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    Don't worry about your English Yakob, your doing great.
    I believe the general consensus is this line.
    GreysLine.png
    This comes from the thread MyFizzer by Mr GreyImport. It is a very long read.
    cheers
    Blair
     
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    maelstrom, Apr 8, 2014
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  3. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    Zeal carby specs

    zeal carb specs.png
     
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    GreyImport, Apr 9, 2014
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  4. Yakob

    Yakob Member

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    Thanks a lot) I hope it's true )My carburetor little different but line there. I can share photo.

    Thank you!
     
    Last edited by a moderator: Apr 9, 2014
    Yakob, Apr 9, 2014
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  5. Revolver

    Revolver Big Member Premium Member

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    He isn't doing great, his English skills are better than most people who "speak" English! Especially on forums!
     
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    Revolver, Apr 19, 2014
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  6. Yakob

    Yakob Member

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    Thanks, but my English really bad, I use google translator, with my little corrections
     
    Yakob, Apr 19, 2014
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  7. Yakob

    Yakob Member

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    Help me please! I dont know how tune float (interested manual adjustment)
     
    Yakob, Apr 20, 2014
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  8. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    GreyImport, Apr 21, 2014
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  9. Yakob

    Yakob Member

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    Thanks a lot, but may be is there another way like the picture? the level adjust as line izt6lmDle64.jpg
     
    Yakob, Apr 22, 2014
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  10. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    Float height and fuel level are 2 different things but acheive the same outcome ...the correct amont of fuel stored in the bowl.

    That post I linked shows float height
    The picture u posted is the line for fuel level .... which in my thread I linked is discussed at length as well.
     
    GreyImport, Apr 22, 2014
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  11. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    maelstrom, Apr 22, 2014
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  12. Yakob

    Yakob Member

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    Yakob, Apr 23, 2014
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  13. Willrcr15

    Willrcr15 Well-Known Member

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    What problems are you having ?
    There's a good thread in here somewhere that'll you'll find helpful if your having carb issues.
    We found that the O ring around the fuel inlet seat is easily overlooked & they leak causing flooding or rich running problems.
    There's an easy fix, buy the Lite Tek carb kit & you've at least ruled out a big factor.
    Don't mess with the floats just yet, they might be right, especially if they all measure the same heights.
     
    Willrcr15, Apr 23, 2014
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  14. ruckusman

    ruckusman White Mans Magic Master Premium Member Dirty Wheel Club

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    I

    I will be measuring the float height of my carburettors again this week. I will also be setting the fuel level.

    Float height is a coarse measurement and adjustment.
    Fuel level is a much more precise measurement and adjustment.

    I'll take some pictures and write a detailed description when I do.

    What height are your floats at and are they just touching the needle valves?

    Are all four floats at the same height measurement?

    Sorry for making it overly simple fellas, hoping Yakob can get the gist of what I'm saying, if not he hopefully stands a chance with google translate

    peace out
     
    ruckusman, Apr 23, 2014
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  15. Yakob

    Yakob Member

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    Thanks Ruskus, I will be waiting your instruction..
     
    Yakob, Apr 23, 2014
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  16. Yakob

    Yakob Member

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    Today I did the measurements, the distance to the corner of the float is approximately 10.5 mm instead of 16(like Ruskus), and the fuel level with 20 mm above the line on the cover of the float chamber.
     
    Yakob, Apr 24, 2014
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  17. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    Well please let us know what happens when you change the settings Yakob.
     
    maelstrom, Apr 24, 2014
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  18. Willrcr15

    Willrcr15 Well-Known Member

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    I'm having trouble with a GSXR flooding carburettor at the moment, a new set of needle & seats arrived yesterday & I installed them, checked the float heights & they were out by about 2.5mm so I set them to 7mm & it ran badly. I'll be resetting them to 9mm, where I found them, tonight & fingers crossed it goes.
    I didn't think they'd be so critical but it must be just enough to drown a jet or something.
    The recomended setting is actually 8mm +/- 1mm, so we'll see.
    Yours is way out, 10.5 to 16mm, wonder it runs, that'll make the fuel level very high in the bowl's won't it ?
    Wonder if your climate has anything to do with running a high setting? I had a look where you are & it looks like it could get cold there, our temp range here is about 13 to 30C & we're at sea level.
     
    Willrcr15, Apr 24, 2014
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  19. Yakob

    Yakob Member

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    Today I did measurements of the fuel level.In the photo my real fuel level in my carb, he is too high, right? Must be 10.5 mm above the line?I still can not start the bike and check out how it works, the battery died. But all of these tests, I started because of the fact that the motorcycle did not start... 2.jpg
     
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    Yakob, Apr 25, 2014
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  20. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    100% correct Yakob. But that level is so high that I think you should remove the spark plugs to check that the fuel has not been flooding into the cylinders. If that happens it can cause a hydraulic lock and can cause serious engine damage.

    Remove the plugs, turn ignition OFF, put the motorcycle in first gear and push it down the street to pump out any fuel out that may be in the cylinders. Do NOT do this with the engine switched on because it can start a fire.
     
    Last edited: Apr 25, 2014
    maelstrom, Apr 25, 2014
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