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Help FZR250 - coolant leak in hardline behind block/head

Discussion in 'Yamaha 250cc In-Line 4's' started by skylinerd1, May 4, 2019.

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  1. skylinerd1

    skylinerd1 Member Premium Member Contributing Member

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    So I have one 3LN1 carb and the other three are late model carbs? Can someone else confirm that?

    Litetek: can you hold those parts for another day or two while I work out what these carbs are?
     
    skylinerd1, May 6, 2019
    #21
  2. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    They are not 3LN1 carbs .... later models had the extended idle knob cable

    You will have to look at the jet housing to tell on each individual carby to be sure as the bowls could have been swapped out possibly

    Jet housings difference.jpg float bowls.jpg Idle knob.jpg
     
    GreyImport, May 6, 2019
    #22
  3. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    Might have had the fuel bowl or fuel bowl's replaced at some stage?
    The main thing to look at is what shape the jet housing is in each carby

    Neither set of my 3LN3 carby's have those 2x round raised bit's in the fuel bowl casting's

    20190506_115952.jpg 20190506_115959.jpg
     
    • Well said! Well said! x 1
    Last edited: May 6, 2019
    my67xr, May 6, 2019
    #23
  4. skylinerd1

    skylinerd1 Member Premium Member Contributing Member

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    ok I get it now. I'll go pull the tank off and take some pics.
     
    skylinerd1, May 6, 2019
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  5. skylinerd1

    skylinerd1 Member Premium Member Contributing Member

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    Do I need to remove the remainder of the airbox? Where is that jet housing bit on them?

    IMG_20190506_145832[1].jpg IMG_20190506_145838[1].jpg IMG_20190506_145853[1].jpg
     
    skylinerd1, May 6, 2019
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  6. skylinerd1

    skylinerd1 Member Premium Member Contributing Member

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    So these are most likely 3LN6/7 carbs with one having a earlier float bowl on it. But I will likely have to pull them all apart to know for sure?
     
    skylinerd1, May 6, 2019
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  7. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    Yeah look's like they are 3LN6 3LN7, or FZX250 Zeal, as they have cutaway's on the front of the each slide
    The jetting is different to 3LN3 3LN5, as well
     
    my67xr, May 6, 2019
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  8. skylinerd1

    skylinerd1 Member Premium Member Contributing Member

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    So im best just to do the correct seal kit and replace internals on a case by case basis.

    Sounds like these have less issues than the earlier ones.
     
    skylinerd1, May 6, 2019
    #28
  9. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    If they are 3LN6-7 carbs then that is good for you because Yamaha made some effort to fix the wear problem caused by vibrating needles. I will hold your order until you get this sorted. You can message someone in a post by just puting an @ in front of the username, like this @skylinerd1
     
    maelstrom, May 6, 2019
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  10. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    @skylinerd1 Please post the pic of your fuel tap here and the guys can identify it. I will refund your purchase of the carb kit and you can order the correct one
     
    maelstrom, May 6, 2019
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  11. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    my67xr, May 6, 2019
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  12. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    Post the pic of your fuel tap. I have already refunded you for the carb kits A & B so you can order the correct ones now.
     
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    maelstrom, May 6, 2019
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  13. skylinerd1

    skylinerd1 Member Premium Member Contributing Member

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    I'll do both. I will remove them tomorrow my time to see what they are.

    IMG_20190506_160441[1].jpg
     
    skylinerd1, May 6, 2019
    #33
  14. Linkin

    Linkin The Mechanic Premium Member Contributing Member Dirty Wheel Club

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    That's a 2GH fuel tap, the older style
     
    Linkin, May 6, 2019
    #34
  15. skylinerd1

    skylinerd1 Member Premium Member Contributing Member

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    So heres where im upto now. Carbs deff dirty. Fuel tap internal pics: = FT-003 & OR-048 Which is the correct O ring for that tap the 48 or the 49 litetek part number?

    So the jet units are 3ln3/5/6/7 but most likely 6/7 parts given the markings on the rest of the carb bodies?

    Also a pic showing the timing chain tensioner. About 6-7mm out. So im thinking the chain is fine. Can valve clearances cause a solid ticking noise? It has only done it when I idled it up the driveway almost off throttle. It sounds normal when reving and when I drove it down the road other than bogging down with no power most likely due to the state of these carbs and the exup valve I think.

    So parts I need so far.
    I noticed the throttle return cable was snapped.
    Exup cables.
    valve cover gasket. This is proving more difficult to source than I thought.
    Timing chain tensioner gasket (I can probably just make that one).
    Litetek carb kit to suit.
    Fuel tap seals.
    Fuel hose. Litetek?
    Fuel filter.


    IMG_20190507_123028[1].jpg IMG_20190507_125600[1].jpg IMG_20190507_125608[1].jpg IMG_20190507_130750[1].jpg IMG_20190507_124147[1].jpg
     
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    skylinerd1, May 7, 2019
    #35
  16. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    Just sold out of fuel hose over the weekend. All the rest is available.
    FuelTap_O-Ring_FT-003.jpg
    There is a mountain of stickied, tech information at the beginning of the Yamaha 4 cyl thread.
     
    maelstrom, May 7, 2019
    #36
  17. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    Have a look at the main and starter jet .... often they are wrong or in the wrong place
    At least with those carbs u wont have the problematic emulsion tubes/needles

    BDST 28 carb chart.PNG

    CarbNeedleAssembly 6-7.jpg

    MikuniEmblem2.jpg
     
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    GreyImport, May 7, 2019
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  18. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    Get a FZX250 Zeal (Australian delivered, possibly NZ too ?) valve cover gasket from your local Yamaha dealer
    1HX-11193-00
    https://www.impex-jp.com/catalogs/moto/yamaha/fzx250/3yx2-1992-maple-red-mpr-00eg-japan-3032/bracket-engine-127374.html


    Timing chain tensioner gasket- 3YX-12213-00 personally i'd just make one
    Don't forget to reset the tensioner before you fit it too, and don't turn the engine over while it's out either


    And when you pull apart any carby's, make sure you wipe all the rubber seal's with a clean dry rag as the rubber's can swell and make it hard to put back together.

    Smearing the rubber seal's with Silicon grease can help to keep them soft and they'll last longer too.
    Use it on your rubber intake manifold's and airbox boot's to help preserve them and help's to locate them when refitting the carby's
    https://www.supercheapauto.co.nz/p/herschell-herschell-silicone-paste-grease-tube---100g/402033.html#q=silicon%2Bgrease&lang=en_NZ
    SCA_402033_hi-res.jpg
     
    my67xr, May 7, 2019
    #38
  19. skylinerd1

    skylinerd1 Member Premium Member Contributing Member

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    This appears to be a zeal carb set?..... Should I try to source a 3LN6/7 carb set or doesnt it really matter?

    So the needles are on clip #2
    Starter jet 42.5
    Main jet 90 (next to starter jet in jet housing.

    All the plastic bits on the needle look nothing like the 3LN6/7 pic above?

    What you guys reckon?

    IMG_20190507_164923[1].jpg IMG_20190507_165012[1].jpg IMG_20190507_165026[1].jpg
     
    skylinerd1, May 7, 2019
    #39
  20. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    Better check to see if it is a Zeal engine too.
    Leave needle clip on the middle position until you have the bike running reasonably well.
    I have fully refunded your purchase now so you can order again when you have it sorted.
     
    maelstrom, May 7, 2019
    #40
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