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Project My Fizzer

Discussion in 'Your 250cc Projects' started by GreyImport, Sep 24, 2012.

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  1. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    I havnt done the valves .... its always been on my list as a possible cause.

    Heres a fuel level check (#2 doesnt have a drain screw)

    #1

    Fuel level carb 1.jpg

    #3

    Fuel level carb 3.jpg

    #4

    Fuel level carb 4.jpg
     
    • Like Like x 1
    GreyImport, Dec 14, 2013
    #421
  2. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    Well we can rule out anything heat related ..... I havnt touched it for days and starting it just then, it will only 'idle'

    :headbang:
     
    GreyImport, Dec 14, 2013
    #422
  3. willfzr2503ln

    willfzr2503ln Active Member

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    did you try burning off the fuel the way i said before
     
    willfzr2503ln, Dec 14, 2013
    #423
  4. willfzr2503ln

    willfzr2503ln Active Member

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    if thats the case that would explain the fuel sitting in my intake
    it was on the 4th carb and its the worst of myn , also the one with no drain screw
     
    willfzr2503ln, Dec 14, 2013
    #424
  5. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    Interesting .... I just let the starter run a bit longer than I normally would and it revs up ..... :aggressive:
     
    GreyImport, Dec 14, 2013
    #425
  6. sylvaner01

    sylvaner01 Member

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    when you start the bike sit on it, I find mine starts better when the bike is level, might be flooding the 4th carb or something.. idk, also check the valves.. its not that hard to do and might be the cause
     
    sylvaner01, Dec 14, 2013
    #426
  7. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    Ok float level looks good. Next!
     
    maelstrom, Dec 14, 2013
    #427
  8. willfzr2503ln

    willfzr2503ln Active Member

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    id like to know what it is when you get to the bottom off it , surely its the carbs
     
    willfzr2503ln, Dec 14, 2013
    #428
  9. ruckusman

    ruckusman White Mans Magic Master Premium Member Dirty Wheel Club

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    open and inspect your right handlebar switchblock - the run switch may have carbon buildup of corrosion

    peace out
     
    ruckusman, Dec 15, 2013
    #429
  10. willfzr2503ln

    willfzr2503ln Active Member

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    holding the starter will just be burning of fuel
    why the excess fuel is there or what the reason is that allows the bike to rev up after
    when we know this we will know our problem

    knowing its a fuel problem does anyone know carb operation well enough to diagnose why it wont rev up unless the fuel is burnt off

    does this all make sense
     
    willfzr2503ln, Dec 16, 2013
    #430
  11. sylvaner01

    sylvaner01 Member

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    Check spark plug wire order, kind of sounds like 2 and 3 might be mixed too
     
    sylvaner01, Dec 16, 2013
    #431
  12. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    Been reading all of the posts again, as you do. looking for clues.
    I missed something with Mr Ruckus' post about having the same problem. The part I missed is that he did not have his fuel pump in use at the time because he was using a small tank as the fuel supply. Therefore ruling out the fuel pump/supply issue.
    It needs to be given close attention.
    I think anything you can do to to bypass connections and switches would be worth trying.
    An intermittent partial fault, could there be anything worse?
     
    Last edited: Dec 16, 2013
    maelstrom, Dec 16, 2013
    #432
  13. ruckusman

    ruckusman White Mans Magic Master Premium Member Dirty Wheel Club

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    OK here's another clue for you - when I first got my bike I was chatting with one the guys t he local Bunnings, he was very helpful and full of info - anyway long story short he mentioned the side stand safety switch also.

    I didn't think much of the relevance at the time, but he said you have to get the side stand safety switch sorted properly, not just bypassed to get it running properly. I went back this afternoon to quiz him some more on this, but he doesn't work again till the weekend.

    The phenomenon I experienced was exactly the same and in my case it was electrical, so the side stand switch merits investigation

    peace out
     
    ruckusman, Dec 16, 2013
    #433
  14. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    More weird stuff. Why couldn't you just bypass the side stand switch? According to the 600 wiring diagram it is a simple earth switch that connects to the TCI unit.
    fzr600wiringdiagram.gif
    With all these circuits that affect the ignition unit/main relay, you would want to have very good earths on these parts.
     
    maelstrom, Dec 16, 2013
    #434
  15. willfzr2503ln

    willfzr2503ln Active Member

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    the pump is not causing the problem on my end , i have run the bike with no pump. at first i thought it was the pump but after a short time 15 min maybe , same problem

    im thinking its the carbs maybe floats maybe vacum
    having said that i know at least one of my clearances are out ( i can hear it)
    surely yamaha has accounted for some leeway in adjustments
    maybe everything has to be just right
    carbs
    clearances
    exup
    spark plugs health
     
    willfzr2503ln, Dec 16, 2013
    #435
  16. willfzr2503ln

    willfzr2503ln Active Member

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    neither is the kickstand , my electrics are all fine
     
    willfzr2503ln, Dec 16, 2013
    #436
  17. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    The CDI unit interacts with:
    Tachometer
    Pickup coil
    ignition coil
    clutch switch
    main relay
    engine stop switch
    kickstand switch
    fuel pump

    The Main Relay interacts with:
    fuel pump
    CDI unit
    engine stop switch
    start button
    clutch switch
    neutral light
    starter relay
    oil level switch
    neutral switch

    Mmm lots of dependancies there.
     
    maelstrom, Dec 16, 2013
    #437
  18. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    Well at least I have had a good look at a Yamaha wiring schematic. If I keep mine, I will rewire it and throw all of those 'accessories' in the bin. Especially that 'main relay'.
     
    maelstrom, Dec 16, 2013
    #438
  19. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    More fuel for the fire.
    This is for the 3TJ1. Now that means everything published to date has said below the line and everybody has found the level above the line. Also this says that you have to 'jack up the engine until the carburettor is vertical'.
    FuelLevel.png
     
    maelstrom, Dec 16, 2013
    #439
  20. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    Thats an interesting one ..... I did think about the positioning of the carbs as I had mine on a stand which of course raises the rear.
    Also 20mm below the line is alot of difference to 10 above it.
     
    GreyImport, Dec 16, 2013
    #440
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