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Thread: EFI

  1. #1
    GPHOTROD's Avatar
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    EFI

    #1 cyl top left is leaner than #2 top right is leaner than #3 bottom. What causes this, could my injectors be plugging up?
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    Last edited by GPHOTROD; 01-13-2008 at 05:23 PM.


  2. #2

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    Cool

    think you have it backwards #3 lean
    look
    http://www.bikemanperformance.com/tech_detail.php?ta=4

    later cd

  3. #3
    One day at a time..... N8R's Avatar
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    #3 is the worst and #2 does not look to good. EFI settings?? are you running free flow? or stock ss? did you run it low on fuel?(no comments Jim )

  4. #4

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    Quote Originally Posted by GPHOTROD View Post
    #1 cyl top left is leaner than #2 top right is leaner than #3 bottom. What causes this, could my injectors be plugging up?
    let's back up,any mod's?

    cd

  5. #5
    mtrager's Avatar
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    Turn the fuel up. It will work it self out.

  6. #6
    GPHOTROD's Avatar
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    Mods are.

    D plate
    Riva efi
    Free flow
    VF3 reeds
    Stock head milled 140-145 compression
    Sonic Booms

    EFI settings 5 1/2, 7, 3 1/2, 9
    These are o clock settings.
    Last edited by GPHOTROD; 01-13-2008 at 09:44 PM.

  7. #7
    Happily Self-Employed WFO's Avatar
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    Quote Originally Posted by GPHOTROD View Post
    #1 cyl top left is leaner than #2 top right is leaner than #3 bottom. What causes this, could my injectors be plugging up?
    I agree that #1 is leaner than #2, and #3 is the richest... but not in the danger zone yet IMO.

  8. #8

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    Quote Originally Posted by GPHOTROD View Post
    #1 cyl top left is leaner than #2 top right is leaner than #3 bottom. What causes this, could my injectors be plugging up?
    now looking at post all messup pix f**k up,something wrong here! 3-2-1? I see grease fitting in 1st pix(#3) and so on

    cd

  9. #9
    GPHOTROD's Avatar
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    Chip you have them backwards the pic with the grease fitting is #3

  10. #10
    The 3.5 setting on your #3 efi pot is rich.. With your mods you should be able to run your #3 efi pot at 1. If that makes you nervous then use 1.5..
    5-5-1-6 is what works well from my experience..

    Exhaust temps on a non ported 1300 at 4500 rpm are 1200 degrees, and at WOT with # 3 pot set at 1, they are just 1065 degrees.
    Most of these engines lean out and overheat in the midrange rpms.

    I was reading plugs, thinking mine was good at #3 also, then started leaning it out and watching the EGT and tach, and gained almost 100 rpms from dropping #3 all the way to 1..
    That was 15 hard engine hours ago...

    Take your injectors out, have them cleaned and flowed, then put the highest flow rate injector in number 3.

    The only variable in fuel flow, from injector to injector, on an EFI engine is the injector itself.
    There also is no fuel filter on these engines, only a sock at the fuel pump pickup, and a small screen at the injector inlet. So if anything is going to clog or restrict, it will be the injector..
    Last edited by rossnemo; 01-13-2008 at 10:28 PM. Reason: spelling

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