Spark Plug Pictures

Discussion in 'Trials' started by alpineboard, May 13, 2018.

  1. alpineboard

    alpineboard Been here awhile

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    NGK BPR7ES, with 8 hours run time, Motul 710 IMG_1004.JPG
    #1
  2. 2whlrcr

    2whlrcr gooligan

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    [​IMG]
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  3. lineaway

    lineaway Long timer

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    What fuel?
    #3
  4. alpineboard

    alpineboard Been here awhile

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    1 part VP16 (116 oct) Plus 4 parts 91 eth free pump gas. = 96 oct

    Or

    1 part Sunoco Supreme 112 Plus 3 parts 91 eth free pump gas = 96 oct

    Either mix used plug looks similar.
    #4
  5. lineaway

    lineaway Long timer

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    Plug looks way better than mine, but running junk pump gas with the spark arrestor. The arrestor just gives too much back pressure. But my bike does run gooood.
    #5
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  6. Brewtus

    Brewtus Buffoonery, Inc.

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    Pick one, got 8 racks of 'em...

    20180513_144359.jpg

    :lol3
    #6
  7. Norman Foley

    Norman Foley Devotee of the Husqvarna

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    I loved my old Italian Husky manuals, which the literal translation for spark plug from Italian was..... The stick which lights the fire! :D
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  8. heffergm

    heffergm Long timer

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    That's a pretty good literal translation... 'candela' is spark plug in Italian. You can probably guess where the word originated (obviously it also has more than one meaning).
    #8
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  9. Bronco638

    Bronco638 Nobody Home

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    Is it me or does that plug, in the original post, look like it's slightly rich? I'm basing that on the color of the insulator and the spark tip, not the color of the electrode (which looks good, to me).
    #9
  10. lloyd193

    lloyd193 n00b

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    #10
  11. lloyd193

    lloyd193 n00b

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    The photo appearance of the plug does look rich, However to get an accurate indication, It is necessary to operate at wide open throttle under load for at least 10 seconds, Then turn off the ignition, Close throttle then visually inspect the plug. The insulator around the center electrode should appear bleached white to a very Slight tan. Make adjustments in small steps, A too lean engine will transfer Metal. A slightly rich Mixture aids in cooling the engine at W.O.T..
    #11
  12. heffergm

    heffergm Long timer

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    The last time a trials motor operated at >10 seconds WOT was the last time someone detonated one after a getoff without a lanyard.
    #12
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  13. Norman Foley

    Norman Foley Devotee of the Husqvarna

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    :photog
    #13
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  14. motobene

    motobene Motoing for 46 years

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    Bougie (candle) in French.

    That was a clean running engine to have such a nice plug, bun 8 hours isn't much run time. I expect a plug to last years, even the life of a bike with a cleaning every few years. If it needs it:-)
    #14