Spark Plug Lean ?

Discussion in 'Bonneville' started by Skidmarx, Feb 19, 2021.

  1. Skidmarx

    Skidmarx New Member

    May 27, 2020
    21
    3
    New Zealand
    #1 Skidmarx, Feb 19, 2021
    Hey team, you thoughts on my sprakplug condition... lean or just right ?

    2018 t120 with x-pipe, aftermarket mufflers + K&N air filter.

    If on the lean side, thinking of adding a booster plug to my farkles

    how say you experts ?

    lea..jpg
     
  2. Pegscraper

    Pegscraper Elite Member

    Jun 12, 2020
    3,490
    800
    Yorkshire
    #2 Pegscraper, Feb 19, 2021
    That looks normal to me, modern engines are designed to run very lean compared to years ago when carbs were the norm and not all the electronically managed jiggery pokery.
    I checked the plugs on my Z at 20k and they looked hardly used.
     
  3. Skidmarx

    Skidmarx New Member

    May 27, 2020
    21
    3
    New Zealand
    #3 Skidmarx, Feb 20, 2021
    I shall share a n important piece of information....

    The workshop manual says the ECM re-learns (Engine adaption) & air/fuel etc adjusts automatically for additions (de-cat/x-pipe, after market mufflers + K&N air filter) so happy days..

    My sparkplug is a prime example of what sparkplugs should look like.

    MWJOE9631.JPG
     
  4. Pegscraper

    Pegscraper Elite Member

    Jun 12, 2020
    3,490
    800
    Yorkshire
    #4 Pegscraper, Feb 20, 2021
    Only within certain parameters. I've fitted a "fuel booster" plug to my standard Street Scrambler. I did this to see if it would cure an intermittent hot engine stall when pulling away from idle and it has.
     
  5. Skidmarx

    Skidmarx New Member

    May 27, 2020
    21
    3
    New Zealand
    #5 Skidmarx, Feb 20, 2021
    Last edited: Feb 21, 2021
    This is good to know... I tried a 'Booster plug' prior to adding a K&N air filter yesterday (to try & fix a snatchy low speed throttle) but didn't make any difference ... funny enough.. the K&N air filter did.
    p.s. I don't have any stalling probs
     
  6. Jadorff

    Jadorff Noble Member

    Apr 14, 2019
    879
    443
    Adelaide Australia
    #6 Jadorff, Feb 23, 2021
    looks good to me
     
  7. Cupoftea

    Cupoftea Noble Member

    Dec 16, 2018
    570
    343
    NEW FOREST
    #7 Cupoftea, Feb 25, 2021
    My T120 has decat, remus pipes no baffles, k&n filter. Fitted a booster plug, all good.
     
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