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Thread: Spark plug feedback

  1. #1
    Senior Member HKLBRY's Avatar
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    Spark plug feedback

    This is my first time pulling the spark plug on my 2103 TW, (3100 miles) and haven't done any spark plugs before on any vehicle (never needed too).

    Looking at my spark plug can I get some feedback as to how it looks?

    OK? Too Lean? Too rich? If too lean or rich, should I make any adjustments? And what adjustments should I make?

    I am currently running a Jet Kit and have it set up as ProCycle's starting point setup of a #122.5 Main Jet, #34 Pilot Jet, and 1 shim.

    image.jpg image.jpg

    Thanks for the advice, Dan
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  2. #2
    Super Moderator littletommy's Avatar
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    A top view would help seeing it better, but from what I can see, it's not too lean nor too rich. If the bike runs well, leave it right there.
    Peterb likes this.
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    Super Moderator littletommy's Avatar
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    Does it start and warm up quickly and has good response, no flat spots? From start to wide open on the road?
    1st John 1:9
    If we confess our sins, He is faithful and just to forgive us our sins, and to cleanse us from all unrighteousness.

    John 3:16
    For God so loved the world, that he gave his only begotten Son, that whosoever believeth in him should not perish, but have everlasting life.

    John 3:17
    For God sent not his Son into the world to condemn the world; but that the world through him might be saved.

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  5. #4
    Super Moderator littletommy's Avatar
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    Ok. Personally, I'd like to see it just a touch richer.
    Fred likes this.
    1st John 1:9
    If we confess our sins, He is faithful and just to forgive us our sins, and to cleanse us from all unrighteousness.

    John 3:16
    For God so loved the world, that he gave his only begotten Son, that whosoever believeth in him should not perish, but have everlasting life.

    John 3:17
    For God sent not his Son into the world to condemn the world; but that the world through him might be saved.

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  6. #5
    Super Moderator littletommy's Avatar
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    Hopefully, you did a plug chop on it. Ran it for about a mile WOT , hit the kill switch, pull the clutch? Yank the plug, check?
    jeffrolives likes this.
    1st John 1:9
    If we confess our sins, He is faithful and just to forgive us our sins, and to cleanse us from all unrighteousness.

    John 3:16
    For God so loved the world, that he gave his only begotten Son, that whosoever believeth in him should not perish, but have everlasting life.

    John 3:17
    For God sent not his Son into the world to condemn the world; but that the world through him might be saved.

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  7. #6
    Super Moderator littletommy's Avatar
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    More accurate.
    1st John 1:9
    If we confess our sins, He is faithful and just to forgive us our sins, and to cleanse us from all unrighteousness.

    John 3:16
    For God so loved the world, that he gave his only begotten Son, that whosoever believeth in him should not perish, but have everlasting life.

    John 3:17
    For God sent not his Son into the world to condemn the world; but that the world through him might be saved.

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  8. #7
    Super Moderator littletommy's Avatar
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    You probably don't need to go a mile, perhaps a half a mile. Take it briskly through the gears, ending up in 5th and WOT for a good little bit, then kill it, yank the clutch in, pull the plug, put in a spare, head home and look at it closely and go from there.
    admiral likes this.
    1st John 1:9
    If we confess our sins, He is faithful and just to forgive us our sins, and to cleanse us from all unrighteousness.

    John 3:16
    For God so loved the world, that he gave his only begotten Son, that whosoever believeth in him should not perish, but have everlasting life.

    John 3:17
    For God sent not his Son into the world to condemn the world; but that the world through him might be saved.

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  9. #8
    Super Moderator littletommy's Avatar
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    You want to get a good light and look down on the side of the insulator. You want to see a chocolate brownish ring down there. (A correct plug chop would entail cutting some of the threads off so you could really see, that's why they call it a plug chop, but try a good light first. The color might be instantly recognizable.) If it is that color (chocolate brown) or a tiny bit darker, the main jet is right. If it is lighter colored than that or whitish, it's too lean and you need a richer main.

    You can check the shimming on the needle (flat spot mid throttle) the same way if you do your plug chop exactly halfway between off throttle and WOT. If it's light colored, you need one more shim or more. If it is chocolate colored or a tiny bit more, it's probably correctly adjusted.

    Better on the slightly rich side, than lean.

    Hope that helps, keep us posted.

    Carb adjustments should be the last thing you do as far as adjusting and tuning on the engine. So, in other words, the valves would have been adjusted, the air filter serviced, new gas filter, stuff like that.
    Last edited by littletommy; 06-11-2015 at 10:56 PM.
    admiral likes this.
    1st John 1:9
    If we confess our sins, He is faithful and just to forgive us our sins, and to cleanse us from all unrighteousness.

    John 3:16
    For God so loved the world, that he gave his only begotten Son, that whosoever believeth in him should not perish, but have everlasting life.

    John 3:17
    For God sent not his Son into the world to condemn the world; but that the world through him might be saved.

    Hidden Content <<<Click here. Hidden Content

  10. #9
    Super Moderator Purple's Avatar
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    I did look it up on google images to begin with - this is the shortened version

    plugs.JPG

    The long version is here http://www.motorcycleinfo.co.uk/reso..._condition.jpg

    But as Littletommy says - after a while you'll do your head in trying to diagnose a plug too far - if it works fine, leave it alone. I spent ten years on two-strokes, as much time pulling plugs as anything else - don't get me started on dialing in heat values for triples ..........

    I applaud your curiosity - but your plug looks fine ..............
    jeffrolives and admiral like this.
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  11. #10
    Senior Member GaryL's Avatar
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    The ceramic which is the white part surrounding the electrode should have a light toast color as shown in the above Carbureted photo. Too white is too lean and too dark is too rich. I would try to richen your bike just a tad as LT said and leave it alone.

    GaryL
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