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Thread: Spark Plug Color Reading Chart

  1. Quickonstep
    Quickonstep is offline Registered User At the back of the pack
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    Spark Plug Color Reading Chart

    I have seen this come up a few times in the past few days and havent seen anything about it tech wise on this site, so here is a little contribution to the site. Enjoy!

    The First picture is of a normal plug, how it should look if it is jetted properly.

    The second picture is your plug if your engine is running to rich. Jet down a a little to correct.

    The third is a fouled plug. This happens becuase you have a crank case leak, blowby, dirty air filter, low compression, eccessive low rpm operation.

    The forth is of your plug if your machine is running too lean. Jet up a little to fatten up the mixure, or make sure the timing is set right.. This is also a tattletale of overheating.

    The last image is of a plug that has deposits on it.. not so much to worry about in a 4 stroke, but in a 2 stroke it happens due to bad oil, wrong mixture (premix) or dirt going past the air filter.

    Hope yall can use this.
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  2. Yamahauler's Avatar
    Yamahauler
    Yamahauler is offline Power User Got the holeshot
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    wow, thats perfect, i was just gunna check my jetting, thanks!
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  3. Quickonstep
    Quickonstep is offline Registered User At the back of the pack
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    maybe this should be sticky, and i cant remember where i got the pictures, someplace on the net a few years ago. Or even put on the main page.

    Jesse
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  4. Yamahauler's Avatar
    Yamahauler
    Yamahauler is offline Power User Got the holeshot
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    i think they should put it on the main page. Good info.
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  5. Billy Golightly's Avatar
    Billy Golightly
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    Yes thats definetly main page worthy. I'll put that on there next update. Should help out alot of other people.
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  6. Quickonstep
    Quickonstep is offline Registered User At the back of the pack
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    honda if youd like me to i can make a doc or a html with it setup nice and neat.. if youd like...

    Jesse
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  7. Billy Golightly's Avatar
    Billy Golightly
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    Its not really necessary, but if you'd like to that would be fine. Just email it to me
    Last edited by Billy Golightly; 07-18-2008 at 12:25 PM.
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  8. Quickonstep
    Quickonstep is offline Registered User At the back of the pack
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    ok.. i can leave it like that.. seems pretty understandable... hope it helps a few people. i posted it because i have seen a few people posting about rejetting and what not.

    Jesse
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  9. googel35
    googel35 is offline Registered User Arm chair racer
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    Them pictures really help alot because I know a lot of people have that problem and the spark plug is a good way to check it.
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    twgranger
    twgranger is offline Registered User 4 Wheels? Huh?
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    Did this ever make it to being a sticky??
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  11. kando
    kando is offline Registered User First time rider
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    yes its in the tech section.
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  12. HRC1
    HRC1 is offline Registered User Arm chair racer
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    this may help also. http://www.strappe.com/plugs.html
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