Spark plugs carbon buildup

[Kyle c]

Hey guys, I’ve been noticing on the tops of my spark plugs where the boot goes over I’m getting a buildup of carbon or something black inside the boot and all over the tops of the plugs, even after cleaning both ends within 20 minutes it was starting to blacken again, anyone have any idea what it could be?

 

[JFGJetski]

Are you running rich on your carbs?

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[Kyle c]

Are you running rich on your carbs?

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More rich then lean but not to much

 

[Kyle c]

Are you using Solid Tip or Screw-On Tip NGK Spark Plugs?

I’ve been using the screw tips.

 

[CARBONX2]

Corona discharge
https://www.ngk-sparkplugs.jp/english/techinfo/qa/q17/index.html

 

[OCD Solutions]

I run solid tops and still get the black carbon buildup. Keeping everything nice and tight will minimize the buildup but I believe a certain amount will be inevitable.

Spark does not like to turn sharp corners. Ask anyone that has been struck by lightning or high voltage. It blows out elbows, knees and heels. You can't cheat physics.

 

[Freakrider]

Black soot it is referred to inside plug boots on terminal ends and will eventually with build up begin to become an insulator to interfere with conductivity.

 

[Freakrider]

Teamscream Racing Chucky additional tip: use an oring as shown to prevent spark arcing especially for msd TL systems. Note the low cost plug boot security with the zip tie.

 

[Kyle c]

Thanks for all the replies guys! I’ll deffinatly try the solid tip plugs next, I get a very good connection from my boot to the plug with a nice click each time, the build up starts within 20 minutes of riding which is why I was concerned,I was just worried maybe it was a sign of the coil starting to go