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[JKM]

Just swapped out my plugs today.  Probably about 10K miles on them.  Back cylinder a little darker, but wanted to get peoples thoughts.  I attached two pictures are both plugs seem to be lighter on one side of them.  Gap in old plugs were still about 0.040.

[JKM]

and now dark side

[Yellow09SERG]

Did you happen to mark how they were indexed in the head? First guess would be light side faces pistons more so than the dark side

[2smoke]

You didn't mention how many total miles are on the engine. For 10,000 miles I don't think they're too bad. That juiciness on the rear plug could be a little blow-by in that cylinder or signs of a worn valve guide and/or seal. Do you notice oil consumption when checking your oil? if it were me I'd throw a new set of plugs at it and run it.

[JKM]

total mileage only about 12-13K miles on the engine.  It's a 2008.  The heads were done in 2013 and tuned with PC-V and not about 10K miles later.  Runs good, just curious what others thought.  The front plug seems fine, the rear has a little more carbon.

I did not index the plugs on removal.  I should have, but never thought about it at the time.

[ultra13]

Front looks normal. Something going on in the rear. Look up Kevin Baxster's video (you tube) on plug reading. Hard to believe you can read so much just from a plug. He has his own shop in Georgia called Pro Twin performance or Baxster's garage.

[windjammer]

Put some miles on that baby!

[Rimjam]

Reinstall them in the opposite cylinder & see what they look like in another 10K miles.

[JKM]

I put a new set of plugs in as those were in for 7-8yrs, although not that much mileage