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Author Topic: Thoughts On Condition of Plugs  (Read 1543 times)

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JKM

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Thoughts On Condition of Plugs
« on: August 16, 2021, 05:19:57 PM »

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.
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2008 FLHRSE4 (105 Anni)- V&H Dresser duals and slash cut mufflers, Big Sucker AI, PCV, Woods 777, JPrecision Heads

JKM

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Re: Thoughts On Condition of Plugs
« Reply #1 on: August 16, 2021, 05:20:29 PM »

and now dark side
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Yellow09SERG

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Re: Thoughts On Condition of Plugs
« Reply #2 on: August 16, 2021, 08:20:25 PM »

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
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2smoke

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Re: Thoughts On Condition of Plugs
« Reply #3 on: August 17, 2021, 10:30:30 AM »

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.
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JKM

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Re: Thoughts On Condition of Plugs
« Reply #4 on: August 17, 2021, 04:51:07 PM »

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.
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ultra13

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Re: Thoughts On Condition of Plugs
« Reply #5 on: August 17, 2021, 05:14:57 PM »

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.
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windjammer

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Re: Thoughts On Condition of Plugs
« Reply #6 on: August 24, 2021, 06:52:55 PM »

Put some miles on that baby!
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Rimjam

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Re: Thoughts On Condition of Plugs
« Reply #7 on: August 30, 2021, 10:01:53 AM »

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

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Re: Thoughts On Condition of Plugs
« Reply #8 on: August 31, 2021, 06:54:48 AM »

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