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Carbon build up on stock plugs

5K views 6 replies 6 participants last post by  Touring_tech 
#1 ·
I had my stock plugs replaced with a set of NGK (1422) ILKR8E6 and noticed the originals looked pretty dirty with carbon buildup. There is only 9K on them, perhaps this is normal or the stock ones were crap. Also, I used a few brands of octane booster which could be the culprit. Any thought anyone has, please share.
 

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