Do these plugs look ok?
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Cruiser
Joined: Apr 2007
Posts: 192
Likes: 3
From: Kansas
Do these plugs look ok?
No luck posting this over on the engine related forum so I thought I would give it a try here. I would like to get some advise from somebody with more knowledge than me on the subject of reading plugs. Is my bike running lean, rich or ok? These photos were taken after 18000 miles. Plug on left is front cylinder. Bike is an 09 FLHT running better than ever. Thank You
Supporter
Joined: Aug 2008
Posts: 5,189
Likes: 16
From: N.E. Wisconsin
They look to me like.........................Very good ! The bottom electrode is not worn, the top electrode has white fluffy deposits ( very good sign of balanced combustion ) and the insulator is not shiny or cracked or deposits on it. Put new ones in anyway, unless your conducting an experiment. Your just show'in off !!!! ya banna....
Last edited by drukanfu; Jun 19, 2011 at 06:09 PM.
Road Warrior
Joined: Jun 2009
Posts: 1,943
Likes: 3
From: NYC
plugs look fine....the light ash is just reflecting your "Harley designed" lean mixture.
typically, the front plugs are darker than the rear ones due to the difference in actual cylinder operating temps, the rear is hotter.
typically, the front plugs are darker than the rear ones due to the difference in actual cylinder operating temps, the rear is hotter.
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Outstanding HDF Member
Joined: Sep 2006
Posts: 2,380
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From: Atlanta
Is it just the lighting, or does that last set look blistery hot from running too lean? The others look fine, so if the last set are the same plugs as the others, then it must be the lighting.
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Thread Starter
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Cruiser
Joined: Apr 2007
Posts: 192
Likes: 3
From: Kansas
Supporter
Joined: Mar 2011
Posts: 587
Likes: 1
From: Ga.
Your bike is running fine, those plugs are also a testament as to why they don't have to be changed every other month as some might suggest. In 18,000 miles the center electrode is barely worn, and for the plugs to look the way they do, you have no worries.