different sparkplug color
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Cruiser
Joined: Jul 2007
Posts: 210
Likes: 15
From: Belgium, Brabant
different sparkplug color
Evening people,
Since I installed a new exhaust few months ago (V&H BSL) on my fatboy(1996), decided to have a look at the plugs.
Just to see if the carb needed more adjustment or something.
Who am I kiddin, It was raining **** out there and I just HAD to spend timearound the bike [>:].
Anyway, to my surprise, both plugs had a different colour!
Front plug was dark grey (way it should be?) The rear plug was light grey like cigarette ashes.
Is this normal?
Standard ignition, SE-plugs, standard carb, k&n AC.
Runs normal so i don't think it's a big deal. Does it have something to do with lesser cooling of rear cylinder?
Keep the chrome side up and rubber side down,
Someday, the sun wil shine again [>:][>:][:@]
Since I installed a new exhaust few months ago (V&H BSL) on my fatboy(1996), decided to have a look at the plugs.
Just to see if the carb needed more adjustment or something.
Who am I kiddin, It was raining **** out there and I just HAD to spend timearound the bike [>:].
Anyway, to my surprise, both plugs had a different colour!
Front plug was dark grey (way it should be?) The rear plug was light grey like cigarette ashes.
Is this normal?
Standard ignition, SE-plugs, standard carb, k&n AC.
Runs normal so i don't think it's a big deal. Does it have something to do with lesser cooling of rear cylinder?
Keep the chrome side up and rubber side down,
Someday, the sun wil shine again [>:][>:][:@]
HDF Community Team
Joined: Dec 2005
Posts: 5,402
Likes: 2,605
From: NC USA
RE: different sparkplug color
Typically the rear is a tick darker because the geometry of the flywheel on a dual fire makes the rear timing 3 degrees lower than the front.. just the way it is. And if the rear is lighter, usually indicates an abnormal lean condition caused by an intake leak, But from what you said, you're probably alright. Mine got light with that 2.00 dollar true dual conversion I did (still experimenting with that) but only the tip was lighter - the well of the plug is still normally dark(er).
Here are 2 links that are great about reading plugs:
http://www.dansmc.com/Spark_Plugs/Sp...s_catalog.html
http://www.cyclespot.com/Jetting.html
Here are 2 links that are great about reading plugs:
http://www.dansmc.com/Spark_Plugs/Sp...s_catalog.html
http://www.cyclespot.com/Jetting.html
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