Do these plugs look ok?
Outstanding HDF Member
Joined: Sep 2005
Posts: 2,600
Likes: 7
From: Minnesota
I'd say they look ok as far a diagnosing how the engine is running; rich, lean, etc. but they should be changed at 10k. I change mine as part of my winter layup at less than 10k. They are cheap.
a. A wet, black and shiny deposit on plug base, electrodes and ceramic insulator tip indicates an oil fouled plug. The condition may be caused by one or more of the following: worn pistons, worn piston rings, worn valves, worn valve guides, worn valve seals, a weak battery or a faulty ignition system.
b. A dry, fluffy or sooty black deposit indicates an air-fuel mixture that is too rich.
c. A light brown, glassy deposit indicates an overheated plug. This condition may be accompanied by cracks in the insulator or by erosion of the electrodes and is caused by an air-fuel mixture that is too lean, a hot running engine, valves not seating or improper ignition timing. The glassy deposit on the spark plug is a conductor when hot and may cause high-speed misfiring. A plug with eroded electrodes, heavy deposits or a cracked insulator must be replaced.
d. A plug with a white, yellow, tan or rusty brown powdery deposit indicates balanced combustion. Clean off spark plug deposits at regular intervals.
a. A wet, black and shiny deposit on plug base, electrodes and ceramic insulator tip indicates an oil fouled plug. The condition may be caused by one or more of the following: worn pistons, worn piston rings, worn valves, worn valve guides, worn valve seals, a weak battery or a faulty ignition system.
b. A dry, fluffy or sooty black deposit indicates an air-fuel mixture that is too rich.
c. A light brown, glassy deposit indicates an overheated plug. This condition may be accompanied by cracks in the insulator or by erosion of the electrodes and is caused by an air-fuel mixture that is too lean, a hot running engine, valves not seating or improper ignition timing. The glassy deposit on the spark plug is a conductor when hot and may cause high-speed misfiring. A plug with eroded electrodes, heavy deposits or a cracked insulator must be replaced.
d. A plug with a white, yellow, tan or rusty brown powdery deposit indicates balanced combustion. Clean off spark plug deposits at regular intervals.
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Cruiser
Joined: Apr 2007
Posts: 192
Likes: 3
From: Kansas
I forgot to mention that these photos were taken after running 3,000 miles (installed at 15000 miles on odometer) with a high flow air cleaner and free flowing slip on mufflers installed. No modified fuel management.
Account Retired
Joined: Oct 2009
Posts: 3,245
Likes: 12
From: Here
Thanks for posting. This proves the stock ECM is doing what it's capable of doing. Plugs look Good!!! If it's running good don't fix it until it's not...LoL
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