Do these plugs look like the mix is rich? - Harley Davidson Forums: Harley Davidson Motorcycle Forum
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post #1 of 11 (permalink) Old 08-04-2011, 06:51 PM Thread Starter
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Do these plugs look like the mix is rich?

Hey all its been a long long time since I looked at plugs to diagnose problems. Thought I might have an intake leak after I installed the SE Heavy Breather so I pulled the plugs. It definitely doesn't look lean, but I can't decide if its rich, just right or perhaps burning off a bit of oil. If I had to guess it looks a bit too rich.

Thoughts?
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post #2 of 11 (permalink) Old 08-04-2011, 06:54 PM
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they look pretty good to me
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post #3 of 11 (permalink) Old 08-04-2011, 06:58 PM Thread Starter
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Thanks, I'll stick em back in and find something else to obsess about.

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post #4 of 11 (permalink) Old 08-04-2011, 07:07 PM
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they look pretty good to me
+1 looks fine from here too.
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post #5 of 11 (permalink) Old 08-04-2011, 07:51 PM
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plug chart

chart I found

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post #6 of 11 (permalink) Old 08-04-2011, 08:10 PM
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But the question still is the old method of reading plugs was really for carb's.
With EFI its not the same... is it?
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post #7 of 11 (permalink) Old 08-04-2011, 10:22 PM
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pretty much the same

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post #8 of 11 (permalink) Old 08-06-2011, 01:11 PM
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now i was told that the efi motor plugs tend to burn more on the whiteish grey side as far as the norm goes ,and the carbed motors plugs burn a tannish grey for a properly tuned motor .when i first got my 09 sportster and pulled the plugs on it i saw that the plugs were whiteish grey and i freaked because to me they looked way too lean but was reassured by a friend that runs a h-d performance race shop that was the normal color for a properly tuned motor.

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post #9 of 11 (permalink) Old 08-06-2011, 02:29 PM
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Looks to have a lil pre-ignition on the first plug. Did that one come out of the rear hole? Quite a bit of allumium on the plug.

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post #10 of 11 (permalink) Old 08-06-2011, 04:24 PM
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Quote:
Originally Posted by Uncle Fester View Post
But the question still is the old method of reading plugs was really for carb's.
With EFI its not the same... is it?
EFI vs carb: It's the same. You're looking at an end result, not the fuel delivery.

The plugs look fine, but as stated, possibly some preignition.

EFI plugs are generally lighter then carbed plugs because EFI is more efficient, uses less fuel during warm ups, which in turn, leaves less residue and less carbon, due to less fuel used, but more importantly, a more consitant delivery.

EFI isn't effected by gravity, bike lean angle, ambient temps (as much), or things like worn needles, loose jets, float settings, choke issues, enrichener issues or bowl vents.

Of course, that because EFI is programmed to run at specific, consistent a/f ratios, and not all over the scale, like a carbed motor does. EFI is also set to run at 14.7:1 by most if not all MFGers, so a whiter plugs will be seen on stock bikes, or ones with a stock ECU program.

Better, richer settings are applied to EFI, to obtain more power, cooler running temps, richer mixtures, resulting in darker colored ceramic on plugs.

The MFGer could care less what the plug looks like. They go by EPA rules.

Most Asian bikes used to run a 16 or 32 bit ECU, which was slightly richer then most US bikes. It was nice, because mods effected them less. They were also water cooled bikes, so heat was controlled better, unlike our air cooled bikes.......

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