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A friend needs some help

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Old Jun 29, 2019 | 06:15 PM
  #1  
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Default A friend needs some help

He has a 2000 ultra classic and for some reason he can't figure out it's fouling the plugs after just one ride, I was behind him today and at about 75 it started to act up. Here is the brand new set he put in today,
 
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Old Jun 29, 2019 | 06:45 PM
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One on the left looks fine and the one on the right a tiny bit lean but still good.
They are not fouled so he is going to have to look elsewhere for the problem.
That is a fouled plug below.
 
Attached Thumbnails A friend needs some help-spark_plug_carbon_fouled_1.jpg   A friend needs some help-spark-plug-lean-rich-optimal-640x360.jpg  

Last edited by scotty3; Jun 29, 2019 at 06:52 PM.
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Old Jun 29, 2019 | 07:00 PM
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Plugs aren't fouled from what I see, I'd be looking at other issues like weak spark or choked fuel flow and why that's happening.
 
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Old Jun 29, 2019 | 07:17 PM
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For me the one on the left looks good and the one of the right a little rich. I'd leave off the finned plug covers and make sure the inside of the plug caps are clean. Also if running plugs with screw on caps, make sure they are tight. Hard to tell from the pick if it EFI or carb. Looks like EFI.
 
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Old Jun 29, 2019 | 07:25 PM
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He is starting to think it could be a bad valve
 
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Old Jun 29, 2019 | 08:41 PM
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Has he done a hot/cold compression test ? Leak down test will tell you if it's valve related also.
 
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Old Jun 29, 2019 | 08:57 PM
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Originally Posted by TwiZted Biker
Has he done a hot/cold compression test ? Leak down test will tell you if it's valve related also.
He hasn't yet but that's what he is leaning towards doing shortly
 
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Old Jun 30, 2019 | 03:07 AM
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Originally Posted by scotty3
One on the left looks fine and the one on the right a tiny bit lean but still good..
I meant a tiny bit rich not lean............Sunday mornings and no coffee
 
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