Spark Plug Observation.
Road Master
Joined: Oct 2011
Posts: 957
Likes: 2
From: Carlsbad Springs Ontario
Iridiums are the very best .
I am a little confused about your post though so i will offer this...
Do not run any plugs that you are not sure of ?
The depth of the plug and its heat range must be compatible with your motor.
If i understand correctly , you are wondering why you have carbon on the last few threads of the plugs ? If this is true i suspect your plugs are incorrect for your motor and you are probably very lucky that the pistons did not hit the plugs and cause you a world of hurt .?
Many sites available to ensure you crossover the correct plugs for your bike.
Advanced
Joined: Dec 2011
Posts: 60
Likes: 0
From: North Texas
You can measure the depth of the plug hole using a grip gauge. It's actually used for aircraft. If you can't find one PM me and I will get you one.
Here's a good one.
Here's a good one.
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Tourer
Joined: Mar 2013
Posts: 379
Likes: 0
From: Tampa Bay
'86 EVO, stock heads. I run NGK BPR5ES and Autolite 4265 with carbon on the first 1/4" or so on both types of plugs. Curious, I googled "harley evo sparkplugs" under images and nearly every used set had the same signature. I'm not saying there is anything wrong as these are the plugs spec'd just curious why and how it would run with standard thread plugs and if anyone else has tried it?
Club Member
Joined: Apr 2011
Posts: 5,799
Likes: 7,827
From: SE Louisiana
Here's some good info on reading plugs, will explain the color you see on the threads.
http://honda-tech.com/showthread.php?t=3063102
http://honda-tech.com/showthread.php?t=3063102
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Tourer
Joined: Mar 2013
Posts: 379
Likes: 0
From: Tampa Bay
Here's some good info on reading plugs, will explain the color you see on the threads.
http://honda-tech.com/showthread.php?t=3063102
http://honda-tech.com/showthread.php?t=3063102
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