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EVO spark plugs w/ removable top nut

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Old Feb 6, 2026 | 04:47 PM
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Originally Posted by Heresolong
Champion made Harley plugs for years, you could tell by the markings on the metal part of the plug.
Yes they did but they made them to Harley specs not to Champion specs and they were not as good.
 
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Old Feb 13, 2026 | 07:46 AM
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Problem solved.

Anything is possible when you have a friend who owns a tool shop. The thread is M5.
 
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Old Feb 13, 2026 | 12:55 PM
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You were looking for the brass nut? I found mine at an old hardware store in the "lamp parts" bin, like $.10 each.
 
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Old Feb 14, 2026 | 12:09 AM
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Originally Posted by Hey Man
Yes they did but they made them to Harley specs not to Champion specs and they were not as good.
Had a '68 bored and stroked BSA back in the old days.It was scary fast as light as it was.
I tried champion plugs and they would stop working in a couple days. Electrodes looked good , but would not fire. Went to NGK, and never had another problem.
IDK if there is an NGK for my '98 Ultra.
 
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Old Feb 14, 2026 | 08:51 AM
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Originally Posted by evotrike
Had a '68 bored and stroked BSA back in the old days.It was scary fast as light as it was.
I tried champion plugs and they would stop working in a couple days. Electrodes looked good , but would not fire. Went to NGK, and never had another problem.
IDK if there is an NGK for my '98 Ultra.
Never heard Anything like that...But.....
My Bitter Half has a Bonnieville that works a damn on Autolites....Number????? Would Need to take a Walk...
 
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Old Feb 15, 2026 | 12:32 PM
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Originally Posted by Architect
You were looking for the brass nut? I found mine at an old hardware store in the "lamp parts" bin, like $.10 each.
Not only the brass nut, I also had to thread the top of the spark plug, as the Champion RN12YC does not have e removable top nut.
 
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Old Feb 16, 2026 | 06:54 AM
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May I ask what the issue is with the removeable top cap?
 
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Old Feb 16, 2026 | 09:13 AM
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Originally Posted by 97SpringerResto
May I ask what the issue is with the removeable top cap?
Nope... You gotta Read The Thread!!!
 
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Old Feb 16, 2026 | 09:51 AM
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I hope you find what your looking for.....
 
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