Is Anti-Knock Feature Disabled w/ Aftermarket Spark Plugs?

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02-07-2012, 09:22 AM

Jester750

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Is Anti-Knock Feature Disabled w/ Aftermarket Spark Plugs?

I was really interested in these plugs, till I did some internet research and found this:

Little known fact:
2005 and later Harley-Davidson EFI systems incorporate an "Anti-knock" feature that operates by reading the current resistance through the spark plugs.
The use of any other spark plug other than 'Stock' (6R12) disables the anti-knock feature.
(Yes, that means the Gold, Platinum and SE plugs will also disable this function)

Here is the website I got that info from:

http://www.harleyhelp.com/sparkplg.html

Here is the Thread that was started on it:
https://www.hdforums.com/forum/softa...ark-plugs.html

Is this true?
That any spark plug that is not stock (6R12) has a different resistance and will disable or give false readings to the anti-knock feature?

I figured you guys would definitely know the answer to this question since you are experts in this area.

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