Simple Spark Plug Question
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Novice
Joined: Jul 2012
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From: N. Las Vegas, NV
Simple Spark Plug Question
I searched but did not find an answer to the following. Is there any reason with an 07 Ultra Classic that is stock that I need to get the Harley store plug vs. the Champion variety ??
Outstanding HDF Member
Joined: Jan 2011
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From: Western Illinois, land of bad roads, and corrupt politicians
Simple answer: 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.
Source: https://www.hdforums.com/forum/fuel-...ml#post9359708
Your call
The use of any other spark plug other than 'Stock' (6R12) disables the anti-knock feature.
Source: https://www.hdforums.com/forum/fuel-...ml#post9359708
Your call
Last edited by shooter5074; Apr 13, 2015 at 09:49 AM.
Outstanding HDF Member
Joined: Sep 2010
Posts: 2,630
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From: Mountain West, Big Sky Country
I run autolites in my 04 and the harley vrod plug in my 12 with a 120R
The 120r likes harley plugs better than others where the 04 it does not seem to affect performance
So i cough up the extra coin for HD plugs on the later model bike
The 120r likes harley plugs better than others where the 04 it does not seem to affect performance
So i cough up the extra coin for HD plugs on the later model bike
Ultimate HDF Member
Joined: Jan 2008
Posts: 6,532
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From: SoCal
I have had my bike with autolite 4164's and the champs installed at different times on the dyno and both kept the ion sensing feature working properly. Unless you have a way to check, it might be smart to use the stock plugs, if you are concerned.
Outstanding HDF Member
Joined: Sep 2010
Posts: 2,630
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From: Mountain West, Big Sky Country
Autolites are about a $1.29 each.
For newer bikes its not a lot of coin To buy HD plugs.
My older bike performs better on non hd plugs. I assume thats because most of the internal parts in the engine are non HD.
For newer bikes its not a lot of coin To buy HD plugs.
My older bike performs better on non hd plugs. I assume thats because most of the internal parts in the engine are non HD.
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Ultimate HDF Member
Joined: Jan 2009
Posts: 5,016
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From: East Tn Foot of The Dragon
I'll make this simple: Use the stock Harley plugs. Did I say use the stock Harley plugs? Yes, use the stock Harley plugs.
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Road Captain
Joined: Jan 2014
Posts: 566
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From: The Redneck Riviera
'Just bought Champion RA8HCs for my bikes today...
Saving $3 per plug X 6 plugs, is a case of Coors Light...
No issues with ion.
Harley doesn't make plugs.
Saving $3 per plug X 6 plugs, is a case of Coors Light...
No issues with ion.
Harley doesn't make plugs.
Last edited by FlaHeatWave; Apr 14, 2015 at 07:10 PM. Reason: adding text