Best spark plugs?
Ultimate HDF Member
Joined: Aug 2008
Posts: 5,413
Likes: 17
From: eastern oklahoma
i've been using the R12-G for years without any problems at all. i've used them in my last three harleys and using them in my newest, an 08 streetglide. when i find something that works, i stick with it. i'm not for all the gimmicks, like splitfire, iridium, platinum, copper core, etc. i have been using the R12-G just because they seem to work quite well without all the goofy two, three, or four legged stuff going on.
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Joined: Feb 2010
Posts: 62
Likes: 0
What is in my bike are champion RA8HC,my motor is a stroker with big bore kit and a bunch of head work.The plugs that are in it right now work fine but i was woundering if there was better maybe NGK's?
Seasoned HDF Member
Joined: Oct 2006
Posts: 5,977
Likes: 85
From: Nevada
The NGK would be DCPR8E which I think is an excellent plug.
Champion RA6HC
Autolite 4163
All are good imho.
Outstanding HDF Member
Joined: Feb 2009
Posts: 2,005
Likes: 53
From: ID Ho
Seen every brand of plug cause problems including Champion that was sovled by replacing them with stock plugs.
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Outstanding HDF Member
Joined: Apr 2007
Posts: 2,216
Likes: 2
From: Mill City Mass.
Since I have OCD I replace my plugs with stock HD ones every oil change. The ones I take out every oil change are perfectly fine but I still do it just cause it cost a few bucks every month and a half.
Harley has millions of dollars in R&D behind their bikes and if they say the stock ones are good then I trust em.
Harley has millions of dollars in R&D behind their bikes and if they say the stock ones are good then I trust em.
Extreme HDF Member
Joined: Sep 2005
Posts: 11,615
Likes: 50
From: Baton Rouge, LA
I've had excellent luck with Autolite 4163, which is one heat-range colder than stock. There is no problem with the knock-sensing function with these plugs. IIRC they only cost $1.75 each and are very durable. A tech friend also uses these in his '00 EGC.
Last edited by iclick; Apr 9, 2010 at 08:19 PM.