4R vs 3-4 plugs??
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Novice
Joined: Jul 2014
Posts: 24
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From: Bay Area ca
4R vs 3-4 plugs??
Are the 4R an acceptable replacement? Motors a 1974 big inch in a fx. I have no need for a resistor plug, but that's what local Harley had. I feel like the bike isn't running as well, but I'm chasing other demons out also. What's everyone's opinion, and experience?
Seasoned HDF Member
Joined: Jul 2014
Posts: 8,619
Likes: 3,387
From: Cental, MI
And???? For Points??? Fine either way, but non resistor preferred..
If Electronic Ignition??? Which one?
The Heat range on the other hand, can only be determined by Running the engine, with a Proper tune...
If Electronic Ignition??? Which one?
The Heat range on the other hand, can only be determined by Running the engine, with a Proper tune...
Road Master
Joined: Apr 2012
Posts: 979
Likes: 38
From: new orleans,la
Xtreme Sport Iridium Spark Plug - XS-85 (short reach)
Xtreme Sport Iridium Spark Plug - XS-65 (long reach)
to each his own -- I use 4 XS-65 in my 97"
most spark plus you don't notice the difference-- I notice with the XS-65 --
Xtreme Sport Iridium Spark Plug - XS-65 (long reach)
to each his own -- I use 4 XS-65 in my 97"
most spark plus you don't notice the difference-- I notice with the XS-65 --
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Novice
Joined: Jul 2014
Posts: 24
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From: Bay Area ca
Points ignition. Gotta get her tuned proper though. But that's a whole other story, involving other threads....
Seasoned HDF Member
Joined: Jul 2014
Posts: 8,619
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From: Cental, MI
Yes there is a difference... if talking tenths or less... it is apparent...
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Novice
Joined: Jul 2014
Posts: 24
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From: Bay Area ca
And I will Not use Iridium.. nor any other "long life" type plug. I can afford to replace plugs with abandon... Don't need, nor desire, long life, nor metals that don't give up electrons readily...Give me Copper every time...
Yes there is a difference... if talking tenths or less... it is apparent...
Yes there is a difference... if talking tenths or less... it is apparent...
Club Member
Joined: Mar 2009
Posts: 66,137
Likes: 51,477
From: Niles Canyon Ca.
Point's huh? check the advance unit if the bikes running crappy, first thing I look at in them intakes leaks being the second, usually one or the other.
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