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4R vs 3-4 plugs??

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Old 10-08-2018, 09:17 PM
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Default 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?
 
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Old 10-08-2018, 09:25 PM
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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...
 
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Old 10-08-2018, 09:58 PM
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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 --
 
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Old 10-08-2018, 10:00 PM
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Points ignition. Gotta get her tuned proper though. But that's a whole other story, involving other threads....
Originally Posted by Racepres
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...
 
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Old 10-08-2018, 11:21 PM
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Originally Posted by biginchhustler
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 --
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...
 
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Old 10-08-2018, 11:35 PM
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Originally Posted by Racepres
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...
can I ask what you run? As in preferred brand, maybe part numbers?
 
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Old 10-08-2018, 11:42 PM
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Originally Posted by audiopro74
Points ignition. Gotta get her tuned proper though. But that's a whole other story, involving other threads....

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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