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Iridium Plug Gap

UncleRon

UncleRon

Member
I got some NGK Iridium spark plugs for the Heritage.
There was a warning not to gap these plugs as it would
break the tip. Had never heard of this and I'm uncomfortable
not checking the gap . Has anyone had experience with
this . The plugs were ordered specifically for the '04 Heritage
but how can you be sure of the 0.040 gap other than sticking
it in and seeing if/how long it works.
Thanks .
Unk
 
I have those in my wifes car.....runs fine. I'd just put them in and try it. I doubt you'll see a big difference from the H-D Plugs though.
 
Man, do I feel stupid :(
I assumed the iridium plugs would not
change the performance but thought
they would perhaps maintain the same
performance longer.
I'm not even sure I know what you mean
by "code" . Are you talking about having to
re map if I use these plugs ?!? I am reading
as much as I can but the learning process is
slower for these old brain cells. I'll continue
to give it my best shot somewhere .
Unk
 
Hey Unk, I think they are referring to setting a code for the bike, the diagnostic codes that make the engine light come on. I could be wrong, just a guess, I'm sure Glider or some one WAY more qualified can verify that for us. :57:
 
As a parts man, most the precious metal plugs such as platinums and iridiums say to gap them to factory specs. It just takes a special type gaper. It takes one of the gappers that comes with the round type feeler gauges.
 
Last edited:
Here's a picture of one it is a napa service tool part no. 164
 

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joyflyin said:
Hey Unk, I think they are referring to setting a code for the bike, the diagnostic codes that make the engine light come on. I could be wrong, just a guess, I'm sure Glider or some one WAY more qualified can verify that for us. :57:
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Joy hit it on the head here.:s

But stay with the stock plugs so the knock sensor (ION sensing) still works.
 
Stock plugs it is . I tried to research the plug question
and the only negative I found in the "archives here
was the cost. It's not the first time I've wasted $20.00
and , I'm sure it won't be the last :small3d015:
Unk
 
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