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Rubber Mount Sportster Motorcycle Talk (2004-2006) This area is to discuss issues, problems and anything else unique to the 2004 and above Sportster motorcycles

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  #21  
Old 3 Weeks Ago
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When installing any part for any of my vehicles, I never assume anything to be correct. I've found oil filters with loose or missing o-rings and I've found spark plugs (NGK and other brands) to be "off-gap", maybe from production or maybe from damage in packaging or in transit. Most of the time NGK gap is perfect but not always.
This goes back to the carpenter's rule: "Measure twice, cut once."
Seriously, how difficult or time consuming is it to check the gap on a spark plug?
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  #22  
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Sure, the gap may still need to be adjusted for your vehicle but according to NGK's own website the gap IS set at their factory which contradicts CVOs webpage that you linked to.
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I've never understood why people think spark plugs come "pre-gapped". The manufacturers usually set a "production run" at a certain gap even tho the spark plug is designed for more than one engine. Then they can dropped in shipping/stocking. (that's a good tell tale sign they may have internal damage. All the plugs, I remember installing, where the gap was required to be .040-.060 usually came packaged at .035 gap.

Always check and set the gap before installing.
Once you set the gap, on a Copper, Platinum or Iridium Spark Plug, you aren't supposed to reset as it causes damage to the tip (after being fired).
These aren't your mother's carbon tipped plugs anymore.
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Quote:
Originally Posted by Toejam503 View Post
I've never understood why people think spark plugs come "pre-gapped". The manufacturers usually set a "production run" at a certain gap even tho the spark plug is designed for more than one engine. Then they can dropped in shipping/stocking. (that's a good tell tale sign they may have internal damage. All the plugs, I remember installing, where the gap was required to be .040-.060 usually came packaged at .035 gap.

Always check and set the gap before installing.
Once you set the gap, on a Copper, Platinum or Iridium Spark Plug, you aren't supposed to reset as it causes damage to the tip (after being fired).
These aren't your mother's carbon tipped plugs anymore.
Well said!
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Toejam, I don't think anyone is disagreeing. I just wanted to avoid confusion by highlighting that the statement linked in post 19 about NGK plugs
not being factory gapped anymore is not true according the NGK website. The rest we agree with. Adjust away.
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By people, I didn't necessarily mean anyone on this forum. Working in the automotive field, most of my life, I've seen so many guys remove the spark plugs from the boxes and install them without ever gapping them. When anyone would question them, their replies were "They're already pre-gapped". Where this assumption ever came from is beyond me. Even the quote from NGK is misleading because it doesn't refer to a specific vehicle's gap, just a "gap from the NGK Factory".

Last edited by Toejam503; 3 Weeks Ago at 21:58..
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