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Old 06-15-2007, 02:15 PM   #1
Scooby Specialist
Member#: 80012
Join Date: Jan 2005
Chapter/Region: RMIC
Location: Salt Lake City, UTAH
04 BMW M3
Ducati 620 Dark / 08' 848

Default Spark plug gapping procedure help

I am going to swap out my spark plugs after work today and I have a few questions. I am going to be going with NGK copper's and they usually come with a gap of .030+ and I want to be at a .028 gap. What do you guys do to shorten the gap? I've been told by some to tap the "prong" down on a hard surface to close the gap but have also been told that this is bad. What is the correct procedue?

Now after closing the gap is there a special way or tool to use to widen the gap to .028? I've been told that the wire gauge is the best to use to check the gap because the coin piece leaves a slight angle. Is this correct? Thanks for your help.
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Old 06-17-2007, 11:48 AM   #2
Scooby Guru
Member#: 1134
Join Date: Mar 2000
Chapter/Region: MAIC
Location: Dillsburg, PA
2015 Outback H-6


Pep Boys and other places sell plug gapping tools, they look like this:

Now I'm sure these are cheap and I'm not sure about reliability. But who knows. You slide the end of the plug over the edge, and slide it up to the measurement you're looking for. It will widen the gap as you slide it across.
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Old 06-17-2007, 04:37 PM   #3
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Member#: 127429
Join Date: Sep 2006
Chapter/Region: MWSOC
Location: Fargo, ND
2006 Legacy GT Limit


well i use a wire guage, one but i dont know if its the best because its so touchy, i adjust and double check like 50 times before its perfect. on the wire guage there should be a gapper prong well use that in the opposite way to make the gap smaller, try not to bang it on something hard. a lot of ppl do it, and i have heard stories of the electrode breaking off.
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