Plug Gap
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Tourer
Joined: Feb 2011
Posts: 375
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Plug Gap
So, I'm doing the 20k service on my FB and on the screaming eagle plug box it says they are pre gapped at .35? I thought .40 was were they needed to be at? Should I change or leave at the .35?
Road Master
Joined: Nov 2010
Posts: 1,115
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From: Bay Area, NorCal
For what it's worth, I was "taught" that today's hi-energy ignition/coil systems allowed for a slightly wider plug gap, which yields a slightly longer spark, which results in more complete burning of the air/fuel mixture in the chamber. So for years I gapped my plugs at .040"-.044" on my old FXR and never had any probs, and do the same now on my FB. Others may differ, and of course, your results may vary!
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Advanced
Joined: Oct 2011
Posts: 66
Likes: 1
From: Syracuse, NY
So, how did it do? I was wondering the same thing, and gapped the plugs at .40 and feel like I may have lost some power. This, of course, could be my imagination or be caused by something else. So I'm curious how it turned out for you.
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jacknthebox
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Apr 2, 2012 08:43 PM
