A Better Plug
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Fit
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Quality
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Installation
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Recommend
William Billings -
May 04, 2009(Key Largo, FL)
I purchased these plugs for my Harley after having such good experience with NGK in my sportbike. The factory plugs have done well, but seem to have had some problems with more recent reformulations of premium gasoline. So, I'm looking to the NGKs to provide the same clean, hot burn in my Twin Cam as they've done for my 600.
