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spark plugs

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Post Fri Jul 24, 2009 7:57 am

Posts: 7
What are the best spark plugs to use in the U series motors

Post Fri Jul 24, 2009 8:54 am

Posts: 391
I have used Champion D14 and D16 (I think now DU14 &16) plugs in my Knuckles and Flatheads for the last 30 years. Only ever had 1 bad one during that time period. The D16 is the hotter one. Works well in my UL!

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