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[Stormer]

I have been experiencing ping during accelleration this summer, last summer not so much but a little.
drop a gear its gone, this is between 2500 and 3000 rpm. lots of people here in n wisconsin talkin about lousy fuel, and i have to say one tank to the next under similar conditions it does get better and worse so.
has anyone tried backing off on the plugs to a cooler one. if so what brand and #. im running the hd6r12 and have been told to got to autolite or some other brand first off. any recommendations. plugs look good for color, had the bike flashed and dynoed, afm looks good, mufflers are hd performance touring with stock head pipe.air cleaner etc also done with hd stuff so basically stock.
thanks.