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i had my plugs out at 500 miles i would consider it on the lean side the insulators are mostly white with some beige on one side, the top of the thread area around the insulator is black n dry but my driving has been in cooler temps 40-70 (dense air) i do have lots of hesitation till the bike warms up has anyone used the colder plugs #7 for highway driving??

my bike is stock
 
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