Seller notes

You are buying one pair of Champion D-16 spark plugs with the air-cooled adapter kit. These are genuine D-16 18 mm plugs which works out to a #3 heat range for Harley-Davidson motorcycles. This kit is pretty neat, it utilizes newly-machined air cooled hex with original styled threaded retainer rings which the original air-cooled plugs were equipped with to help with cleaning. Essentially, you can use the included spanner wrench to disassemble the plugs for cleaning or to replace a broken or worn...

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