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Harley doesnt make plugs it just buys from vendors that brand them "harley", the trip plats are made by bosch not sure who makes there others for them.
I ran the HD regulars that came in the bike to 6500 miles. I got a sudden miss. I replaed them with the same and got a miss about 6500 miles later. I replaced those with HD platinums. I ran those plugs for over 30k. The bike was running fine on them when I replaced them last summer after doing some engine upgrades and wanted to monitor the burn on a new set of plugs.
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RE: regular or fancy plugs
