What's everyone's vote on which Spark Plugs to use?
Again, I bought a used 2006 Heritage Deluxe with 11,000 miles, so I am going to change them - currently has the HD SR12 installed.
There's a spark plug poll here on the forum but for some reason I can't find it. The most widely used plug is the stock Harley plug that came in your scoot.
Spark plug questions are right up there with oil questions. Groan... not another one! LOL! Just kidding. Stock plugs work just fine. There's the great debate over knock sensors on EFI bikes though. The engineers at the factory designed the sensors to work with stock plugs. Some say even a little bit of metallic "thread lube" will trigger them to retard timing. Non EFI bikes however, it's owners choice and a lot prefer NGK.