Spark plug What is the proper spark plug setting for a 1999 harley davidson sportster xl 1200 custom?

Duplicate question already answered

With the engine cold, remove the wires from the spark plugs, then use a spark plug socket to remove them. Set the gap on the new plugs at 0.040 (forty thousandths). Give the threads a light coating of anti seize and install the new plugs. Re-install the wires and you are done.

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Gap your plugs to 38 thou. Check all your bulbs (one burned out will affect the rest) Take a look at all your fuses and make sure they are all ok. Otherwise you are probably looking at a wiring short which will require trouble shooting of the elctrical system. Buy your self a service manual for your bike, this will help you a lot.

Personally ....as a mechanic....I would recommend Amsoil 10w40....check it out?

http://www.amsoil.com/storefront/mcf.aspx

Spark plug gap is .038 to .043 of an inch (thousandths). Most everyone sets it at .040

I’m happy to assist further over the phone at https://www.6ya.com/expert/ryan_7b238a1b08d97b98

The proper air gap is .032 to .036 depending on spark plug brand.