Harley-Davidson Sportster Evolution Spark Plugs Replacement
Removing and installing the front and rear spark plugs.
- Author: Eric Essen
- Time estimate: 30 minutes
- Difficulty: Moderate
This guide will show how to remove the old spark plugs, check the new spark plugs for installation, prepare the spark plugs for installation, and reinstall the new spark plugs.
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Carefully remove the spark plug wire. Do not pull on just the wire, squeeze the spark plug boot, and pull it together with the wire.
Use an 11/16" spark plug socket to unscrew the spark plug by turning in a counter-clockwise direction.
Remove the spark plug from the cylinder.
Always inspect your new spark plugs before installing. Check the gap on your replacement spark plugs with a feeler gauge. It should be set to .040 inches.
Using your fingers, install the new spark plug into the socket, and hand tighten until firm.
Using a torque wrench, tighten the spark plug to the proper specification.