Harley-Davidson Sportster Evolution Spark Plugs Replacement
Removing and installing the front and rear spark plugs.
- Author: Eric Essen
- Time required: 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.
Embed this guide
With the HTML code below, you can embed this guide as a small widget on your website.
The spark plugs are easy to spot on the left side of the motorcycle.
The procedure for removing the spark plugs is the same for both the front and back cylinder, and either spark plug can be replaced first. This guide will show how to remove and install the spark plug in the rear cylinder.
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.
When installing spark plugs, proper torque can be important. To loose and they could rattle out or leak; too tight and you can strip your cylinder head. The correct torque for this plug is between 90 and 120 inch lbs.