Spark plugs are key to engine efficiency. Learn how to replace them correctly to keep your GS running at its best.

Identifying When Spark Plugs Need Replacing

Fouling, misfires, or increased fuel consumption signal worn plugs.

Consult your manual for recommended replacement intervals.

Gathering Tools and New Plugs

You’ll need a spark plug socket, gap gauge, and your bike’s specified plugs.

Ensure plugs match heat range and thread size.

Removing and Inspecting Old Plugs

Remove plugs carefully after engine cool down and check for deposits.

Assess wear patterns to diagnose engine conditions.

Installing New Plugs

Set correct gap, thread lightly, and torque to specs.

Reattach ignition leads securely before testing engine startup.