Servicing the Spark Plugs
Generator owners should reference these articles before servicing the spark plugs:
Maintenance Schedule:
Maintenance Safety:
Maintenance Kits:
Generac sells maintenance kits that bundle Original Equipment Manufacturer (OEM) parts for maintenance tasks. See the What Are Generator Maintenance Kits? article for more information.
Authorized Service Dealers:
Environment
The process covered in this article applies to air-cooled Guardian (10-22 kW) series generators. Owners should always reference the user manual for maintenance tasks. See How Do I Find a Copy of My Home Standby Generator Owner's Manual and Spec Sheets? for more information.
Spark plug location
For all air-cooled V-twin 2-cylinder models, the spark plugs are located as shown below.
For all air-cooled single-cylinder models, the spark plug is located as shown below.
To inspect the spark plug gaps and replace spark plugs:
1. With the generator OFF and the engine cool, lift the lid and remove the front panel.
2. Clean the area around the base of the spark plug(s) to keep dirt and debris out of the engine.
3. Remove and inspect the spark plug: Use a 3/8-inch ratchet with a 5/8-inch spark plug socket to remove the spark plug. Check the condition of the plug and replace it if it shows signs of wear or if its reuse is questionable.
4. Clean plug(s) by scraping or washing with a wire brush and commercial solvent. Do not blast plug(s) to clean.
Note: Clean spark plug in emergency situations only. Otherwise, replace the spark plug.
5. Inspect the spark plug gap using a wire feeler gauge. Replace the spark plug if the gap is out of specification.
Engine information is found in the Specifications section of the generator's user manual.
Note: New spark plugs should have spark plug gaps checked prior to installation.
6. Install the spark plug(s), and tighten to 18.4 ft-lbs (25Nm).
7. Press the AUTO button to return the unit to AUTO mode.
