Generac — Spark Plug Service
Maintenance · Spark plugs
From a Generac owner's manual — check it applies to your exact model before use.
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Procedure
- With the generator OFF and the engine cool, lift the lid and remove the front panel.
- Clean the area around the base of the spark plugs to keep dirt and debris out.
- Remove the spark plugs and check their condition.
- Install new plugs if the old plugs are worn or questionable.
- Clean the plugs by scraping or washing with a wire brush and commercial solvent.
- Do not blast the plugs to clean.
- Check the spark plug gap using a wire feeler gauge.
- Replace the spark plug if the gap is out of specification.
- Reinstall the spark plugs and torque to 18.4 ft-lbs (25 Nm).
- Press the control panel AUTO button to return to AUTO mode.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Spark plug gap: 0.040 in (1.02 mm)
- Torque: 18.4 ft-lbs (25 Nm)
Source: Generac owner's manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.