Generac — Spark Plug Maintenance
Maintenance · Spark plug(s)
From a Generac owner's manual covering: GH-410, GT-530, GT-990, GT-999. Check it applies to your exact model before use.
Applies to: Generac GH-410, Generac GH-410 engine, Generac GT-530 engine, Generac GT-990 engine, Generac GT-999 engine
Before you start
- Do not blast spark plug(s) to clean.
Procedure
- Clean area around base of spark plug(s).
- Remove spark plug(s) and check condition.
- Replace if worn or reuse questionable.
- Clean by scraping or washing with wire brush and solvent.
- Check gap with wire feeler gauge.
- Adjust gap by bending ground electrode.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Gap 0.76 mm (0.030 inch) for 8,10,20kW; 1.02 mm (0.040 inch) for 12,14,16,17kW
Full service-parts list: Generac GH-410 →
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.