Generac — Spark Plug(s)
Maintenance
From a Generac owner's manual — check it applies to your exact model before use.
Applies to: Generac GH-410 engine, Generac GT-530 engine, Generac GT-990 engine, Generac GT-999 engine
Before you start
- Do not blast the 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 is questionable; clean with wire brush and solvent.
- Check gap with a wire feeler gauge.
- Adjust gap by carefully bending the ground electrode.
- Install spark plug(s).
Tools required
- Wire feeler gauge Amazon
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 and 20kW
- Gap 1.02 mm (0.040 inch) for 13, 14, 16 and 17kW
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.