Generac NP-66G — Setting Spark Plug Gap
Adjustments · Engine spark plugs
For the Generac NP-66G, from the Generac owner's manual.
Applies to: Generac NP-66G, Generac GN-480 engine
Before you start
- DO NOT BLAST CLEAN SPARK PLUGS
- Reform wire terminals if they do not fit firmly
Parts for this job
- 072347 Spark plug eBay $1.99
Part numbers from the service-parts list for Generac NP-66G. Verify against your serial number before ordering; some links are affiliate links.
Procedure
- Remove spark plugs.
- Clean by scraping or wire brushing and washing with commercial solvent.
- Reset gap to 0.030 inch (0.8 mm) using feeler gauge.
- Reinstall spark plugs.
Tools required
- Feeler gauge Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Spark plug gap 0.030 inch (0.8 mm)
- Every 100 hours of operation
Full service-parts list: Generac NP-66G →
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.