Inspect every 100 hours; replace annually or every 200 hours. The recommended gap is 0.9–1.0 mm (0.035–0.039 in). Spark Arrester: Clean carbon deposits every 100 hours using a stiff brush. 4. Basic Troubleshooting Honda EX Series Generator Owner's Manuals
—the engine section is identical, but the generator head information is unique to the EX500 manual. honda ex500 generator manual
If you prefer a laminated, water-resistant copy to keep inside the generator’s storage compartment, aftermarket reprint shops sell spiral-bound versions. Ensure the listing explicitly states "EX500" and not "EX5000" (a completely different industrial unit). Inspect every 100 hours; replace annually or every 200 hours