Generac 6485 Scheduled Maintenance Kit — 20kW–26kW 999cc V‑Twin (2013+) OEM Filters, Plugs & Tools

The Generac 6485 Scheduled Maintenance Kit supplies all factory-recommended consumables for a full service of air-cooled 999cc V‑Twin standby generators built 2013 and later.

This comprehensive OEM service pack gathers the replacement parts and basic tools you need to perform a scheduled maintenance on compatible Generac, Honeywell by Generac, and Centurion by Generac standby units. It’s intended for the 20kW, 22kW, 24kW and 26kW models with the 999cc V‑Twin engine (2013+). Engine oil is not included, so pick up SAE 5W‑30 full synthetic oil before you begin. The kit’s components, instructions, and reminder sticker make routine service straightforward while preserving factory tolerances and warranty eligibility.

Which generator models and years are compatible with this kit?

This kit is made specifically for air‑cooled standby generators that use the 999cc V‑Twin engine manufactured in 2013 or later. It supports units sold under the Generac, Honeywell by Generac, and Centurion by Generac names. Older generators with different engine specs need the earlier kit version.

• Fits 20kW, 22kW, 24kW, and 26kW air‑cooled models with 999cc V‑Twin engine
• Compatible with Generac, Honeywell by Generac, Centurion by Generac branded units
• Applies only to engines manufactured in 2013 or newer
• Check the model and serial plate or owner’s manual to confirm fit

What parts and tools are included in the 6485 kit?

The kit includes every consumable part you’ll need for a standard scheduled service except engine oil. All replacement components are original Generac parts, plus a few service aids that simplify the task and help keep your enclosure clean.

• OEM flat‑panel air filter and foam pre‑cleaner for reliable airflow protection
• Spin‑on oil filter and two pre‑gapped OEM spark plugs
• Angled oil funnel, microfiber cleanup cloth, maintenance reminder sticker
• Step‑by‑step instruction manual; no specialized tools required beyond standard hand tools

How often should I perform this scheduled maintenance?

Follow Generac’s interval guidance to keep the engine running cleanly and to maintain warranty compliance: perform a full maintenance at either 200 hours of run time or every two years, whichever occurs first. Environments with heavy dust or debris may require more frequent attention.

• Standard interval: every 200 hours of runtime or every 2 years
• Increase frequency in dusty, coastal, or debris‑heavy locations
• Use OEM parts to preserve manufacturer warranty eligibility
• Reset the maintenance reminder on the controller after service (instructions included)

Who is this kit intended for? Homeowners, facility managers, and service technicians who maintain air‑cooled Generac standby generators with the 999cc V‑Twin engine will find this kit convenient and complete. It’s suitable for DIYers comfortable with basic mechanical tasks and for professional techs who prefer genuine OEM replacement parts to meet factory tolerances. If your generator was built before 2013 or uses a different engine, choose the matching service kit for that model year.