Generac — Maintaining the Spark Plugs
Maintenance · Ignition
From a Generac owner's manual — check it applies to your exact model before use.
Applies to: Generac 15 kW EcoGen, Generac G-Force 1000 Series engine
Before you start
- Do not disconnect spark plug wires with engine running
Parts for this job
- RC12YC Spark plug Amazon eBay $12.90 NAPA $11.52 FridayParts $19.99
Part numbers from the service-parts list for Generac 15 kW EcoGen. Verify against your serial number before ordering; some links are affiliate links.
Procedure
- Lift lid and remove front panel with generator shut down
- Remove screw to release AVR filter housing
- Clean area around spark plug base
- Remove spark plug cables from terminals
- Remove spark plugs and check condition
- Clean by scraping or washing with wire brush and solvent
- Check gap with feeler gauge, replace if out of spec
- Install spark plugs and torque to 18.4 ft-lbs (25 Nm)
- Attach spark plug cables
- Install AVR filter housing
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
- Spark plug torque 18.4 ft-lbs (25 Nm)
Full service-parts list: Generac 15 kW EcoGen →
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.