Generator runs roughly, surging up and down in RPM with fluctuating lights in the house.

Safety first: Turn OFF the generator and disconnect battery negative before mechanical adjustments.

• Inspect fuel system: Replace the fuel filter and ensure fuel lines are clear and not kinked.
• Clean carburetor/injectors: Use appropriate cleaner or have injectors professionally serviced.
• Check for vacuum leaks: Spray a small amount of carb cleaner around the intake manifold gasket while the engine is running; a change in RPM indicates a leak that needs gasket replacement.
• Adjust governor: Follow Firman service procedures to set governor linkage and spring tension for stable speed.

Persistent hunting after basic cleaning and checks should be addressed by a technician with proper test equipment.