Generator emits black smoke from the exhaust and runs rough, especially under load.

Safety first: Ensure adequate ventilation. Shut down the generator if smoke is excessive.

• Check air filter: Replace a dirty or restricted air filter element.
• Inspect choke operation: Verify that the choke plate opens fully after warm-up. Repair or replace the choke linkage or automatic choke actuator if it remains partially closed.
• Carburetor adjustment: On adjustable carburetors, set the mixture screws to the factory baseline and fine-tune for smooth running.
• Regulator check: For gaseous fuel models, have a gas technician verify that the All Power America-specified regulator is set to the correct outlet pressure.