ER2500CX
Engine lacks power:
Possible Cause: Bad fuel; generator stored without draining gasoline, or refueled with bad gasoline.

Drain fuel tank and carburetor. Refuel with fresh gasoline
Correction
Possible Cause: Bad fuel; generator stored without draining gasoline, or refueled with bad gasoline.
Drain fuel tank and carburetor. Refuel with fresh gasoline