Engine working apparatus

An engine working apparatus, comprising:

• an internal combustion engine including a piston reciprocally movable in a cylinder and a combustion chamber defined by the piston;
• an ignition plug configured to ignite air-fuel mixture in the combustion chamber;
• a detector configured to detect a rotation number of the internal combustion engine;
• and
• a controller configured to
• in response to determining that the internal combustion engine is decelerating and the detected rotation number satisfies a predetermined deceleration condition, execute feedback control of determining an ignition timing of the ignition plug based on a deviation between a target rotation number and the detected rotation number, and
• in response to determining that the internal combustion engine has been accelerated after the internal combustion engine is determined as being decelerating, cancel the feedback control.