Hunting and surging problems can occur at idle, top no-load speed, and under load.

Hunting and surging issues in an engine can manifest under various operational conditions, including idle, top no-load speed, and during loaded situations. When an engine is idling, it may not maintain a stable RPM due to fluctuating air-fuel mixtures, causing it to hunt for the optimal balance. Similarly, at top no-load speed, if the engine isn't properly tuned or if external factors affect fuel delivery, it can also demonstrate surging behavior as it struggles to maintain a consistent speed. Under load, the demands on the engine change, and it may experience a similar lack of stability, leading to these problems. Recognizing that these issues can occur at multiple stages of operation is crucial for effective troubleshooting and maintenance of four-stroke engines. Therefore, acknowledging the statement as true reflects a comprehensive understanding of engine performance dynamics across various conditions.