What is a common sign that a chainsaw chain needs sharpening?

A common sign that a chainsaw chain needs sharpening is that the cuts are less efficient and require more pressure. When the chain is sharp, it can slice through wood easily, requiring minimal effort from the operator. However, as the chain dulls, it struggles to make clean cuts, often needing the operator to apply additional force to achieve the desired depth of cut. This increased effort is a clear indication that the chain has lost its cutting effectiveness and is in need of sharpening to restore proper cutting efficiency.

The other options do not accurately represent the signs of a dull chain. A smoothly moving chain indicates proper function, while excessive smoke often suggests issues with the engine or a fuel-related problem rather than the sharpness of the chain. Likewise, less vibration typically signifies a well-maintained chainsaw; a dull chain more often leads to increased vibration instead. These factors further clarify the importance of recognizing performance characteristics directly related to the sharpness of the chain.