Which issue may lead to loss of power or bogging down?

A clogged air filter can significantly impact the performance of a snowmobile by restricting airflow to the engine. The engine requires a proper air-fuel mixture for combustion, and when the air filter is blocked, it disrupts this balance. This can lead to insufficient oxygen reaching the engine, which may cause it to bog down or lose power during operation. The engine might struggle to maintain optimal performance, especially under load or when accelerating. Therefore, addressing air filter issues is crucial to ensuring the snowmobile runs smoothly and efficiently.

Excessive weight on the snowmobile can affect handling and maneuverability but does not directly correlate to loss of power in the same immediate way. Outdated registration is an administrative concern and does not impact engine performance. Dirt on the skis may influence traction and control but is not a factor that would lead to a loss of engine power.