What might be a cause if the engine won't start?

An empty fuel tank is a primary cause for an engine not starting because the engine requires a sufficient supply of fuel to operate. If the fuel tank is empty, there is no fuel available to mix with the air and ignite in the combustion chamber, which is essential for initiating the engine's operation. Regularly checking the fuel level ensures that the engine has the necessary resources to function properly.

While other factors such as a weak battery and a clogged fuel filter can also prevent the engine from starting, they pertain to the condition of the electrical system and the fuel delivery system, respectively. Cold tires, on the other hand, have no direct impact on the engine's ability to start but may affect the overall ride and handling of the snowmobile once it is in motion.