From the official Sask online snowmobile course:
Drive guard – Every snowmobile is to be equipped with a guard for the drive chain, belt or shaft that is securely mounted and positioned to prevent injury to the driver of passenger.
If the snowmobile is driven by a propeller, the vehicle is to be equipped with a guard or shield over the propeller that is securely mounted and positioned to prevent injury to the driver or passenger.
Drive guard – Every snowmobile is to be equipped with a guard for the drive chain, belt or shaft that is securely mounted and positioned to prevent injury to the driver of passenger.
If the snowmobile is driven by a propeller, the vehicle is to be equipped with a guard or shield over the propeller that is securely mounted and positioned to prevent injury to the driver or passenger.