Abstract: A safety switch system for use on snowmobiles that eliminates the hazards of previous systems by providing series connected normally closed switches, one connected directly into the throttle control lever which the operator must press for increasing engine speed from idle, and the other mounted directly on the carburetor and controlled by the throttle control arm which is directly connected to the butterfly valve of the carburetor. The two switches are connected to an engine kill system, such as a ground circuit for the ignition. One of the switches must be open for the engine to be running. This means that when the throttle is open (the carburetor control arm is away from idle position) and the operator's hand is off the throttle control lever the engine is dead. However, with the throttle arm in idle position the engine will run whether the operator has his hand on the manual throttle control lever or not.