tors is a safety feature incorporated into the cdi units that basically retardes the engine so it cant rev past 3000 rpm. theory being that the clutches wont engage in that rpm range so your sled wont go for a "ghost ride". there are 2 switches involved with the system. one is at the carb, carbs, or carb rack. the other is located at the throttle perch, inside, activated by the flipper lever for the throttle. take a look and you will notice the pin holding the lever in place actually sits in an elongated hole. most common cause of the tors to activate is an issue with the throttle cable itself. tors will not activate until the engine has the chance to return to idle. at that point, if the switches detect any abnormality, tors will activate. first thing to be concerned with is that the idle is set at the proper rpms for your sled. next, confirm the fact that there is at least 2-3mm of freeplay in the flipper prior to pulling the carbs open. this measurement is taken between the flipper and the perch. hood up, watch the carbs, slowly apply the throttle, when the carbs start to open, measure the distance from the lever to the perch. any less than 2mm and the system will activate. you can test your tors system simply by pushing back on the pivot point with the sled running and applying throttle. occasionally a bad switch may be to blame for activation. the switch on the carbs has a pair of wires, one black, the other black w/ yellow stripe. connect you tester to these leads and pull the throttle. throttle on-no continuity. for the perch switch, unplug the white connector under the bar cover, same black-black/yellow, activate throttle and you should have continuity. to temporarily by-pass the tors system for troubleshooting purposesm simply unplug the bullet connectors at the carbs and plug them back into themselves. meaning the pair from the carbs into each other and the pair the carbs would have been connected to into each other. the carbs dont care, this was just to avoid confusion. its the wires leading TO the carbs that matters. hope this clears the air on TORS.