1971-1973 Arctic Cat Snowmobiles Factory Service Manual, Page 125Get this manual
TRANSMISSION (SALSBURY 910) General
A drive pulley (torque converter) is power transmission mechanism which transmits power from the engine to driven pulleyThis transmission of power is accomplished by means of V-shaped drive beltThe variable pitched drive pulley has one (1) fixed face and one (1) moveable faceThe drive pulley moveable face is controlled by roller weight arms and springs which change position in relation to the engine speed (RPM)When the engine is not in operation and when it is at slow idle, the distance between the fixed and moveable faces of the drive pulley is slightly greater than the width of the drive belt, resulting in disengaging relationship between the belt and drive pulleyAs the engine speed (RPM) increases, the governor weights are thrown outward by centrifugal force, causing the moveable face to move closer to the fixed faceAt this time, belt engagement occurs and power is transmitted to the driven pulleyRemove the large retaining nut, using an air impact toolRemove the ramp plate assembly which also includes locking tab