in turn is attached to the throttle control cable 100 rotation between the throttle lever 134 and the throttle arm 136 is limited by a pin 138 fixed to the throttle lever 134 and extending into a slot 140 in the throttle arm 136 the purpose of this limited rotation between the throttle lever 134 and the throttle arm 136 is to absorb the motion of the crank arm 130 as it moves 30 degrees either way from dead center during operation of the shift mechanism to prevent the throttle control cable 100 from being moved during the 30 degrees of rotation of the handle 16 during operation of the shift mechanism a spring 142 is inserted between the throttle lever 134 and the throttle arm 136 to keep the throttle arm tight against the idle stop while the throttle lever is moving the spring 142 is mounted on corresponding tabs 144 and 146 on the throttle lever 134 and throttle arm 136 the throttle arm 136 is double ended so that the throttle control cable 100 can be attached to either end and be pulled or pushed to increase engine speed in the desired manner this makes the control unit 10 useable for a variety of different engine throttle linkages to permit a right hand or left hand control for installation on either side of the.