Today I was doing spring maintanance on my John Deere Z225, B&S engine Nikki 902 carburetor. As I was reassembling and installing the carb, I was connecting the throttle and choke connections. Does anyone know how or why there is a rod that hooks into the choke, the other end is an long U shape that slides through a slot in the mounting bracket. There is no connection of this rod to anything that would move the choke.