250cc harrison question

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hi all,

welll i may be getting wet again this time in the 250 class. i picked up an '84 250cc kay harrison yamaha, etc on a pugh hydro. the number on the boat is f7. my question is this.... there is some contraption on the stack side of the engine that looks like it is connected to the stacks somehow. as the stacks go back the contraption moves. i've attached some pictures of it and was wondering if anyone knows what it is and where it goes? i thought it attached to the bar on one of the stacks but it won't fit. any idea who had this rig in fla and any way to contact him?

thanks for your help. lock haven here i come. also bringing the quincy a looper and takinfg it for a ride alomg with a 125 quincy z engine. i starting to feel like bobby thornton. reffing a high school football game friday night then driving to lock haven.

frank