this is more for my lower unit and i dont know what the part is but i will explain it the best i can well there is a piece broken off my lower unit right where it attaches to the upper unit. it is partially attached to the horizontal piece where they both connect. it is on the prop side and it runs about 3 in. down from the horz. piece. it seems as though i can get this motor to run fine but i think this is causing a problem and it would run better.