I just purchased a 1995 Sylvan Pontoon boat w/this motor attached. Right below where you take the top cover of the motor, there is a peice of the casing missing. It has been backed up against somthing and has broke this piece off the motor. Will this affect how the motor runs? Should I cover it with something? It looks like tape has been over it in the past. How much would it cost to replace this part? Thanks for your help!