Hey Tex,<br />A good way to establish the model year of an Evinrude is by using the following cheatsheet:<br /><br />I N T R O D U C E S<br />1 2 3 4 5 6 7 8 9 0<br /><br />The last 2 letters in model # indicate year of motor. In your case, C=8 O=5 or 1985. <br /> <br />Backlash