Im working on a 1989 Evinrude 15hp. I need to order a new carb top, the one ive got is warped by the timing roller. It does appear that it has been changed at some point, it has the cover with the plastic post to hold the roller on it. I cant find that top piece untill 1992. So im assuming that these covers will interchange, the bottom gasket is the same. I noticed that the needle valve has been adjusted by "bubba" with his pliers at some point in the past and the splines are stripped off. My needle valve on my 83 metal carb turns really easy but this one is hard to turn. For 1989 it shows the needle as obsolete but in 1992 there show to be two needles and one is still available. Are these interchangable?