how do I fine tune the carb on a mid 70's evinrude 25 hp. I am selling it and I just want to make sure it is running good. There is a lean/rich knob, but is that the only adjustment on this model. Are there any other screws to adjust? If the rich/lean knob is the only adjustment what is the rule of thumb on gettin it in the right position? Just till it sounds good? If I remember right, it isn't idling quite right, so I was wanting to adjust it so it gets more fuel at idle. It almost dies when shifting because in order to shift I have to idle it down to the point where it wants to die. can this be solved with the lean/rich knob?
