Re: 1980s Evinrude 8 hp throttle

[Don]

OK, the third picture is of a different engine, got it…
Had another look at your second picture and noticed that the roller appeared to be at the end of the throttle cam….So, my first bit of advice was wrong, especially if you didn’t unthread that plastic collar…I guess what I am saying is that based on your picture, which may be deceiving, it would appear as though the throttle cable is pushing the mag plate to its fullest advance position. Needless to say, you can simply pull the anchor bolt back out of the plastic collar, then attempt to advance the mag plate past where it is in your picture…It just seems like the roller will fall off the end of the cam if the mag plate is advance any further.
I would pull off the plastic air box assembly and have another look at the carb/roller linkage. It doesn’t seem possible to have assembled that incorrectly, perhaps the plastic roller piece is cracked/damaged causing incomplete opening of the carb butterfly. Did the little cam pick up screw/adjustment fall out of the plastic roller piece? If so, this might explain why the butterfly isn’t opening fully. Is the plastic throttle cam (mounted to the mag plate) somehow broken, perhaps the rivets have come loose on the mag plate retainer causing it not to engage the throttle cam roller properly…