I have a mid 80 in line 6 mercury. I bought a lower unit to replace the one I trashed last year. When I got it the seller showed me that it shifted into f-n-r. As in my manual it said that I had to turn the shift shaft just in the forward position with the throttle just out of neutral. I installed the lower unit and when I started it ,it took off forward. I tried to put it in reverse it still goes forward.Would this also cause it to be hard to start. Roger