I have a 1990 Johnson 115 Hp, XL length. I bought the engine 3 months ago. It runs OK, but I could never get it to shift into reverse. I finally broke down and removed the lower section to set the shift rod height according to the manual. I put it all back together, trailered the boat to the water, put it in, and reverse finally engaged! But, when I went to shift to forward, nothing happened. It would not engage in forward. So, I took the boat back home and removed the lower section. I could get 3 distinct positions with the shift rod (reverse, neutral, and forward), but forward would not engage when I spun the prop. Reverse would engage, and neutral was free, but when I lifted the shift rod into the forward position, the rod moved, but it would not engage the prop! Does anyone have any ideas on what I need to do?????