I went boating today. I have a 92 140 evinrude. Before starting the boat i realized that i cannot shift in reverse when motor is off. I pulled it down harder and it shifted, but with some pressure. When i started the engine, i was able to shift in reverse easily. Forward always works good. I also noticed that sometimes starter does not spin unless i jerk the shifter back and forth. Is this normal for shifter to work like this? What is wrong here?