I was working on my pontoon (it has a 1974 Evinrude 85 85493B) today, trying to get the remote control to shift smoothly. I tried to get it to shift to into neutral, but it would not engage. I could go forward, but I could not get it to go into neutral or reverse. I disconnected the shifter cables from the engine, but the shift lever still would only go into forward (though it was very stiff). Is there a way to clean and lubricate the shifter cables or do I just need to replace them. If I need to replace them, what model shift cable should I get?