This is a 20HP Mercury, Electric Start, Long Shaft Outboard, manufactured in 1980, S/N: 5607390<br /><br />After shifting the motor into reverse, it doesn't want to shift easily back to neutral. When it does disengage, it doesn't want to shift into forward without some effort. I recently changed the gear lube in the lower unit. I bought this motor a while back and have only used it a couple of times, so I don't have much history with it. This problem seems intermittent - other times it seems to work OK. Any suggestions or information would be greatly appreciated! Thanks in advance!