I have a 79 Johnson 150 model 150TL79C. I don't know if the motor has ever been decarbed and I have never done so either. My question is would it be worth the effort to do so or am I just wasting my time? I have talked to a couple of people who all own newer boats and they mentioned that it might cause problems with my motor being as old as it is. It runs good now but was wondering what would be the pros and cons of decarbing it and could it cause problems with the rings or compression etc?