Needing the 2cool brain trust on a engine problem

I was running across trinity bay today and all of a sudden I lost almost all power. The rpm jumped up high but it was like I had 5he boat in neutral. I luckily had enough power that I could limp back in but anytime I gave it more than half throttle nothing but high rpm's. Anyone have an idea of what it could be. It's an older boat and motor (1994 evinrude 60) any feedback would be much appreciated.



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