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I had one on my last boat. I took it apart very carefully on a clean bench. Watch for locations on the two checkballs, critical that they go back in the same spot. All of the seals are standard O rings which are available from many sources. I carried all of mine to a hydraulic parts company...

There is another discussion from an older, recently revived thread about this subject here: https://forum.tinboats.net/viewtopic.php?f=4&t=35560

I had the same issue with a 1976 9.9 that I purchased used. The compression test showed 115 on each cylinder. It had been sitting unused for several years. I replaced the coils, plugs, points, condensers, thermostats, and water pump as they were all original. Also rebuilt the carb. All was...