The water expands and pushes out as the tractor warms up. It takes approximately 10-15 minutes before this happens.
If you keep filling it right to the top, it will keep pushing water out in a never-ending cycle. It is NOT overheating!
The proper fill level for a Cub radiator is just enough to cover the fins. You will have to shine a light into the radiator neck and look in at an angle to see the proper coolant level.
Cubs do not have a water pump or thermostat. They use a "thermosiphon" system where the water circulates by convection; hot water rises, cold water sinks.
Your power issue may just be a bad memory. The engine is probably down on compression, though, due to sitting so long, and running it will get it loosened up again. Ignition probably needs refreshing too. Valves might stand an adjustment.
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