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A Force 85 doesn’t have much street value, so pros know that they will quickly exceed the value of the motor, if they try to fix it. The fact that it has compression on all three, with the symptom you describe, kind of surprises me. They lost piston rings left and right.
It’s always best to do an open gap, cranking spark test on all three cylinders at once, if you have the proper tool. However, you can try this….Run the motor for awhile and then remove the spark plug on the questioned cylinder. Tap it in the palm of you hand. Is there water? You might have a leaking head gasket. Is it dry? You might have a bad carb. (I believe that has three carbs, right?) Is it wet? You might have a flooding carb or a leaking fuel pump diaphragm. If it’s dry, you might also have a bad reed but that’s a long shot. Write back with results of this test.
Long live American manufacturing!