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The question I"m stuck with is: do you mean that the rings are sticking in the pistons or do you mean the pistons are sticking in the cylinders. I ASSUME you mean the rings are sticking in the pistons and the tried and true method of dealing with that is to put a heavy load on it and pull it hard. Combustion temperatures and pressures tend to break things free this way. Treating it with a solvent may help to break down the carbon sticking things but might also wash out the lubrication. I guess it depends on how stuck the rings are. Kroil is one of my favorite penetrant/lubricant combos but about anything will work. Chasing it (whatever you use for penetrant and/or solvent) with engine oil would assure good lubrication before you start it. Then give it a workout and get it good and warm. Most modern oils have detergents that help clean the engine. Once everthing is warmed up, cleaned out and working, change the oil (including draining the clutch) and it should be fine. Modern fuels and lubricants have a lot more cleaning action than was available when these tractors were designed, and as a result these engines will generally survive things that would scrap a newer engine in a few minutes.
The design tolerances, quality, and workmanship are superb, and it"s part of why I enjoy working on these wonderful creations. (my wife calls them something entirely different)
Hope this helps. Ken in AZ
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