From the information you provided me I was able to confirm the pistons in my tractor are indeed "gas" pistons. I also checked the position of the throttle lever on the column (which has not been moved since the compression check) and discovered it was at about half throttle. Makes since because it was slowly backed into the shop before being torn down. I am assuming because of this my compression reading is not quite accurate. I plan on installing new piston rings and removing the valves and checking the seats. If they appear to be in spec I will just lap them with grinding compound and put them back in. I see there are several brands of piston rings to choose from. Any suggested brands I should look for or avoid?
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