If it ran good before and ran good when it was parked, I'd say you have stuck rings. I wouldn't use synthetic oil to break one in or run it in one of these old kohlers.That's my opinon.
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Brian
April 1979 1200 Quietline 44A deck 1988 1211 customized into a 1288 with a K301AQS 38C deck and a 1864 54” deck . Snow blades 42" and 54" . Brinly disk, brinly plow a cultivator and a $5 brinly yard rake!
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