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I had the same in the 90's on my 850, I was re-ringing it and got Hepolite Apex rings with the 3 piece oil control ring. The only way to get the oil control ring into the barrel was to shorten the corrugated expander ring, the 2 thin rings it supported did not need any adjustment but their ends would not get close to meeting without reducing the length of the expander ring. The rings are still in the engine to this day with no oil consumption between oil changes.