IMO.Shell Rotilla 30wt, Citgo SAE 30wt, you can check with member Kartgreen as he has a great source for vintage blended oils. A straight 30wt diesel oil is best as it still has some zinc additives.
You might want to check the clutch adjuster. If it has not been cleaned and re lubed it might be your trouble. Old grease gets hard and could bind up the assembly.
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