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1964 YA6 Autolube Pump Air in Tube

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Good Evening. I got my 1964 YA6 running and on the road. I can't seem to be able to stop air in the tube. I rebuilt the pump. New seals etc. Bled the pump. When the bike is running if open up the oil pump and slightly open the throttle I can get oil pumping through with no visible bubbles / gaps. If I let it idle it will eventually start to show air gaps etc. Any thoughts would appreciated,  cheers 

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