Since its been in storage for some time, it was important to take off all fairings and do a detailed once over.
And much like you I saw the air bubbles in the clear tubing (which I also upgraded from black to clear with this fear in the past of oil starvation...).
Started upstream to ensure good flow from the tank,
Purged air from the oil pump
Gave the tube that was slid over the nipple a tap...found the source
Air was seeping in from the nipple and the tube.
The wire pinch clamps that Honda could be better I think...upgraded to larger spring clamps...but the nipple didn't allow the clamp to clamp correctly...resulting in seeping air.
Countermeasure in the end, was to replace with new clear tubing and re use the Honda OEM wire clamps.
