Air bubles in the oil return

[Langhuber]

Hello everyone,
I have a problem where I do not know what to do:
The oil flow (return) on my bike is riddled with air bubbles. I never noticed this before, Iin my opinion  this was not the case in the past. Since my oil lines are interrupted with a piece of clear plastic tubing which I have now replaced  after a long time, you can now see the air bubbles in the return. Also, the oil pressure (I think) is not very high, if I take out the check valve in the camshaft cover and run it, I can easily hold the opening with my thumb.
So my question is, is this  "normal" like this or do I have a problem with the oil pump? Of course I don't want to break anything, but I also don't dare to drive anymore....
I would be very grateful for any help.

[rhyatt]

Completely normal bubbles in scavenge line.
All British bikes have a larger capacity scavenge compared to the feed side.
Designed to keep the crankcase clear of oil.
If left for a few days, there will be a solid flow which will then become oil and air bubbles

[Langhuber]

Hi Rhyatt,
thanks for the quick answer. then I will go for a small ride this evening

[B44R Victor]

If it doesn't have air bubbles in it when its running, then you're in trouble.  Bubbles coming back in the return oil into the oil tank confirms oil is circulating.

[Langhuber]

Hi again, after riding the bike for about one hour it still is running, no strange noise from the engin or anything strange, so I think everything is ok. After changing from Magneto ignition to a Thorspark kit it runs much more stabel and doesn´t die when stoping at a red light. Even starts right away when hot.