busmec2001
I predict that there is absolutely nothing wrong with your oil pump.
As I mentioned, the oil level in the sight window doesn't drop a lot when the engine is started.
There isn't really any place except for the partially filled oil filter cavity and a couple of small drilled oil passages for the oil to hide in.
Once these passages and the filter cavity are filled the oil level will not drop any further.
When I was talking to the dealer after I had done my first oil change I mentioned that I was concerned because of the amount of fibrous material that was blocking the pump inlet screen and the low oil pressure it might have caused.
He said, "You did not have low oil pressure.
If you did have low oil pressure you would have shut the engine off immediately. The hydraulic lifters would not have pumped up and the clatter would have been so loud you would have thought the engine was about to fly apart.
When I (the dealer) replaced some parts in a UCE engine I accidentally plugged up the oil supply to the upper end. When the engine was started I've never heard such a clatter!. I repaired the problem by unblocking the oil transfer hole and with that done everything was fine."
I mention this because it might give you a feeling for what would actually happen if your oil pump was failing.
Don't worry about it. Your bike is fine so go have some fun on it.