Having low compression on these bikes is not an everyday occurrence, that is to say it's rather unusual.
Let us know that this is how you did it. Kind of difficult to do remote diagnosis.
So, 10w40 oil, warm engine, all 4 plugs removed, throttle wide open, then install compression tester and get a reading from all 4.
Then do it again but this time squirt some oil into each cylinder just before you install the tester.
Make sure to write down each reading as you get it.