After an oil and filter change measure 2.3 litres of oil . Add around 1.8 litres to the empty tank , which fills it to the brim.
Start the engine and after the rattling stops add the other half litre.
You now know you have the correct quantity of oil in the tank.
Go for a decent run to warm up the engine , and pull over on level ground without stopping the engine.Keep the engine ticking over.
Hold the bike as upright as possible and look at the sight glass.
The oil level will be right in the centre , just where it correctly should be.
I havnt found any other method of checking which consistently gives this correct result.
With a dry sump engine the important thing is to have sufficient space in the tank to return the the oil from the sump when the engine is running.
Using this method you can be certain that you have.