how much oil should be in there if any ??
Some. There is no seal on the #1 main bearing, so some oil can come out and drain back from the stator compartment into the crankcase. What there is will lubricate the starter gear by splash, I was quite surprised when I changed the 3 screws holding the alternator stator and didn't tighten them enough - I put the bike on the side stand after a test ride and oil ran from the screw holes, luckily alerting me to the problem before any damage was done to the stator.
