Saw is running again. It was the sleeve over the crankshaft on clutch side...put it back in. Saw's running. No ordered the oring which is missing under the sleeve.
Found out, that there seems to be a bit over-pressure in my oil-reservoir. Checked the vent. Works. But the tank is 1/3 full. Maybe i got overpressure because of exhaust heat extending the air inside the tank?
If the crankcase seal is not tight, the crankcase would suck oil instead of putting pressure into the reservoir, right? Where the crank is running, theres vacuum for the gas-oil-air mix to be put into the compression chamber...i thought.