Thanks George for countenance. Maybe i'll change the oilpump next winter, when i'm going anyway learn to do the maintainance for the bike.
The only problem i've got until now (bought the bike last monday

) is that the engine gets easily extinguished when i slow down for trafficlights and roadcrossings. I have tried to increase idle-running from the screw on carburator, but that dont help.
Markus