Yesterday I notice a drop of oil on the bottom of the #2 cylinder head. Thought at first it was coming from the valve cover but after wipe and run of engine, the oil was present again. It does not appear to be coming form the valve cover but is forming at aft most cooling fin.
Thought it could be a blown head gasket but after research, there is no head gasket on the Rotax engine.
Pulled plugs and found them to be very black. Checked #4 ,they were normal.
After start up engine runs smooth as I remove the choke but them runs very rough for maybe 15 seconds then smooths out.
270 hours on engine