when I use the engine for more then twenty minutes on half power or some more, the engine drops down on one cylinder and makes strange noises like a second burn in one stroke. When I go back to idle, the engine runs smoothly. After 10-15 minutes cooling down everything is back to normal. Could this be possible by using the wrong oil/gaz quantity? Is anyone able to tell mee what the oilquantity should be? 1:50 or 1:75 or 1:100 (in liters)
