Thank you for your compliment Sailfish,
now the engine is running fine, but it was a bit tricky to find a suitable carburetor.
the first carb I used was a Walbro WA80-1.
With this carb the engine was running fine at full throttle and idle, midrange and acceleration was very poor.
Now I have a new carb with integrated acceleration pump system.
With this carb you can run the engine several minutes at idle and then flick the throttle stick to full open without any problem.
Another problem was the spark plug, it was a BRISK ZKM1-4, this one is no good.
The name of the new one can I tell you tomorrow.
I'm cleaning my plane only when it is black from the died mosquitoes and not because of oil pollution.
