Another addition: I checked and cleaned the carburettor, float level, needle positions etc. I lowered the needle of the secondary carb, the create a leaner mixture. This helped a bit, up to now no dangerously white spark plug. Also not total solution to the problem. Position is now in the middle (third notch of the five). By the way, it is the 55W model, so no membrane but a kind of metal piston.
I do not dare to lower the needle more, would this possibly be the solution?
Auke
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