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Hi $wim, it's good to meet you. Being able to set the idle speed will be necessary at some point, even it not now, so you should get that adjustment working and go from there.
I don't know if this applies to the 250 carbs, but with some motorcycles I have, it's possible to get the slides in the wrong way, and in that case the RPM runs away like you're describing. I'm just guessing though. An air leak between a carb and cylinder head, as mentioned above, could also do this. A hung up throttle cable or linkage is another possible cause.
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