Carburator: Walbro 24
After warming / running up for a few minutes, the idle varies between 2100 and 2400, continiusly increasing and decreasing slowly.
I had the engine in for service with the distributor, but the idle is still like this and has been since I received the engine brand new.
Any ideas? I don't think it's the fuel system as I've replaced all tubes and the 2 filters. The colour of the spark plug is okay (light brown).