I have just run into a similar problem in the Briggs 500E series engine with the plastic carb. I will have to try this. The spark plug indicates it is running a bit lean. I have drill out brass jets before using the Harbor Freight micro drills. I find you can drill it by hand, as pointed out above they can break very easily. 10% larger sounds about right.
What RPM do people set these up to idle at? I have not seen a spec. anywhere.
What RPM do people set these up to idle at? I have not seen a spec. anywhere.