There is one thing that most people do not even think about, Walbro carbs are made for chain saws, Not model airplanes.

A chainsaw does not worry about a mid range, They are either setting and running at idle or being run wide open.

I think most of the engine manufactures have done a pretty good job using something that is made for one application and making them work for another.

So far I have not had a engine that i could not get to run rich enough on the high end, Getting good throttle response and mid range is the hard part.

Milton