[alanwoodieman]

Stromberg carb, so I would think too large jets, back up and take a picture of the engine head. take the air cleaner off and make sure it is not clogged up, It appears to be a dry type and the "cleaner" part of the air cleaner is a wrapped up bunch of fiber mesh just under the top cover ,remove wing nut and take it off and then remove this and see if the richness goes away