This Manuals Collection is often linked lower left on the ITCL page, sometimes just off screen.^ International Tool Catalog Library - home of archive.org
archive.org has a "Manuals" section on their site.
Well worth having this manual handy (digital or paper) when working on these older Briggs engines. Really great resource.
You should adjust a carb to how it will be ran. The air filter restricts air and will make the engine run richer than without it.Without