I have never done anything to engines other than an external clean but am comfortable with following guidance on trying to fix things.
Basic symptom - engine won't start/kick over on my groomer. Of course I found this out after I had a ton of sand in my driveway! It's a B&S 3hp 091212-1025-E1 and I've now got the parts and operations manuals from B&S.
I recall @Bonnar_Bloke mentioning something about diaphragms in carbys becoming stretched - is this what mine has done? Spark is present.
My mower is also a B&S but the 475 model 093312-1155-B1 and it wouldn't rev up. Talking to the metal work boys here they explained the bowl and how it all works and I was able to clear the jet and get it back to normal.
