rough idle and engine stalls when moving lever from choke to run position; B&S 16.50 series

[kelazier]

If this were a car engine, I'd say it probably has a vacuum leak. That's less common with small engines, but I *have* seen it happen.

Thanks...I'll search for that, too.

 

[Richard Milhous]

Thanks...I'll search for that, too.

You won't find crap. It's a plague with cars, especially older ones, but mowers don't have those leak sources. I suppose a PCV leak is possible in some cases, but in reality it's either the intake/block seal or the carburetor/intake seal. Or, 99%, it's the carburetor and not a vacuum leak. Just saying: check the easy stuff first.