I've decided the loping problem is going to remain as long as I keep taking shortcuts, adjusting idle, etc., and am going to do a carb rebuild.
However, B&S refers to a carb mounted fuel pump and mine is mounted on the firewall, or whatever the tin is between engine and battery area.
This is for engine model 422437 type 1209.
Manual calls for a #491539 overhaul kit.
Is the kit going to have the parts for fuel pump and all or separate issues?
I did receive a response from another member who also had a photo of a carb similar to mine.
I'm thrown by the pump location not being on the carb.
Also my carb is the one with the idle mixture adjust screw and fixed main jet.