Hello,
I have a 16HP 42" Craftsman Lawn Tractor, 6 speed
B&S 31C707-0230-E1
It was running rough, and I bought a new carb from Amazon ($30) and put it on, the engine ran great, I cut the grass, and it never sounded better.
Next week, started it up, and it sputters, backfires, and runs...