Mowed a lawn today with it, ran for 20 min then started revving it's guts out , then stopped.. Need to change carb............
Before pulling apart the carburetor, you might want to check the fuel tap for flow first. My PT mower displayed those symptoms the other week. It would run fine until the fuel in the tank got to a certain level well over the fuel filter stick, then it would behave as though it was running out of fuel (revving then stalling).
I scavenged another fuel tap assembly off a spare tank and it ran fine all the way to the bottom of the tank after that.
