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Nothing was changed at all. I simply noticed higher rpms along with louder operating noise after 11 years of use.

Toro Push Lawn Mower 20333. Serial number 311037736. Year 2012. Briggs and Stratton 128T02-3256B1. VERY loud when idle. Seems like excessive rpms. I checked/cleaned muffler, thermostat/choke, intake manifold, carburetor, not leaking oil, not smoking, starts great, cuts and drives nice...