I have a fair;y new mower with a Briggs and Stratton engine. The mower has always started reliably but this year it started sputtering right after st arting it.
I checked the gas cap, fresh gas, clear the air filter, and cleaned the car b with carb cleaner and Chemtool B12. Now the thing runs for 10 to 15 min utes like it is brand new and then starts sputtering. I have tried this ov er and over and it always starts sputtering at that point.
Really puzzled, any ideas?