I have a 27 hp V-Twin B&S on my ztr. I cut about 1.5 acres yesterday and all was fine. This morning, I started it to cut some more and it began "surging" or cycling. The rpms did not fluctuate but the sound of the engine kept rising and falling. Also, the engine did not sound like it was running as fast as the tach was reading. I cut about .5 acre without a problem except for the surging. The air filter in new but the fuel filter could probably be changed. The gas (no ethanol) is 10 days old. Has anyone else had this problem? What was the cause? Thanks.
Norm
Norm