I have a toro super recycler model 20057. It doesn't work that hard as I only have 20 lawns, its less than 4 months old. Anyway, it was chugging on me till it stopped working, I ended up cleaning the air filter as best I could and also the spark plug it was black with carbon. I also have been changing the oil regularly enough. So it happened again today, the spark plug was blackened with soot and it was chugging and blow black smoke now and again. I cleaned it up and just a few hours later it stopped working again, almost as if it had run out of gas. The spark plug was black again, just after a few hours... also when I was trying to start it, it siezed up a couple times as if the blade was plugged up with wet grass but it wasn't so I'm not sure now. I hope it's not a broken engine (don't mean to get technical) I can't get it going and I'm looking for suggestions I do believe the 5 year warranty covers it unless I did something to void it.. any suggestions or advice?