I have a troy-bilt trimmer 2 cycle 25 cc. Bought gas (no ethanol) at the same time and used the free sample of oil in the box. First time I used it was used it died and would not start. Next day I started the trimmer and it died again. Checked for spark, OK. Not happy. Still have not been able to finish my trimming. Tried to take it back, but it was more than 7 days and had gas in it. Never had a problem with a trimmer out of the box before.