Our trimmer broke down on our second job today. It started then it just stopped and it could not be restarted. We took it back to the shop to check it out and could not figure out what was wrong. We took it to the dealer (Great people). He tryed to start it....couldn't. He then removed the spark plug and he said it needed to be changed. He changed it and sure enough it started. I told him that we just changed it just last week (about 30 hrs of use on the plug) and that we were told to change it at about 50 hrs of usage. He then asked if I used the trimmer "wide open" and I said not always, mostly at about 3/4 open. He then said that 2 cycle engines need to be ran at idle or wide open. It confused me since my motorcycle is a 2 cycle engine and I don't run it wide open. Is the guy correct in what he is saying or did he just mean trimmers not 2 cycle engines need to be ran idle or wide open. We have Shindaiwa T260 trimmer.