Just had to put my Redmax Trimmer in the shop. I have had it for 3 months or so and on Saturday it just had no power and would just about vibrate out of your hands when it did throtle up. I called the shop this afternoon and he told me that the muffler was stopped up. He said that the fule mix maybe worng (all of my other stuff is running fine on the same fuel can), or that leaving the fuel cans in the heat could cause evaporation of the fuel but not the oil, or not running the unit at full throtle. Is this right???? Just sounds like a bunch of crap reasons. He said that he can just clean it out and it will be fine???? Just currious. I am faithful to this dealer but there is a new shop manager that I have not had the interaction with enough to konw if he is full of it and feeding me a bunch of bull or telling the truth. Let me know wise ones if these are reasons that a muffler would clog up.