I looked up problems with my Echo PB251 blower and found this site. I took it in for warranty service under the 5 year residential warranty and got the std. response that that it was from "low compression due to bad fuel" even-though I use "toptier" gas and StarTron fuel stabilizer. Needless to say this is what I expected after seeing what happened to some members here. The machine was running fine until one day when I pulled the rope to start it. It sounded and felt like something actually broke and gas ran out of the muffler. What a worthless warranty, and I see nobody really gets any satisfaction from Echo.