I had just received my new Echo 413. I used the oil that Echo supplied, mixed in a 1.gal can as instructed and filled it up. It took about 15 pulls before it fired (even after priming) and ran fine for about the first two residentials I did. Now it doesn't't want to start, even after it's warm, and I still have to choke it all the time. When it does start on choke I'll flip it off and it will run for about 30 seconds sputter out and die. when I manage to keep it running it runs like a cold blooded BiT*H. Did I just get a lemon or is this common with this model? I've got a PB46 with a ton of Hrs on it and it fires on the first pull every time, but that takes a while for it to run top speed until its warm. Any suggestions???????