I have a echo gas trimmer from HD that I've used for the past 2 seasons. This year it fires up but won't run long and bogs down. It requires the full/mid choke even after being warmed up. I am thinking it's related to the carb/fuel. It's hardly worth taking to a shop ($ 80 per hr is more than I paid for it). So - is there anything I could do to it - to make it run like before? I was thinking of tearing into it - and trying to clean it up ? Other than using fresh mixed fuel in it - I've had zero maintenance issues til this year. The carb has two screws. If I open it up and clean it up - is there anything I could mess up or ruin by doing so? I don't have a manual for it and have never worked on a carb before. Anybody ever work on a similar issue with their weed trimmer? Any advice?