I have tried 210's, 225s and even the pro 230 and I cannot get a echo weedeater to last more then 5 months!!! I use it for commercial use 5 days a week and these things start to go out. I change the plug, air filter every month if not more and use echo synthetic mixing oil. What happens is the motor will start bogging (not reving as high). At first the motor will store to lose power but I can still find the sweet spot with the string length but this only works for about a month until it will barely spin the head. Also right when they start to go bad, they will run decent for weedeating but when flipped upside down to edge, it will lose almost all power and barely spins but will regain power when flipped back to normal position. I even changed the carb on my last echo and it didn't fix the bogging problem. Does anyone know why these motor's start to lose power and how I can maybe fix the engines when they go bad? Any help would be appreciated.