Take the plastic cover off that covers the muffler and cylinder head. I've had 2 cylinder heads crack. The trimmer still ran but had little to no power and would not throttle up. First head cracked at the head bolts. The second one cracked above the bolts. The side that has the carb and fuel tank is harder to see and you must remove the carb and fuel tank to check. Also I've read online that this trimmer has a problem with the fuel line cracking at the bulb and in the tank.
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