Had a problem once on a Ryobi string trimmer that was similar to yours , at first I thought it was a fuel flow problem , but it turned out that the throttle cable had stretched and wasn't right away obvious , so it was not allowing throttle to open all the way up (only halfway) , look at yours , the carb throttle needs to turn 90 degrees with trigger pressed
Clean carb
Testimonial: "Hi Johnny I have cleaned the carb also replaced the piston ring and plug, it is beter , but still revs only about half."
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