If you look on the carb you will find two screws next to each other. Find the one for "hi" and that is the one you need. Start the engine and warm it up. When you are ready, take a screwdriver of the proper size , press the lever to go to high rpm's hold the throttle down. Turn the screw for "hi" in slowly until the engine starts to lose even more rpm's. Open the screw slowly until you get max rpm's and keep going until it starts to lose again. Turn the other way about half way between. If that was the problem, you should be done. Good luck...Lee
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What make and model is the trimmer? We need this information before we can advise.
Before you adjust the carb, check out the spark arrestor on the muffler. I had same problem, it was clogged up pretty bad. I cleaned it in mineral sprits, air it out with compressor. I was like a new trimmer. Problem solved
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