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sounds like an air/ fuel mixture/ratio problem.there should be two screws side by side near the carb. crank trimmer and slowly adjust screws, in or out, till engine runs smoothly..
Use the 50:1 ratio oil mix.the oil bottle will tell you how much oil that you will need to mix with how much gas you have,40:1 will make the trimmer smoke too much and it will foul plugs prematurely but won't hurt the machine.
most trimmers are 50:1. or 40:1. i would use synthetic 2 cycle oil and use the 50:1 ratio. i know guys with trimmers that require 50:1, and they use synthetic at 80:1 with no problems for years. they say the engine runs cleaner. i am a part-time lawn care operator.
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