It was possible to measure the compression on two fans and a trimmer. Two were low and one was good. Checked for sparks with a spark tool on a blower with good compression, it turned out to be sufficient so I started looking elsewhere. I noticed that the carburetor was loose and tight. The engine started straight away. Most likely, the trimmer and other blowers will be thrown away, since engines cost more to repair than to buy new ones.
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