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I thank good for fuel injection. I spent many morning freezing my ass off messing with chokes

Im not sure if I replied yet, but check for good spark, it should be blue, and maybe adjust carb to run a bit richer., of course you probably know the other basics, like plug (proper one, or maybe try a hotter one), and use fresh fuel and stabilizer.

Also try riching up the carb setting, and check the valve adjustments

My husqvarna weed wacker has been rebuilt,- all except engine rebuild. All new parts icl. carb.After all this it still bogs down when I try to rev it up. Spark arrester is clean.I cant seem to get it to rev up when I adjust "hi" screw