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For all others with String trimmers, blowers and other 2 stroke style engines...
If no power on high, tends to bog, won't run once choke off, check these:
Fuel Filter - It's IN the Gas tank; Just replace it
Spark Arrestor at Muffler, it's a screen that tends to clog up and causes very restricted exhaust flow
Spark Plug - again just replace it
Carburetor, clean or install rebuild kit
And adjust sorta hidden High/Low carburetor adjustment screws
Try changing the fuel filter and if that dont do it there is a small screen inside the carb that usually plugs up carefully disassemble it and clean it out with a good brand of carb cleaner
It sounds like you need to adjust the fuel mixture screw in the carb. To do this, while it is running adjust the screw in either direction until it runs properly without the choke.
could be but lets try some other things first
On the carb. you have a primer bulb have you pushed that several times and is there gas in the bulb itself?
Are all of your fuel lines intact and not broken or brittle including the primer bulb?
Are you using fresh fuel mixture?
Be sure your stop and run switch is in the run position.
find your air filter and remove the filter itself
then you will be looking at the inlet side of the carb.opening and a orange choke shutter
Take a thimbles full of mixed fuel and pour directly into the carb opening with the choke off( turn trimmer on its side to do this)
now with everything (except for the filter) set to run try to start your trimmer 4 or 5 pulls
does it try to run? runs and shuts off? if so then you have carb. issues
which you can either replace or rebuild
sometimes if you do not want to tackle it yourself then it is less time consuming to replace it
but not cheaper.
Try checking the fuel filter, not sure of the exact location but should not be to hard to find. Try looking in the gas tank if it's not readily located. If small 2 cycle engines sit for any length of time ( 30 days or so) with fuel in them the filters can become clogged. If your not going to use it for extended periods or storing it for the winter make sure you drain the fuel tank and run the carburetor dry.
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