Sthil FS250


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Old 06-26-14, 12:13 PM
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Sthil FS250

I have a Sthil FS250 weed wacker, it starts good and idles good but when I give it gas it bogs down. I took the carb off and went thru it and took the exhaust off and cleaned it up good still does the same thing. It would idle all day if I let it. Any help would be appreciated. Thanks.
 
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Old 06-26-14, 05:32 PM
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Turn your high speed (usually marked "H") in a little to see if that will snap it up.

That leans out the mixture. If that works then hold the throttle fully open and adjust that screw for max rpms, then back it out 1/16 of an inch. That will give it a little richer mixture for lubrication.
 
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Old 06-26-14, 07:25 PM
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Did you try it with the exhaust removed completely just to be sure it's not related to the muffler? Did you check the exhaust port in the cylinder for carbon buildup?
 
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Old 06-27-14, 08:01 AM
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Yea ran it without the exhaust and the port looks clean. Can't find the "H" only a "Lo" tried that no go.
 
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Old 07-03-14, 09:33 PM
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I have a Stihl FS45 that is doing exactly the same thing. I even replaced the carb, plug, and fuel filter to no avail. Did you ever find out what was wrong with your FS250?
 
 

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