I have a homelite ST155 string trimmer, after it warms up it won't run well and lacks power. Any ideas?



Answers:
Clean the air filter. When they get really dirty it's just like having the choke on.

Other answers:
change the spark plug then check to see if your using the wrong gas mixture you might be too rich or not rich enough
change the spark plug then check to see if your using the wrong gas mixture you might be too rich or not rich enough
After it warms up, a clogged air filter would do it all the time, so would a plug.... I'd say it has a air leak opening up when its warm (it can do this).. this is dangerous to a 2 stroke engine, it causes a lean condition and can burn it up (not only causing it to run bad) main causes are a leaky crankcase seal, loose carb, or loose cylinder.
Did you make sure to open the choke all the way after warming up?
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