Small Engines (Lawn Mowers, etc.): Stil FS76 Trimmer, diaphrams, fuel filter

Question
When opening throtle engine dies. Sometimes if machine is cold it will run fine, but then when is hot it turns off when opening throtle.

I had removed fuel filter and it did run fine for a while. Now problem still present.

I seen the spark and is good. I have no idea what can be wrong.  

Answer
It sounds like an adjustment to the mixture screws (side by side on carb).  start with both screws at 1 1/2 turns out from lightly seated.  With the engine running, open the throttle fully and adjust the high speed mixture farther from cylinder until max RPM is reached...then open (CCW) 1/8 of turn.  Adjust the low speed screw so there is no hesitation when going from idle to WOT.  If this doesn't correct, you will need to clean the carb (and replace the diaphrams) and inspect the pulse hoses and gaskets.  Hope this helps.