Ok, I'm not admitting defeat on this one, but i am calling in reinforcements.
My father dropped off a Husqvarna 223l string trimmer at my house and asked me to fix it. He owns a landscaping business, has zero patience for messing with this kinda stuff and breaks things ALL the time; so this is a common occurrence. Usually i get around to looking at them in the evening, call him with w/e part is needed and next time he's at John Deere or Stihl vendor, he picks it up.
So fastforward to this 223L. He drops it off, says it has problems, won't start anymore, doesn't have that many hours on it, even when it did run, it ran crappily.
I figure it's something screwy with the carb. Jets are all working as they should be, diaphragm isn't damaged, butterflies are moving as they should be. So then i go about a number of other things that i'll list below to save time.
New Spark plug adjusted to factory recommended gap (tested against the motor and it does fire when pulled)
Cleaned airfilter and intake box
Strong compression
No blockage in the exhaust
I've tried it with no airbox or exhaust on it and still nothing. By nothing, i mean not even a sputter of it firing.
::UPDATE::
Alright, so i finally bought a compression test kit and it's 60psi, so the thing is boned. Now i wanna know, what the hell causes this? My initial thought is bad seals, but it's only around a year old. So impart some wisdom on, what causes these things to nose dive like this?