Small Engines (Lawn Mowers, etc.): Weed eater blues, aircleaner, carburetor

Question
I have a 4 stroke Yardman weedeater, model YM26CS.  Today I was using it and all the sudden the motor died (fully warmed up).  I can only get it to run with the choke fully on, and when giving it throttle it will barely increase RPM's (with choke fully on).  If I start to move the choke lever (1/8 of an inch) to turn off the choke the motor immediately shuts off.  Do you have any ideas why this has happened?  I checked the aircleaner, and spark plug and it looks fine.  Plenty of fuel in the tank.  Any guidance on how I can fix this please let me know.  I have never had any problems with this before, the only maintenance I have done on it is change the oil once a year.

Thanks for your time, Travis


Answer
How old is the trimmer?  We haven't had a lot of these trimmers in the shop but I would start with the carburetor.  Are there any adjustments on the carburetor?
Do you have the model nubmer and serial number so I can look up the manual?
Your model number should be 41AD26CC901 or very similar but I also need the serial number.
Eric