Starts but wont run with choke off - Craftsman 25cc Gas Line Trimmer

You should only use choke until you get a turn over. After that, turn off choke and it should start right up.

Main jet dirty. Likely Ethanol fuel fouling. Remove and clean jet. Check all rubber tubing to/from carb for cracks/deterioration and replace.

remove the muffler and run it the mufflers plug up and restrick the exhaust some mufflers you can open and clean the screen

there is no "choke". it needs 13psi to run, check fuel filter and pressure.

the motor wont rev high on choke.the motor is suppose to fire once on choke. then turn the choke off.pull the start cord and the motor should start and run.check that the throttle conrol is on full. it should run fine.

first drain the carby, then set your air mixture screw 2 turns out, from the fully turned in position. The starting proceedure is as follows, when the engine is COLD, turn on fuel, pull on the choke fully, and kick the engine over. DO NOT use any throttle, when the engine is cold, and the choke is on. Remember Choke on, NO throttle.
When warm, no choke, and a little throttle when kicking.

check the vacuum choke pull off-the round piece connected by rod to the choke see if the rod pulls back into the round part when running,the vacuum diaphram rots and wont pull back to open choke

To start up a cold engine requires reach mixture (air-gas).In your case it seems like the choke is not working ,so cold engine cannot start.If it is an injection operated system then it must have a temperature sensor which suppose to turn the choking on when cold engine needs to get started.Either the sensor is faulty or the choke or between the two there is a faulty connection somewhere.

You need to completely drain and refill the gas - the gas you have is stale and doesn't have enough power to run the bike.
The battery needs to be fully charged - not just jump started. It wouldn't hurt to do an oil and filter change as well as a air filter and plug change.