2 cycle gas trimmer will only run if start lever is held down. As soon as the the lever moves to run (after about a minute) the unit shuts off under acceleration.

When mine does that I go back and reprime repeating the process. It seems the gas does not feed up fully with the initial priming effort. Once it starts I move the choke lever quickly on way or the other to see if I can keep it running until it gets warmed up. Sometimes I have to adjust the choke setting even after it has run for a while.

can u explain little bit clearly?

I don't think so either. I think you have crud built up inside your fuel tank, and it needs to be thoroughly cleaned inside, Your carburetor may also need to be thoroughly cleaned inside.

326 sl it runs for 5 mins and then dies out it acts like it is overheating it seem to be hot

These 4 cycle trimmers need to be primed 10x before a cold start. The bulb will feel *firmer* on the last two or three depressions and you'll know that the carb is primed.

Full choke and and full throttle on first tug should see it hit once with a puff of smoke. Second start attempt should be in choke position two (half choke) and with full pressure on the throttle. Should rev to life on start attempt. Let the engine IDLE for 30 seconds, moving the choke to off at the end of the waiting period. Let engine idle to warm another full minute with no choke, then set to work!

Hi,
Could be a number of things....
The ignitor is bad and it will not keep pulling enough current to hold the gas vavle on.
The dryer cycling thermostat is bad and is cycling it too often...ie, shutting the gas valve down too soon before it can run long enough and then turning it right back on.
The vent is blocked or plugged and the air gets too hot to fast.
The high limit switch has gone bad doing the same thing as if the cycling stat goes bad.
Fan/blower is bad and bot moving enough air...same symptoms as blocked vent...
Need to start eliminating the possiblities one by one...

http://www.fixya.com/support/r3907570-buy_appliance_parts_online

Heatman101

Generally with two cycle engine as soon as the engine starts the choke needs to be moved to the off or open position. Some chokes have a middle position that lets the motor run until it is warm enough to move the choke into the open position. In other words weather it is a two or four cycle engine the choke is used only to start the engine. If you unit is newer and still does not run well with the choke in the open position, you may need to adjust the hi-speed circuit to a richer one.

about 10 seconds

could be the coil