He trimmers keep cutting off =(

[Orkin Yards]

my green machine hedge trimmers are having problems, and i haven't figured out what is wrong, here is what it does...trimming along and it sounds like i hit the on off switch while its at full throtle, a fairly immideate cut off, and then i can crank it back up as soon as it dies, i've rebuilt the carb earlier this season so its proabably not that, i checked it today to make sure i had it all put together correctly and tightly, i cleaned the fuel filter and made sure there weren't any holes in the fuel line, and i can't figure out why they keep cutting off, it doesn't seem as though it does it more inverted that normal but it is possible, i just haven't figured out when it does it and why for that matter...ANY help would be nice i have a job i'm trying to finish tommorow!

[Runner]

Is it possible you have a short somewhere along the line? Maybe in your switch or something? Also, if you plug wire perhaps has a splice somewhere, (it can even be below the cover where you can't see it) This could do it.

[MWHC]

Have you checked to see if the gas cap is venting properly?
Run it without the cap for a while and see if that solves anything.

[cut-rite]

Did you replace the spark plug? They can heat up and break down like that.

[cos]

Maybe its the magnito. It probably heats up the point where it won't give out a spark.

[Remsen1]

Won't running it without the cap splash gas all over the place?

You may have a stuck float valve.

[yorkpaddy]

most 2stroke engines don't have float valves normally a diaphram carb