So, what happened immediately before this problem? Did you hit something?

Geezzz. How about some more clues???? what type of LT, engine, does it have fuel pump or not. where did you get the carb.? new or used. Usually if it fires off carb. cleaner and dies you ARE NOT GETTING FUEL THROUGH THE CARB. or up to the carb. Fill us in on some of the Clues so we can atleast reasonable guess on your problem.

Could be fuel starvation. I am assuming you used a new carb and not used. Check the fuel tank for built up rust and inside. Also check for a sheared flywheel key.

Could be fuel starvation. I am assuming you used a new carb and not used. Check the fuel tank for built up rust and inside. Also check for a sheared flywheel key.

If it is a standard lawnmower with a float bowl carb, you may also want to check for a clogged and/or gummed up carburetor brass bowl bolt (jet). Check it closely for clogged orifices near the middle and the bottom.