i have a 87 lt 250r.when i gave it gas it would like stall,so i cleaned the Carburetor and i started it and it worken,but when i did a donut and it stalled and i couldnt get it started.what should i do?is it card problems?

 

sounds like a fuel/carb problem to me, check all your hoses and clamps that go on it and make sure the petcock isnt plugged
if all that is ok then pull the carb and clean it again