I HAVE A 92 250X THAT I CANT SEEM TO FIX. i HAVE TAKEN APART AND CLEANED THE CARB TWICE. AND IT STILL WONT RUN RIGHT. THE PROBLEM IS WHEN I GO UP A STEAP HILL OR DO A WHEELIE, AS SOON AS I GET LEVEL AGAIN IT ACTS AS IF ITS RUNNING OUT OF GAS.
IT WILL IDLE JUST FINE BUT AS SOON AS I GIVE IT A LITTLE THROTTLE IT SPITS AND CHOKES AND SOMETIMES BACK FIRES. WHAT DO i NEED TO LOOK FOR OR DO?
I WOULD REALLY APPRECIATE YOUR HELP.

 

It sounds to me like the valves need to be adjusted. how is 5th gear on flat surfaces? Let me know more info on what is happening

 

sounds like a carb. maybe float valve problem.
call ur local shop.