nitro engine wont start

by LUIS RIBOT
(PUERTO RICO)

I HAVE A USE .46 2 STROKE NITRO ENGINE .

AT FIRST THE ENGINE WAS STARTING UP OK BUT I NOTICE THAT IT WAS STUMBLING AT HALF THROTTLE.

I MOVE THE HIGH SPEED NEEDLE AND NOW I CANT GET THE ENGINE TO START UP . FOR THE RECORD THE CARBURETOR WAS OVER FLOODING .