wr400 suddenly shuts off...

hello everyone, i have a quick question. At low rpm or while at idle the bike suddenly shuts off on occasions.(bikes really warmed up) Is it because its over heating or because of poor jetting. Ive done the yz timing, airbox, throttle stopper, and exhaust insert. The packing or insulation between the muffler and header pipe is gone though as well so im wondering if it needs to be jetted and if so am i damaging the valves or something by running it this way. thanks for your help-ed

Play with the air screw, small change can make a big difference when idling or small throttle opening.

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