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Dicking with air box and exhaust is not good, but Your problem is not likely caused by it here. Your bike will run lean (hot) if you made them less restrictive. But it will run and idle. If your bike is not returning to idle - you have sticking slide or throttle. Check is the throttle is returning to stop each time you twist it. Then (if still not returning to idle) take carb off and check if the slide move up and down freely. Very likely something is not assembled right causing slide to stick...Remember - vacuum moves it up - spring moves it down. Vacuum pulls harder than spring so it will open but if spring is not able to return it down - it will not return to idle normally.
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