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Running an '06 KX250F Straight Piped?

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So I have a RMZ 250 frame thats got a KX250F motor in it, and I just opened up the muffler to repack it for the first time in like 5 years.  So the idea of just sticking the muffler back together with the core in it without any packing came to mind.  I assume it will lose some power, but would riding the bike once for probably around two hours, have any chance at harming any part of the bike?  I figure someone here probably has more technical knowledge in the area than I do, and just wanted to ask anyone that might know if this would be something thats alright to do once just for shits and giggles, or if it'll blow the engine up or something.  Thanks.

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Besides sounding absolutely terrible, it effectively opens up the exhaust a bit and plays with the backpressure/pulse and will run lean.

Will it blow up? Eventually. 2 hours is probably right on the edge. You could turn the mixture screw out...but you should reeeeally pack it.

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