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Loss of power on 2stroke

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how do you lose power on 2 stroke dirt bike? I just got my bike back I was breaking the engine in or still I'm not sure if it is yet but now I can't hit power band it got poor throttle response now . It was ok yesterday when it had less hours in it but now it's not running right . Top and bottom and rebuild cleaned air filter put new plug in it also doing rebuild but that one foul out so I put new one in.its seems like it's about to foul could that be why 02 rm 125

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Doing or after break in does the bike suppose to lose power ? Also what happens if u break it in the wrong way

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If it's fouling plugs, you need to re-jet the carb.  The bike should not loose power when it's breaking in unless something was done wrong.   Check the FAQ at the top of the forum and check the jetting post. It will help a lot.  Be sure you're mixing the oil and gas at the right ratio also.

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