Yz 125 Power valve

Hey guys quick question here... I am rebuilding a 99 yz 125. The cylinder power valve are completely removed. I have a 01 cylinder with a bad bore.... I have noticed that the power valve will not interchange 99 and 01 cylinder. I ve notice on one cylinder Y-1 and Y-2 .... Will either y-1 or y-2 cylinder interchange

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