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2001 yz 125 transmission problem please help

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today i was ridding and i blew 1 first gear but only first gear. i no nolonger have a first gear. I also have my old motor out of my 2004 yz 125 that doesn't have a bottom end but it just has a perfect tranny  but the difference between 01 and 04 is that 01's have a 6 speed transmission and 04 is a 5 speed. I'm am wondering if i could take the first gear out of the 04 motor and put it in my 01 motor. would that work? is the 01's first gear shorter then the 04's first gear. And if i am able to put it in the 01 would it damage anything?


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