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What size is oil drain bolt

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I just bought a 1995 rm 250 and the transmission drain plug fell out of it and im not sure what size it is. Everything i saw said it was a M12x1.25 thread so i went and got a bolt that was that size and it slipped right in without even touching the threads so the next size up was a M14x1.25 and that was too big to even try to get started threading. So what size is it then?

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