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99 250exc issues

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i just bought a 99 ktm250 exc and i rode the bi9ke a little noticing it smoked more than any other bike i ever had and it didnt seem like a big deal to me. but now i changed the transmission fluid witch was low and now its smoking like crazy. my guess is there is a bad seal in between the motor halves but am not sure just looking for a little input before i tear into the project. thanks

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Right crank seal is done. You could have possible main bearing issues as well. Take the ignition cover off and see if there is any play in the crank.

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