99 250exc issues

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

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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