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excess 2 stroke smoking

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hey guys, 

i have a 1998 ktm 250 exc, with a fresh top end on it that smokes a lot more then normal  

ive heard that it could be jetting issues but however ive already jetted the bike back to oem specs and even leaned it out to 50:1 

what could the issue be?

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Bad crank seal allowing gear oil to be sucked in and burned would be my only guess.

Edited by Doc_d
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Yeah I think that could be it cause my gear box oil was full before I went riding and afterwards it was a lot less 

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 OEM specs on older ktms are typically horrible. Besides it's a starting point for any brand. Adjust as needed.  

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