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50 cc 2 stroke lots of smoke after new top end

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So my friend just bought a ktm 50cc for his son to race.  The guy that sold it to him says he just did a top end and only used the bike about 30 minutes.  He also says that he mixes gas/oil at 40:1.    If you start the bike and rev it up it doesn't really smoke that bad, but when you let off the throttle lots a blue smoke comes out.  



1) Is this normal after a new top end?

2) Maybe it smokes a  lot because of the 40:1 mix, if we use 60:1 would it make that big of difference.

3) Could there be something wrong with the top end rebuild that needs to be addressed?


Thanks for your help guys. :ride:

Edited by big mike42

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