Smoking after oil change

So I just changed the oil in my 520sx that I just got. Using a thicker oil because that's what the bike has had through it from previous owner, now the bike is smoking and I'm not sure why?

Overfilled ?

does it smoke heavily through the exhaust pipe or breather hose? 


Does it stop after running a while or is it continuous.


If the smoking stops after startup and runnin for a while its your valve seals, if its smoking all the time and you have oil comin out of the breather hose then you have a bad piston ring. 



After an oil change, the bike will smoke some but should clear up soon.  As to oil, you can't beat the Castrol Edge 5-50.  You can get this on sale for around $6.

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