if it only smokes alot on start up thats fine, how does it smoke after you been riding. did you rock quad before you started it to mix up fuel, it could have just been a lean start up if gas was not mixed well.

If you are using the right oil and fuel it does not need shaking before you ride.  If you need to shake it before you ride it will be impossible to keep you bike jetted as the day goes on.  If you need to shake it before you ride  your lubrication will also be inconsistent as you ride.

Most two strokes smoke less after they are warmed up because more of the oil burns when the engine is hot.  Remember oil is also a fuel but it takes more heat to ignite it. 

Too many guys over compensate when trying to jet their carbs for different fuel/oil ratios.  A 20:1 fuel/oil ratio is 5 % oil.  This means that if the oil in the premix DID NOT BURN you would need to richen your main jet 5% going from straight gasoline to a 20:1 premix ratio.  1 main jet size is about 3%.

To summarize:  Changing from a 40:1 ratio to a 20:1 ratio is 2.5% or about 1 main jet if none of the oil burned.  The majority of the oil DOES burn when the engine is up to temp and you are riding it hard so there is little change that needs to be made to the main jet when you are changing oil ratios.