I have a LTz400 suzuki quad sport and i keep getting gas in the oil, and i dont know what is wrong.  

hi I have a suzuki vinson and z400 any way you are flooding it . I recently flooded my vinson and it would not start ask dealer about it and said change oil gas in it I had tried everything else worked out fine  

Hinkles is right, flooding can cause this to happen.
this can also happen if you are rolling the atv over.


the worst case scenario is that you have a broken or cracked cylinder sleeve or piston skirt.
though normally when the piston skirt is broken it doesn't like to turn over very well.