You may just have water in the carb. Did you ride in the rain or wash it recently?
Try draining the carburetor real quick. The water in there will come out first since gas and water separate gas on top. There are two types of drains. One is a screw on the bottom of the float bowl and the other a screw on the end of a tube that's bolted to the engine just above the kick stand. Loosen the screw on both types to drain.


If draining the carb doesn't help, clean the carburetor and replace the fuel filter. When you are cleaning the carb, look at the diaphragm real close for any holes. Pay attention to how it all comes apart. Label the hoses or take a picture(s) before you remove it so you can get everything hooked back up right.
Diaphragm: (Yours will look a little different)

Carb blow up. Again your will look slightly different but they are pretty much the same:
