[LifeLiberty]

is it oil or gas?

if oil, bad rings
if gas, then you are running rich, could be an airbox restriction
if water, then could be coolant, check you oil for coolant in the oil.

you should list your bike so we know what you are talking about

 

[LifeLiberty]

jim, you're right, no/weak spark=wet gassy plugs, that slipped my mind

 

[LifeLiberty]

airbox restriction, dirty airfilter, bandana stuck in airbox, etc., anything that restricts airflow to carbs

do what jim says, check to see if your plugs are firing, might have a bad coil

did you recently wreck the bike?