sputters

sputters at mid rpms. low rpms are fine takes off no problem but when i hold it to mid rpm not WOT it will sputter. i can smell gas real bad when i let off and am at a stand still. i have a free flow exhaust on it. i checked for vent lock in the tank by loosening the cap but it doesnt help. i...

Hi guys i need help. Today my minibike started sputtering badly( thought i was low on gas) so i stopped and looked at the engine and oil was everywhere around the carb. Any ideas ?? Ive been having lots of problems with my engine lately