There should be no gas smell in the oil which indicates fuel is entering the oil. Pull the carb, remove the float bowl, invert carb so as float is facing up. Connect a fuel line to the fuel inlet and blow into line. If you can not blow into line the needle and seat is fine but if you can blow the least bit the needle and seat are leaking. If leaking pull float as well as needle and inspect tip as well as seat for any trash that can cause it to leak. Also with carb inverted make sure the float seal is parallel with the base of carb.
How did the buggy run when driven, was there any smoke out exhaust and if so what color.
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