Don't run it till you address the problem AND change the oil!!!!!
If you messed with the carb. either you have crud under the needle valve or did something wrong.
Start at the carb first, many times removing/installing the fuel line induces crud under the needle valve.
Also it will smoke like hell after you repair it and start it as the fuel is burning out of the muffler.
Running it without changing the oil, will do damage to the engine
