Posting the model number of the engine may help.

Walt Conner

Did you check for spark AT the plug and did you check for compression on that cylinder?

At any rate, you're probably contaminating your oil with gasoline.

i do have spark at both plugs the only thing i have to do is change the oil its very old. if there is a gas smell with the oil what do i do then? after i chage the oil and there is fresh where do i go from there

May be pull the offending valve cover and have a look?

By all means, and $4 to $5, buy a fuel shut-off valve and install it in the fuel line. Then have the carb rebuilt.