Peugeot Speedfighter Wont Run !!?

Hi, i have a peugeot speedfighter and for some reason it wont run. it was running fine at first then i put some petrol in it wich had allready been mixed with 2 stroke wich i wasnt aware of. i went to start the bike in the morning and it wouldnt run. So i drained the petrol out of the tank , drained the petrol out of the carb, and put new stuff in, and for some reason it still wont run, help any one?