Not the first motor to have petrol in the oil, I had a mower brought here recently that somebody had filled the sump with petrol, They had had it running but oil/petrol was spraying out of the muffler. I checked the oil and it was half way up the oil filler tube. Drained it out, put new oil in it and all was good. Now back to your problem, if you think the oil has petrol in it then drain it out and refill, then come back to us with any further info so we can try and help, like , does it have spark, when was it last run, does it have fresh fuel in it?, million reasons as to why it NO GO.