I had an interesting experience this afternoon when I had a bloke bring back his Powertorque because it wouldn't start. After checking it had spark I pulled the fuel hose off to make sure fuel was flowing, there was nothing and after about a second I had oil come out slowly and then the fuel flowed. I pulled the primer cap off and the float bowl had oil in it. Once I had this cleaned out I got it running, no problems. The owner was adamant he had not put the oil in the tank and added the petrol. He had told me when it did stop he had added fuel but it wouldn't start again. This is why the oil went down the fuel line and into the carby and wasn't mixed. Much easier to work things out if people told the truth.