What's the ratio for the oil. Some oils run rich or lean depending on the product. But you should at least get it started.
Remove the plug wire and try to start the motor and check to see if you have spark in the cable. Cable or spark plug could be bad.
Check to see if your carb. Fuel may not be supplied to the jet.
Or maybe you have an air leak, check the placement of the carb. Make sure it's all the way in.
I have had these problems and going through step by step help eliminate them.