Pump diaphragm may be bad and allowing fuel into crankcase. If your sure there is fuel in the oil, replace the pump and change oil. The pump is easy, a threaded hard line on top and two side bolts.
Confirm fuel IN carb, not just going to carb. Look down in as you pump gas and see if accel pump squirts fuel. Also see if plugs are wet. Check for sparks at a plug by grounding the threaded part and watch the end (and your fingers)
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