Diesel fuel will not hurt the engine like gas will to a diesel engine. Spark does not ignite diesel very well, in fact I'm surprised it run at all. Since you had to run it with choke on and the spark did not ignight most of the fuel there are only 2 places the unburned fuel has to go out the exhaust into the muffler or into the crankcase. I'll bet if you pull the dip stick and smell the oil it smells like diesel. Drain the oil and refil with fresh oil. The oil will be thinned out from being diluted with diesel so the engine will run hot. Once running it will probably smoke until all the diesel is blown and burned out of the exhaust.
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