Gas Powered Pressure Washer (Long Branch (Silver Spring))

I inherited this from previous homeowner. Started it just fine and seemed to be operating. However, it started smoking after about 30 minutes of running. I am not experienced enough with gas powered engines to know what needs to be done. Could be it just needs a new filter or oil and a good cleaning. Before I trash it, offering it to anyone with knowledge and confidence in tinkering with gas powered equipment.