Finding repair locations for Briggs & Stratton...

Question

Location: Vancouver, British Columbia, CanadaGasolinr and oil were added to the machine by an alledged knowledgable individual. As soon as it was started, black smoke was emited from the engine area. Possible wrong oil used. I am not able to initiate repairs myself so am looking for a reputable repair shop that knows this type of machine.Thanks for any help.