When I bought my bike, the oil cooler was already removed due to a leak in the oil cooler line and the previous owner breaking off the screw into the oil cooler itself. He ended up throwing it out, installing block offs, and removing the restrictor behind the oil filter. I do have the restrictor that he removed as well as the mounting hardware for the oil cooler. I was planning on purchasing an oil cooler off of eBay and installing it. My main question is, is there a way to ensure that there is no foreign material inside the cooler? Any suggested ways of cleaning it out or testing that the oil flows properly? Thanks everyone in advance.