And that's what makes it unpractical for the most part. Unless you're running a Honda 90 or similar Lifan 4-stroke.You didn't say what engine you have, but it will will need to have an oil pressure system to effectively run an oil cooler.
Or you could add one of these.....you could add cooling fins to your oil pan.
you could make little brackets and bolt a couple of CPU fans to the side of your cylinder, wire em up to the motor, or your lights.
This;I suppose another question would be: does the engine have an oil pump? I don't know how well the oil cooler will work unless there is something to pump the oil through it