...without any light modifiers.

A friend of mine has been asking about shooting portraits of him with his dirtbike. As I rolled the idea around in my head this morning, I thought of one composition that would include the bike's exhaust plume. Then I realized that might be very difficult to capture, even with strobes and controlled lighting. We will probably be outdoors and without any light modifiers.

Does anyone have experience trying to capture such a subject? Can you offer me some pointers?