Exmark THP17KA483 Used 48" Turf Tracer HP Walk-Behind Mower 17HP Kawasaki. With the Exmark Turf Tracer, you can choose from a variety of rugged engines. Exmark wide-area walk-behind mowers are an investment in the long run. From the fixed-deck, gear-drive Metro to the industry-leading Turf Tracer, Exmark walk-behinds are engineered for speed, efficiency, durability and a quality of cut that are second to none.