Up for sale is JT 2009-2015 YFZ450R Yamaha FRONT CS SPROCKET STEEL 14T-520 YAM JTF1592.14. The vendor part number is JTF1592.14. Please read the title to know what is for sale. Catalog Description� TOP QUALITY AT ECONOMICAL PRICES Made exclusively from the finest Japanese 545C high carbon steel Heat treated and hand finished to meet or exceed O.E.M. standards Outlasts any mild steel or surface hardened sprocket as much as two and three times over .