Up for sale is JT 1972 CT2 Yamaha REAR SPROCKET STEEL 42T-428 YAM JTR1842.42. The vendor part number is JTR1842.42. 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 or three times over .