Vortex CK6363 Racing Sprocket Kit HFRS - Hyper Fast Steel 520 Kit, 1 Down in the Front, 2 Up Steel Rear Fits Yamaha FZS1000 / FZ1 06-09 Kit Gearing, Ratio 2.94, Front 16 Rear 47 OE Gearing, Ratio 2.65, Front 17 Rear 45 Kit Components, Front 3289-16, Rear 435S-47, Chain 520RV3-122