RK Upgrade Kit Yamaha WR125 R X Y,Z,A,B,D,E,F (22B1 3) (22B2 4) 09 16 Oil Filters new Multiple Block Distribution technology 600308BLK 44 new Multiple Block Distribution technology increases the number of knobs on the shoulders and center of the tyres CoreFlex split rear folding thoracic strut is designed to work with the body’s natural movements for a more comfortable fit and break away before applying excessive pressure to the back RK chains recommended OE upgrade chain and sprocket kit Contains: Sprocket Rear RK B3098 53 JTR839 Afam 12207 RK Chain and Sprocket Kit Box RK 428HSB 134 Heavy Duty Chain JT Front Sprocket JTF1550 All sealed ring drive chains and chain and sprocket chain and sprocket kits carry a guaranteed mileage warranty when fitted with the new sprockets supplied