520 Motorcycle Front Sprocket Pinion For Kawasaki KSF450 KFX450R ZX-6R Ninja ZX636 ZX600 2007-2025 Fit For KSF450 KFX450R 08-14 ZX-6R Ninja ZX6R ZX636 ZX600 2007-2025 vehicles; drive shaft spline; adapts standard 520 drive chain Direct bolt on mounting design; aligns shaft tooth position; no extra for chain assembly Polished smooth tooth surface; cuts down chain friction loss; delivers steady power output during acceleration hardness build; bears frequent speed rotation; slows surface abrasion over long rides Standard inner spline tooth dimension; size matching; keeps tight connection with drive shaft