Description The Spears Racing Slipper Clutch for the Kawasaki Ninja 400/Ninja 500/ZX400rr (5 plates) is a high-performance upgrade designed for racing, track, and street riding. Here’s a concise breakdown of its key features, benefits, and components based on the provided information: Key Features: Material: CNC-machined from EN AW 7075 aerospace aluminum alloy, offering high strength, ductility, toughness, and fatigue resistance. Finish: Hard anodized (Type III) for a harder, denser, and more abrasion-resistant coating, enhancing durability and longevity. Design: Computer-aided design/manufacturing (CAD/CAM) billet slipper clutch, tested and raced globally in WorldSSP300, WorldSBK, BSB, and MotoAmerica. Compatibility: Uses original friction plates, drive plates, and basket (some kits include a billet basket replacement). Benefits of the Slipper Clutch: Reduced Rear Wheel Chatter: Minimizes wheel hop during downshifting, improving chassis stability under braking and corner entry. Enhanced Cornering: Allows higher corner entry/mid-corner speeds by reducing engine braking, leading to faster lap times and better grip. Engine and Transmission Protection: Reduces mechanical stress from engine back-torque, preventing damage to the engine and gearbox, and minimizes over-revving on downshifts. Improved Rider Confidence: Smoother clutch feel and action reduce the need to focus on clutch operation, allowing riders to concentrate on braking, body posture, and cornering. Reduced Wear: Lowers stress on the transmission and chain, extending their lifespan. Safety: Prevents rear wheel lock-up in case of engine seizure or transmission failure. Versatility: Suitable for racing, track, and street applications. Spears-Racing-Kawasaki-Ninja-400/500/zx400rr-Slipper-Install Kit Components: 1 Spears Racing Slipper Drum 1 Pressure Plate 5 Spring Tops (standard set) 5 Spring Tops (for increased preload/more engine back-torque) 5 M5 Bolts 5 SP20-400 Slipper Clutch Springs 1 Red Loctite 1 Throw Out Bearing (for 2020 models only) Why It’s Needed: The slipper clutch mitigates the destabilizing effects of aggressive downshifting by reducing back-torque, which can cause rear wheel chatter or lock-up. This leads to better control, stability, and confidence, particularly in high-performance riding scenarios. It also protects critical components, making it a valuable upgrade for competitive riders and enthusiasts. Clutch Cover Gasket
