Benefits: Bi-Directional (Inboard or Outboard) Load-free starting Excellent quality at a competitive price Easy to install Longer life than competitive clutchesAdvantages: Integral key design Sintered metal clutch shoes Heat dispersing spring-to-shoe designThe Extreme-Duty Sprocket Centrifugal Clutch is ideal for the everyday demands of childrens yard-use go-karts. This clutch was designed to be a low-cost upgrade to the stock unit. A thermodynamically designed clutch shoe increases the clutch’s capacity to absorb heat without damaging the clutch springs, resulting in longer life and better reliability.There are many variables that play into the performance of a clutch. Tire size, rear sprocket size and rear drive set-up are a few of the main variables that could affect clutch performance. If you are using large tires or a small sprocket, your vehicle may require a belt drive system. Clutch performance is not based soley on the engine size.