This 2-stroke stator magneto is designed for Apache 50cc and 100cc quad bikes. It is compatible with 2-stroke quad bikes, ATVs, and scooters, and is similar to parts used on many 100cc CPI4 models. Key Specifications: Diameter of Central Hole (Smallest): 22 mm / 0.87 inches Inner Diameter (thread): 28 mm / 1.1 inches Height: 28 mm / 1.1 inches Greatest Outer Diameter: [Value not provided] This part is suitable for various motor-related applications, including quad bikes, scooters, and ATVs, particularly those with 2-stroke engines.