The SM 6133 Starter EGT (Epicyclic Gear Train) Gear Set is a high-precision internal component kit specifically engineered for the latest generation of Bosch-style (B. Type) reduction starter motors. This set of three planetary gears is optimized for the advanced BS6 emission-compliant engines used in the Piaggio Ape Auto series. Manufactured from reinforced, heat-treated alloy steel, these gears are designed to handle the high-torque demands and frequent start-stop cycles typical of modern urban cargo and passenger transport.