The SM 6135 is a heavy-duty internal component specifically designed for the high-capacity Bosch-style (B. Type) reduction starter motors found in the latest Piaggio Ape Type 6 models. This EGT (Epicyclic Gear Train) plastic cap is uniquely engineered with an enlarged internal diameter to accommodate the "Big Gear" planetary assembly used in high-torque diesel variants. It serves as both a protective housing and a structural alignment guide, ensuring the larger gear set remains perfectly synchronized during the intense cranking cycles of BS6 Phase II commercial engines.
