Yamaha MWS125 2021 125 Tricity. Yamaha MWS125 2022 125 Tricity. Yamaha MWS125 2023 125 Tricity. Yamaha MWS125 2024 125 Tricity. The Oil Pump Gear Assy is the gear-driven assembly that transfers rotational power from the engine to the oil pump, ensuring continuous circulation of lubricating oil under pressure to all critical engine components.