41131-ZY1-000 Pinion Gear - Overview. The 41131-ZY1-000 Pinion Gear is a vital component within Honda marine engine systems, specifically supporting the lower unit transmission system. This pinion gear plays a crucial role in transmitting mechanical power from the driveshaft to the propeller by meshing with the forward gear, enabling smooth and efficient forward motion. Designed to meet precise factory specifications, it ensures seamless integration with existing parts, maintaining optimal perfo