17931-ZV0-000 Throttle Lever - Overview. The 17931-ZV0-000 Throttle Lever is a critical component in Honda marine engine systems. This lever is part of the throttle control system, which regulates engine speed to optimize performance. By precisely adjusting the throttle, it allows boaters to manually control engine power output for smooth acceleration and deceleration. Designed explicitly for compatibility with Honda engines, this OEM part ensures seamless integration with existing parts, mainta