2C4115 Push/Choke Key (2C) - Overview. The 2C4115 Push/Choke Key (2C) is a critical control component within Honda marine engine systems, specifically supports the ignition and engine operation system. This key functions to engage the choke during cold starts and then transitions smoothly to throttle control for acceleration. As a vital part of the engine's start and control system, it ensures seamless integration with existing parts, maintaining optimal performance and durability.. Key Features