312085 Cutoff Switch Kt Sl3 - Overview. The 312085 Cutoff Switch Kt Sl3 is a vital kill switch kit designed specifically for Honda marine engine systems. It supports the engine ignition system by providing an immediate engine stop function, enhancing safety by disconnecting the ignition circuit when triggered. This part ensures seamless integration with existing parts, maintaining optimal performance and durability.. Key Features. Provides rapid engine shutdown to prevent accidents and damage..