31217-ZVT-B11 Rotor - Overview. The 31217-ZVT-B11 Rotor is an essential component within Honda marine engine systems responsible for generating the ignition spark needed to combust fuel and power the engine. Designed specifically for Honda outboard motors, this rotor plays a pivotal role in maintaining reliable engine ignition and overall performance. Crafted to Honda's factory specifications, this rotor ensures seamless integration with existing parts, maintaining optimal performance and durabi