91503-ZY9-M00 Collar - Overview. The 91503-ZY9-M00 Collar is a vital component in Honda marine engine systems, specifically designed to support the module ignition control case (CDI). Its primary role is to secure and connect critical elements within the ignition system, ensuring efficient and reliable engine operation. Engineered to meet factory specifications, this collar ensures seamless integration with existing parts, maintaining optimal performance and durability.. Key Features. Genuine OE