87581-921-600 Point Mark - Overview. The 87581-921-600 Point Mark is a critical component in Honda marine engine systems. It functions within the starter case, cam pulley, and points assembly, playing a vital role in the ignition system to ensure reliable engine start-up and operation. This genuine Honda part is designed to meet strict factory specifications, ensuring seamless integration with existing parts and maintaining optimal performance and durability in your marine engine.. Key Features.