87121-ZV9-800 Mark Rr. (20) - Overview. The 87121-ZV9-800 Mark Rr. (20) is a genuine OEM decal designed for Honda marine engine systems. This rear engine power rating mark is an essential visual component that supports proper engine identification and compliance with manufacturer specifications. Ideally suited for Honda Active Marine engines, this mark ensures seamless integration with existing parts, maintaining optimal performance and durability.. Key Features. Genuine OEM Honda part ensuring accurate fitment and quality.. Serves as a rear (RR) mark indicating the 20 horsepower rating of the engine.. Made to meet factory specifications, dimensions, and tolerances for Honda marine engines.. Used primarily for engine identification and labeling on applicable Honda marine engine models.. Durable and designed to withstand the marine environment.. Maintains the professional look and brand consistency of Honda marine engines.. Why Choose Genuine OEM. Using original Honda parts like the 871