91311-881-003 O-Ring (62X2.5) - Overview. The 91311-881-003 O-Ring (62X2.5) is a crucial sealing component designed for Honda marine engine systems. This O-ring is used primarily in sealing applications within the starter case, cam pulley, and points of Honda marine engines. Its role is critical in maintaining system integrity by preventing water ingress and ensuring pressure retention, thus supporting optimal engine operation. Manufactured to exact factory specifications, this O-ring ensures se