13322-Raa-A02 Main (Upper) Brg B - Overview. The 13322-Raa-A02 Main (Upper) Brg B is a vital component in Honda marine engine systems. This upper main bearing plays a critical role in supporting the crankshaft's rotation by reducing friction and wear, ensuring smooth and reliable operation of the engine. Designed to exact factory specifications, it guarantees seamless integration with existing parts, maintaining optimal performance and durability within the marine engine assembly.. Key Features.