Yamaha Motor Co., Ltd. BR9-12450-00-00 Impeller Shaft

The Yamaha BR9-12450-00-00 Impeller Shaft is a hardened steel, precision-fit shaft that drives the water pump impeller in Yamaha outboard engine cooling systems. This rotating shaft sits within the water pump housing or lower unit assembly and transfers rotational motion from the engine to the impeller to circulate water through the cooling circuit, helping regulate engine temperature. Commonly installed in Yamaha water pump and impeller drive assemblies, it plays a critical role in marine cooling for recreational boats, commercial operations, and industrial watercraft where reliable cooling flow is essential. The part is a genuine Yamaha component (Brand: Yamaha; OEM Status: Genuine Yamaha part) and is specified as Part Number BR9-12450-00-00, with material listed as hardened steel shaft (corrosion-resistant treated). It is used for shaft replacement, cooling system repair, or OEM restoration, and is compatible with Yamaha outboard engines (model-dependent fitment). Installation is a precision-fit shaft within the pump assembly to ensure proper engagement with the impeller. Common replacements include Yamaha BR9-12450-01-00, Yamaha 6E5-12450-00-00, and Yamaha 63V-12450-00-00.