The impeller is the water pump component that ensures the necessary cooling for the Yamaha outboard motor. During annual servicing, it should be inspected and replaced if worn out, to protect the engine from overheating and potential damage.

For a 2hp Yamaha outboard, this particular impeller measures 11.15 x 47.5 x 13.7 mm (inner diameter 11.15 mm, outer diameter 47.5 mm, and height 13.7 mm).