Impeller for Yamaha 2 HP (Fits Mariner 2 HP) – Replacement Water Pump Blade

The impeller marked 52.400.10 is intended for the smallest Yamaha two-stroke outboards of 2 HP (as well as their Mariner 2 HP counterparts). It replaces the original water pump rotor (Yamaha OEM 646-44352-01) and restores the circulation of cooling water through the engine. Even though they are small, these motors require effective cooling, especially when running at full throttle to push a boat.
With its durable rubber construction, this impeller is engineered to withstand the vibrations and stresses characteristic of 2 HP engines. Its 6 flexible blades ensure a continuous stream of water flows through the engine’s cooling passages. Installation is straightforward – just follow the standard impeller replacement procedure, with no modifications needed.
For owners of Yamaha/Mariner 2 HP engines, having a functional impeller is crucial to avoid overheating in warm weather or during extended operation. It is advisable to inspect the impeller regularly and replace it at the first signs of wear. With a small investment in a spare impeller, you ensure peace of mind and longevity for your tiny engine.

• Application: Meant for small inflatables, canoes, or auxiliary engines on sailing vessels powered by Yamaha/Mariner 2 HP motors. The impeller keeps the engine cool when carrying light loads or maneuvering over short distances.
• Recommendation: Suitable for boats up to ~2 meters in length equipped with a 2 HP outboard. It is recommended to replace the impeller at least once a year (or around every 50 hours of operation) to keep the engine running at optimal temperature at all times.