Mercury 50–275 HP & Honda 75–90 HP Outboard Impeller

This heavy-duty impeller is engineered for both high-power Mercury outboards and select Honda engines, offering OEM-equivalent performance across applications. It reliably circulates cooling water in Mercury 2-stroke engines from 50 HP up to 275 HP – covering many V4 and V6 models (including Optimax direct-injection outboards) – as well as MerCruiser Alpha One Gen II sterndrives (which use a similar pump design). In addition, it fits Honda 4-stroke outboards 75–90 HP, delivering the same dependable cooling for those mid-size engines.

With a 6-blade design and large 89 mm diameter, this impeller moves a high volume of water to keep bigger engines running at safe temperatures even under heavy load or high RPM. Constructed from durable neoprene rubber with a solid brass core, it withstands saltwater corrosion and prolonged use. This makes it ideal for speedboats, offshore fishing vessels, and other boats running high-output engines that demand reliable cooling. Installing this impeller ensures robust water flow and helps prevent costly engine overheating, even during hard operation.

• Broad Compatibility: Suitable for Mercury/Mariner V6 outboards (135–275 HP), V4 models (100–125 HP), and 3-cyl Optimax DFI engines (e.g. 90 HP) from the 1990s–2000s. Also an exact fit for MerCruiser Alpha One Gen II sterndrive water pumps (common on Mercury inboard engines 1992+).
• Honda Fitment: Matches Honda BF75 and BF90 4-stroke outboards (circa 1995–2007), restoring factory cooling performance for these engines as well. This dual compatibility makes it a convenient choice for multi-motor owners.
• High Performance Cooling: The impeller’s large diameter and 6-vane design ensure ample water flow for high-horsepower engines, keeping operating temperatures in check during high-speed runs or heavy loads. Ideal for boats ~5–8 m that frequently run at wide open throttle or carry significant weight.
• Durability: Marine-grade neoprene and a brass hub resist wear, deformation, and corrosion. Designed to meet or exceed OEM specs, it provides longevity and reliable performance in both freshwater and saltwater environments.
• Maintenance Recommendation: To protect your investment, replace this impeller at least once per boating season or every 100 hours. Regular replacement is key to preventing overheating in powerful outboards and sterndrives, especially when operated in demanding conditions.