The Buckshot Racing #77 Water Pump Housing is a direct replacement for Mercury Racing 2.5-liter 2-stroke outboards utilizing the Race Offshore (ROS) large tube configuration. While often referred to as a "¾-inch" tube, the actual outer diameter measures 0.810 inches, making it a custom-sized component unique to high-performance applications.
 
This housing is fully compatible with CLE, Sport Master, and Torque Master lower units, commonly found on late-model Mercury Racing engines such as the 225 Pro Max, 245 HP, 260 ROS, 280 HP, and 300 Drag, specifically those equipped with the later-style one-piece exhaust tuner plate.
 
Engineered as a direct replacement for Mercury OEM part numbers 847710A1 and 847710T1, the Buckshot Racing #77 housing provides equivalent dimensional fitment while upgrading the material construction. The housing features a carbon fiber adapter, offering improved rigidity, heat resistance, and structural integrity over the standard injection-molded thermoplastics found in factory units.
 
The complete kit includes a carbon fiber water pump housing, oversized grommet, impeller, driveshaft key, water slinger, stainless steel mounting screw, wear plate, and a comprehensive set of OEM-grade gaskets and seals. This ensures a reliable seal and consistent cooling system performance under sustained high-RPM conditions, which are typical in offshore and racing applications.
 
In contrast, OEM and Quicksilver kits under part numbers 847710A1 and 847710T1 typically exclude the impeller, wear plate, and gaskets, and use a plastic housing rather than a carbon fiber adapter. For this reason, the Buckshot Racing #77 kit is commonly selected when durability, thermal stability, and full system replacement are priorities.
 
Optional performance-enhancing components—including a large-diameter carbon fiber guide tube and a titanium water tube—are also available from Buckshot Racing and are designed to integrate with this housing in demanding marine environments.
 
This system is ideal for high-output Mercury Racing 2.5L engines where water delivery, thermal efficiency, and mechanical reliability are critical, particularly in modified, competition, or offshore powerboat applications.
 
For technical inquiries, contact Mike Hill at 714-697-1716 or via email at mike@buckshotracing77.com.