The Mercury Racing 5-Petal SportJet Reed Cage Assembly 840805T1 is a genuine Mercury Racing OEM induction component designed specifically for Mercury's highest-performance 2.5L V6 two-stroke engines, including the 240 SportJet,  280 ROS, 300 Drag, and S3000 outboards.
 
Engineered for maximum airflow and precise reed control, the Mercury Racing OEM 5-Petal, Rubber-Coated, Reed Cage Assembly 840805 delivers the reliability and performance required by factory race engines operating at sustained high engine speeds.
 
It is the same factory reed cage used on several of Mercury Racing's legendary competition engines, making it the preferred choice for engine rebuilders seeking authentic OEM performance.
 
Engineered for High-RPM Airflow
 
The reed cage assembly is one of the most critical components in any high-performance two-stroke induction system. Every revolution of the crankshaft depends on the reed valves opening and closing rapidly to regulate the air and fuel mixture entering the crankcase.
 
At racing engine speeds exceeding 7,000-10,000 RPMs, the reed petals cycle hundreds of times every second, making reed cage alignment and sealing essential for maintaining horsepower and throttle response.
 
The Mercury Racing Sport Jet Reed Cage Assembly is engineered to provide smooth, unrestricted airflow while maintaining excellent reed stability. Proper reed alignment helps maximize crankcase filling, producing crisp throttle response, rapid acceleration, and consistent power throughout the engine's operating range.
 
Genuine Mercury Racing OEM Quality
 
Because this is a Mercury Racing Genuine OEM component, every 840805T1 Rubber Coated Reed Cage Assembly is manufactured using Mercury Racing's original tooling, materials, and dimensional specifications. This ensures proper reed seating, accurate mounting surfaces, and consistent airflow from cylinder to cylinder.
 
Whether restoring a factory Mercury Racing engine or replacing a damaged reed cage, using the original Mercury Racing OEM 840805T1 eliminates the fitment concerns that can sometimes accompany aftermarket components.
 
Fits Legendary Mercury Racing Engines
 
The Mercury Racing Reed Cage Assembly 840805T1 is used on several of Mercury Racing's most recognizable competition engines, including the Mercury Racing 240 SportJet, 280 ROS (Race Offshore), 300 Drag, and S3000 racing outboards.
 
These engines are renowned for their exceptional power output, lightweight 2.5L V6 architecture, and ability to operate reliably at extremely high RPM in drag racing, Formula One tunnel boats, SportJet applications, and offshore competition.
 
Because these engines rely on precise induction tuning, maintaining the factory reed cage geometry is essential for preserving the airflow characteristics Mercury Racing engineers originally designed into the engine.
 
Restore Factory Performance
 
Over years of service, reed cages can become damaged from broken reed petals, improper assembly, corrosion, or accidental impact during engine rebuilding. Replacing worn or damaged reed cages with a Genuine Mercury Racing 840805T1 Reed Cage Assembly restores the original intake alignment and provides the proper foundation for new reed petals.
 
For maximum performance, Mercury Racing reed cages are commonly paired with high-quality composite reed petals during engine rebuilding, allowing the induction system to deliver reliable airflow while maintaining factory geometry.
 
Buckshot Racing #77 Tech Tip
 
Whenever servicing the induction system, carefully inspect the reed cage for chipped sealing surfaces, loose reed stop screws, damaged mounting threads, and warped reed lands.
 
Even minor imperfections can affect reed sealing and crankcase pressure. During installation, always use new intake gaskets where required and torque all fasteners according to Mercury Racing service specifications to ensure proper sealing and long-term reliability.
 
Final Thoughts
 
The Mercury Racing Reed Cage Assembly 840805T1 remains the factory-standard induction component for several of Mercury Racing's most iconic 2.5L V6 performance engines.
 
Whether rebuilding a 240 SportJet, 280 ROS, 300 Drag, or S3000, choosing the Genuine Mercury Racing OEM 840805T1 Reed Cage Assembly ensures authentic factory fit, proper airflow characteristics, and the durability expected from Mercury Racing's original engineering.
 
Contact Mike Hill with technical questions at 714-697-1716