When you’re working on a Mercury Racing side-injected V6, injector retention hardware is a small detail that protects big horsepower.
Our 18-piece Fuel Injector Hold Down Stud Kit from Buckshot Racing #77 is built for the Mercury Racing side-injected 2.0, 2.4, and 2.5 Liters high-performance outboards, giving builders a clean, matched hardware refresh for reliable clamp load and easier long-term service.
This is the right solution for anyone searching for Mercury Racing injector hold-down studs, side-injected EFI injector hardware, or a complete fuel injector hold-down stud kit for classic performance Mercury V6 platforms.
Fits Mercury Racing Side-Injected Horn Motors
The Buckshot Racing #77 kit supports the legendary side-injected family that includes the 2.0 Liter F1 Champ, 2.4 Bridgeport, 260 EFI, 280 ROS, 300 Drag, and S3000. These engines operate in high-RPM, high-vibration conditions where aged studs, fatigued washers, or corroded nuts can create inconsistent injector hold-down tension and complicate tuning stability.
Replaces Critical Mercury OEM Hardware (Including an NLA Stud)
This kit is designed as a direct replacement package for the factory-style stack. The stud replaces Mercury OEM Part #21184, the stainless Mil Spec washer replaces Mercury OEM Part #29245, and the nut replaces Mercury OEM Part #35045. Just as important for availability planning, the Mercury OEM 21184 hold-down stud is listed as NLA, which makes a complete aftermarket solution especially valuable during a rebuild or refresh.
Installation Notes
Injector hold-down hardware works best when it’s installed with proper sealing components and correct torque practices.
It’s also smart to renew the injector sealing components while you’re there. The fuel injector seal 94219 and hold-down grommet 99123 are also shown as NLA in parts listings for these assemblies, reinforcing why builders often replace upper and lower sealing pieces during service.
The Buckshot Racing #77 upper and lower injector grommet seal kite helps prevent air leaks that can cause poor performance or lean conditions in these high-output outboards, especially on platforms like the 2.4 Bridgeport, 260 EFI, 280 ROS, 300 Drag, F1 Champ, and S3000. Bu
The Buckshot Racing #77 18-piece Fuel Injector Hold Down Stud Kit is a straightforward, performance-minded choice. With correct cross-reference coverage for Mercury OEM #21184, #29245, and #35045, plus a solution for the now NLA stud, it’s an excellent fit for maintaining safe, consistent injector retention on the most respected Mercury 2.0L, 2.4L, and 2.5L EFI race-bred outboards.
For technical support, contact Mike Hill at +1-714-697-1716 or mike@buckshotracing77.com