The Stainless Trim Pin Kit from Buckshot Racing #77 is a direct replacement for Mercury Marine and Mercury Racing trim pin assemblies, specifically OEM Part Numbers 841199 and 8220752.
It also replaces the Mercury Thin Lock Nuts (2x) O82671317 and Retainer Washers (2x) 822076, providing a complete stainless-steel hardware solution for improved longevity and precision alignment in high-performance outboards.
Where Mercury’s OEM components total over $361.09 — with the trim pin (8220752) at $280.75, washers (822076) at $36.57 each, and lock nuts (O82671317) at $3.60 each — the Buckshot Racing kit provides the entire assembly for $79.
The design eliminates corrosion-prone materials and weak retention methods found in the stock configuration while maintaining full OEM fitment.
Outboard Engine Compatibility
This kit fits a wide range of Long and Short Shaft Mercury and Mercury Racing 2-stroke, Carb, EFI, DFI, and Optimax outboards in the 2.0L, 2.4L, 2.5L, 3.0L, and 3.2L classes. Confirmed compatible engines include:
200 HP XS 6 CYL (2.5L)
225X EFI Promax
250 HP Sport XS (3.0L)
250 HP DFI and Opti XS (3.0L)
300 HP Optimax XS (3.2L)
300X (3.0L EFI) Pro Max
150/200 HP Pro Max / Super Magnum
245 Carb, 260 EFI, 280 ROS, 300 Drag 2.5L EFI Offshore
These Mercury outboard racing models are found on legacy and modern high-performance, offshore, and competition hulls. The kit maintains stock geometry and trim range while upgrading all fasteners to marine-grade stainless steel.
OEM Design Limitations
Mercury’s carbon steel trim pins are structurally sound but degrade rapidly in marine environments. Moisture, galvanic corrosion, and electrolysis between steel pins and aluminum brackets lead to pitting, binding, and seizure within trim ram eyelets. Once corrosion sets in, trim motion becomes inconsistent, and removal typically requires cutting or heat.
Older Mercury assemblies used a screw-and-pin retention system, which often failed as corrosion weakened the threads and vibration loosened the fastener. Over time, this caused pin migration and alignment loss, affecting trim symmetry and stability at speed.
Design Improvements
We address these deficiencies with a CNC-machined stainless pin assembly built for long-term service life. The stainless steel composition eliminates galvanic interaction with aluminum housings, preventing corrosion and surface galling.
Instead of threaded retention screws, the kit uses thin stainless lock nuts on each end, paired with extra-thick (.120") stainless washers.
This arrangement applies uniform compression, maintains alignment, and resists loosening under continuous vibration. The thicker washers distribute the load more evenly across the housing face, preventing surface distortion and ensuring consistent pin positioning through the trim cycle.
Each Trim Pin is dimensionally matched to correct tolerances, ensuring direct replacement compatibility with no modification required. The result is smoother trim motion, no seizure risk, and longer bushing and ram life.
Installation Procedure
Before installation, inspect and clean the trim ram and bracket bores to remove any oxide buildup. Apply a thick coat of anti-seize compound or Mercury 2-4-C marine grease to the pin and washer faces.
Insert the pin through both trim ram eyelets, fit the .120" washers, then thread and snug the lock nuts evenly. Tighten until the washers seat flush without excessive torque, which could restrict movement.
Cycle the trim system through the full range several times to verify smooth, even travel. Periodic inspection and grease will maintain optimal performance and prevent galling over extended use.
From an engineering standpoint, the Buckshot Racing Stainless Trim Pin Kit #77 provides a single-material corrosion-resistant assembly that maintains strength, alignment, and serviceability.
The stainless hardware eliminates the mixed-metal corrosion path inherent in the OEM system while improving retention integrity under load.
It is a drop-in upgrade suitable for race, performance, and or recreational Mercury outboards, ensuring long-term mechanical stability in both freshwater and saltwater environments.
Contact Mike Hill at mike@buckshotracing77.com with technical questions