Reducing reciprocating weight is a proven strategy for high-RPM Mercury 2.0L, 2.4L and 2.5L V6 two-stroke outboards. The wrist pin connects the piston to the connecting rod and changes direction with every crankshaft revolution.
 
Reducing unnecessary pin mass can lower inertial loading on the piston, rod and wrist-pin bearing while maintaining the strength required for racing use.
 
Buckshot Racing #77 offers two Mercury V6 lightweight wrist-pin options: a short approximately 77-gram pin for compatible race and short-pin pistons, and a long approximately 82-gram pin for compatible Mercury 2.5L standard-length piston designs.
 
Each set includes six matched slip-fit wrist pins, enough for one Mercury V6 powerhead.
 
Option 1 – Short Lightweight Wrist Pins | Approximately 77 Grams
 
The Short 77g Lightweight Wrist Pin Set fits compatible Mercury 2.0L, 2.4L and 2.5L V6 pistons requiring the shorter wrist-pin configuration.
 
This style is commonly used with lightweight and racing pistons where the piston-pin boss dimensions differ from longer production-style 2.5L pistons. Applications can include performance-built 150, 175 and 200 HP Mercury V6 engines, 2.4L carbureted and EFI combinations, Bridgeport EFI, Laser EFI, XRi, and custom Mercury Racing engines.
 
For the 2.5L platform, short pins are also used with certain aftermarket race pistons installed in modified 260 EFI, 280 ROS, S3000 and 300 Drag-style powerheads.
 
At approximately 77 grams, these pins can provide a substantial reduction in reciprocating mass compared with heavier production wrist pins. The advantage becomes increasingly important as engine speed rises because piston and pin inertia increase rapidly with RPM.
 
They may be compatible with racing pistons from manufacturers including Wizard, Wiseco, WSM, Vertex, CRT, ProV and Buckshot Racing #77, but fitment must always be confirmed by actual dimensions. Verify wrist-pin diameter, overall length, piston-boss width and retaining-clip location before installation.
 
Option 2 – Long Lightweight Wrist Pins | Approximately 82 Grams
 
The Long 82g Lightweight Wrist Pin Set is designed primarily for compatible Mercury 2.5L V6 pistons requiring the longer production-style wrist pin.
 
Common applications can include 150 XR6, 175 HP, 200 EFI and 225 Pro Max engines, along with compatible Mercury Racing 260 EFI, 280 ROS, S3000 and 300 Drag combinations that retain a piston requiring the longer pin geometry.
 
Because many Mercury 2.5L engines have been rebuilt with different aftermarket pistons, the engine model alone does not determine the correct pin. A 260 EFI or 280 ROS may contain an OEM-style piston, Wiseco, Wizard or another racing piston with different wrist-pin dimensions.
 
At approximately 82 grams, the long lightweight pin retains the required geometry while reducing reciprocating weight. This can reduce inertial loading during piston reversal and is especially useful in high-RPM drag, tunnel-boat and offshore applications.
 
Why Lightweight Wrist Pins Matter
 
At elevated RPM, the piston, wrist pin and connecting-rod small end accelerate and reverse direction thousands of times per minute. A lighter wrist pin does not directly create horsepower, but reducing reciprocating mass decreases the load the rotating assembly must repeatedly accelerate and decelerate.
 
This can reduce dynamic loading on the piston bosses, small-end bearing, connecting rod and crankshaft assembly while improving engine response during rapid acceleration.
 
Weight alone should never determine wrist-pin selection. The correct pin must have the proper diameter, length, wall thickness, material strength and surface finish for the piston and engine. Never substitute a short pin for a long-pin piston—or the reverse.
 
Buckshot Racing #77 Installation Tech Tip
 
Before assembly, compare the new pin with the piston specification and original wrist pin. Confirm overall length, diameter, clip engagement and free movement through the piston bosses without excessive clearance or binding.
 
Inspect the wrist-pin bearing and connecting-rod small end for wear, discoloration or pitting. Lubricate the pin and bearing during assembly and verify that every retaining clip is fully seated.
 
Some lightweight racing wrist pins use a capped or directional design. If your pins are directional, follow the supplied installation instructions for correct orientation.
 
The Buckshot Racing #77 Mercury V6 Lightweight Wrist Pin Kit includes six matched slip-fit pins for one V6 powerhead.
 
Choose Option 1 – Short 77g Wrist Pins for compatible short-pin 2.0L, 2.4L and 2.5L race pistons, or Option 2 – Long 82g Wrist Pins for compatible long-pin Mercury 2.5L piston configurations.
 
Contact Mike Hill at +1-714-697-1716 or email mike@buckshotracing77.com for technical support.