For anyone building, restoring, or maintaining Mercury Racing 2.5L outboards, having the correct factory documentation is just as important as the parts themselves. At Buckshot Racing #77, we offer genuine Mercury High Performance factory service manuals covering the most iconic engines in the lineup—245 HP Carb, 260 EFI, and 280 EFI (Short Shaft & Offshore).
These are original OEM Mercury manuals, not reprints, and are long-discontinued, making them highly sought-after by racers, engine builders, and serious Mercury enthusiasts. If you’re working on a 2.5L performance platform, this is the exact information Mercury Racing technicians used to build, diagnose, and service these engines.
Mercury 2.5L 245 Carb & 260 EFI – Factory Service Manual
This OEM Mercury High Performance service manual covers the legendary 2.5L 245 HP carbureted engines and 260 HP EFI outboards. It is an original Mercury publication, used but in good condition, complete and clean, and no longer available new.
This manual focuses on the areas performance builders rely on most. For the 245 carbureted engines, it provides detailed procedures for carburetor setup, jetting, and tuning, helping dial in throttle response and fuel delivery under load.
The 260 EFI platform includes in-depth EFI diagnostics, covering sensor testing, fuel system verification, and electrical troubleshooting.
Ignition and charging systems are documented with clear factory wiring diagrams, while cooling and lubrication systems are explained in detail.
The manual also walks through midsection inspection, lower unit service, and gearcase assembly, all presented in the same step-by-step format used in Mercury Racing service departments. Torque specifications, tolerances, and exploded views are included throughout, ensuring accuracy during assembly.
Whether you are blueprinting a 2.5L powerhead, restoring a classic Mercury performance engine, or diagnosing an intermittent issue, this manual provides the correct factory methodology. It eliminates guesswork and ensures repeatable, reliable results.
As an original Mercury factory manual, it is not a reproduction. The copy is in good used condition with intact binding and readable diagrams, making it ideal for shop use. Because it is discontinued, clean examples are increasingly difficult to source.
Mercury 280 HP EFI 2.5L – Factory Service Manual
This genuine Mercury High Performance service manual covers the 2.5L 280 HP EFI outboards, including both Short Shaft and Offshore configurations. It is a used original in good condition, complete and clean, and no longer in production.
Inside, the manual provides the full factory service sequence used by Mercury Racing technicians. It details powerhead teardown and reassembly, including precise torque values, tolerances, and clearances required for optimal performance and reliability.
EFI system coverage includes step-by-step diagnostics, sensor checks, and calibration procedures, allowing you to troubleshoot and maintain the engine correctly. The manual also includes detailed wiring diagrams for ignition and charging systems, along with clear explanations of cooling passages, lubrication flow, midsection service, and lower unit procedures.
The Mercury 280 EFI is a precision performance engine where correct assembly and setup are critical. This manual provides the exact specifications and procedures needed to maximize performance, ensure reliability, and avoid costly mistakes.
This is an original printed Mercury manual, used but in good condition with clear schematics and legible content. As a discontinued item, it is a rare and valuable resource for anyone working on the 280 EFI platform.
Essential OEM Documentation for Mercury 2.5L Performance Builds
These factory manuals cover the most desirable Mercury Racing 2.5L engines, including 245 HP carbureted, 260 EFI, and 280 EFI models. They are essential for racing, high-performance lake builds, offshore setups, and restoration projects.
At Buckshot Racing #77, we specialize in Mercury 2-stroke performance platforms, including 2.0L, 2.4L, and 2.5L V6 engines. These manuals provide the technical foundation needed to service and build these engines correctly.
If you’re working on a Mercury 2.5L 245, 260, or 280, this is the factory-level documentation you want on your bench.
Contact Mike Hill at +1-714-697-1716 or email mike@buckshotracing77.com for technical support.