1) Mercury High Performance 280 HP EFI 2.5 (Short Shaft & Offshore) — Factory Service Manual
 
This genuine Mercury High Performance factory service manual covers the 2.5-liter 280 HP EFI outboards in both Short Shaft and Offshore configurations. It’s a used copy in good condition, clean and complete, and it’s no longer available new—making it a rare, highly sought-after reference for racing teams, performance shops, and serious DIY owners.
 
What the Manual Delivers
Inside you’ll find the full workshop sequence Mercury techs used on the 2.5L 280 EFI platform. The book walks through powerhead teardown and reassembly, shows correct torque specifications and clearances, and explains how to diagnose EFI issues with step-by-step sensor checks and calibration workflows.
 
Ignition and charging systems are presented with readable wiring diagrams. Cooling and lubrication paths are mapped clearly. Mid-section service and lower-unit and gearcase procedures are laid out with the factory order of operations so you can rebuild confidently and avoid costly mistakes.
 
Why It Matters for Performance Builds
The 280 EFI responds to precision. Factory tolerances, fastener sequences, and special-tool callouts make the difference between a strong, reliable engine and one that leaves power on the table.
 
This manual gives you the exact information Mercury Racing published for professional shops, so you can blueprint a powerhead, chase down a stubborn electrical fault, or refresh an Offshore mid knowing the specs are correct.
 
Condition & Authenticity
This is an original printed Mercury factory shop manual. It’s used but good shape with crisp schematics and legible procedures, ready for bench use. Because it’s discontinued, clean copies like this are increasingly hard to find.
 
Covers Mercury High Performance 2.5L 280 HP EFI outboards in Short Shaft and Offshore variants. If you’re maintaining, restoring, or racing a Mercury 2.5 280 EFI, this is the service and repair manual you want on the workbench.
 
2) Mercury High Performance 2.5L — 245 HP Carb & 260 HP EFI — Factory Manual
 
This authentic Mercury High Performance service and repair manual covers the iconic 2.5-liter 245 HP carbureted and 260 HP EFI outboards. The book is used but in good condition, complete and clean, and it’s long discontinued—no longer offered new. It remains the definitive reference for owners and shops that demand factory accuracy on the Mercury 2.5 platform.
 
What the Manual Delivers
Coverage is deep where performance owners need it most. Carburetor setup and jetting for the 245 are explained with practical test values to dial in throttle response. EFI diagnostics for the 260 detail sensor checks, fuel system verification, and electrical troubleshooting.
 
Ignition and charging systems are documented with clear wiring diagrams. Cooling, lubrication, mid-section inspection, and gearcase and lower-unit assembly are presented with the same step-by-step approach Mercury used in professional service bays, backed by torque tables and measured clearances.
 
Built for Reliable, Repeatable Results
Whether you’re blueprinting a 2.5L powerhead for racing, restoring a classic performance outboard, or solving an intermittent fault that generic guides gloss over, the factory sequences and specifications in this manual give you the confidence to do it right the first time. You get the real workshop methodology, complete with special-tool references and exploded views that make complex jobs straightforward.
 
Condition & Authenticity
This is an original Mercury factory manual, not an aftermarket reprint. It’s used but well kept, with intact binding and readable diagrams—ideal for repeated bench use. Because it’s no longer printed, clean, complete copies are scarce.
 
Covers Mercury High Performance 2.5L 245 HP (carbureted) and 2.5L 260 HP (EFI) outboards. If your focus is Mercury Racing hardware in the 2.5 family, this manual is the cornerstone of accurate service and dependable performance.
 
Contact Mike Hill at +1-714-697-1716 or email mike@buckshotracing77.com for technical support.