90-859769 Service Manual – Mercury/Mariner 200 & 225 Optimax DFI

90-859769 Service Manual Overview

The 90‑859769 Service Manual is the official factory-issued guide for Mercury/Mariner 200 and 225 Optimax Direct Fuel Injection (DFI) models with serial numbers 0G960500 and up, published in July 1999. This OEM manual provides detailed factory instructions for servicing advanced fuel-injected powerheads.

System Coverage & Models

While designed specifically for the 200 HP and 225 HP Optimax DFI engines, its comprehensive scope and technical diagrams make it highly valuable for mechanics working on similar high-performance fuel-injection outboards.

Technical Features & Highlights

Included are:

• Detailed exploded diagrams and schematics for clarity

• Step-by-step instructions covering powerhead removal, fuel injection system maintenance, ignition, electrical systems, and diagnostics

• Exact torque specifications, maintenance schedules, and troubleshooting guides—all built to the same standards used by Mercury Marine's technicians.

Availability & Condition

Available as:

• Used but complete printed copies, often with minor wear yet fully intact and functional.

• Revisions like R1, R2, and R03 are also circulated, some with improved layouts or updated diagrams—sought after for workshop use.

Arizona Outboard Dismantlers supplies authentic marine manuals trusted by professionals and DIY enthusiasts alike. The 90-859769 Service Manual delivers the factory-level detail you depend on for serious outboard engine work.