90-855348R1 Service Manual – Mercury/Mariner 200-225HP Optimax

This Mercury Optimax Service Manual (90-855348R1) gives you original factory procedures for maintaining 200HP and 225HP Optimax DFI engines. Printed in 1998 by Mercury Marine, it covers United States serial numbers 0G386496 and above.

The book includes instructions for repairs on the powerhead, EFI fuel injection system, ignition timing, oil pump, remote harnesses, and throttle/shift cables. Clear exploded diagrams and factory torque specs help you complete each task accurately.

Follow step-by-step procedures for break-in, relay installation, oil tank connection, throttle control service, and sensor inspection. Diagnostic charts help you identify fuel and electrical issues fast, keeping your Optimax running smoothly.

Because Mercury engineers wrote this manual, you can trust every procedure meets factory standards. It works well in both professional workshops and home garages. Durable pages resist oil, grease, and frequent use, making the manual ideal for real-world repair environments.

Arizona Outboard Dismantlers stocks genuine guides like this Mercury Optimax Service Manual to help you protect your Optimax investment and stay on the water longer.