This service and repair manual covers the Mercury Mariner Outboard 90 HP motor. Engineered for reliable performance, this outboard motor is designed to provide efficient power for a variety of marine applications. Its robust construction and fuel-injected system ensure dependable operation, making it a strong choice for boaters seeking dependable propulsion. This comprehensive manual provides detailed guidance for the maintenance, servicing, and repair of your Mercury Mariner Outboard 90 HP. It includes essential information on general maintenance, periodic lubrication, engine and transmission service, troubleshooting procedures, and electrical system diagnostics, along with wiring diagrams. This resource is intended to assist owners and technicians in keeping the motor in optimal working condition.