This comprehensive Mercury Marine 250 OptiMax Jet Drive Service Repair Manual provides detailed instructions and diagrams for servicing and repairing your jet drive, covering models starting from 2002 with serial number 0E407100 and onwards. This manual is an invaluable resource for both experienced mechanics and DIY enthusiasts. The manual covers a wide range of topics, including: * **Specifications:** Find all the essential technical data for your 250 OptiMax Jet Drive. * **Maintenance:** Learn about routine maintenance procedures and schedules for optimal performance and longevity. * **General Information:** Get acquainted with the basics of the 250 OptiMax Jet Drive system. * **Jet Installation:** Understand the proper installation process for your jet drive. * **Electrical System:** Navigate the intricacies of the electrical system, including wiring diagrams and troubleshooting tips. * **Ignition System:** Gain insights into the ignition system and learn how to diagnose and repair any issues. * **Charging & Starting System:** Dive into the details of the charging and starting system, including battery maintenance and troubleshooting. * **Timing, Synchronizing & Adjusting:** Master the techniques for timing, synchronizing, and adjusting engine components. * **Fuel System:** Explore the fuel system, including fuel lines, filters, and fuel pump operation. * **Fuel Pump:** Understand the function and maintenance of the fuel pump. * **Direct Fuel Injection:** Learn about the direct fuel injection system and its operation. * **Oil Injection:** Get a comprehensive understanding of the oil injection system, troubleshooting, and maintenance. * **Emissions:** Understand the emissions system and regulations that apply to your jet drive. * **Powerhead:** Dive into the intricacies of the powerhead, covering its components and maintenance. * **Cooling System:** Learn about the cooling system, troubleshooting, and maintenance. * **Pump Unit:** Get detailed information on the pump unit, including its components and operation. * **Color Diagrams:** Utilize the clear, color diagrams throughout the manual for easy visualization and understanding. With its comprehensive coverage, clear instructions, and easy-to-follow diagrams, this manual empowers you to confidently perform your own repairs and maintenance on your Mercury Marine 250 OptiMax Jet Drive.

The Mercury Marine 250 OptiMax Jet Drive is a powerful and versatile outboard motor designed for a variety of watercraft, from small runabouts to larger fishing boats. This jet drive system, with its powerful 250 horsepower OptiMax engine, is known for its exceptional performance and reliability. The Mercury Marine 250 OptiMax Jet Drive combines the efficiency of a direct-injection fuel system with the durability of a jet drive propulsion system. This unique combination allows for exceptional fuel economy while providing the power and maneuverability needed for challenging waters. The jet drive system eliminates the need for a traditional propeller, making it ideal for shallow water applications and areas with potential for debris or obstacles. The system also features a robust design, capable of handling the rigors of saltwater environments and heavy use. This manual provides comprehensive information and detailed instructions for servicing and repairing all aspects of the Mercury Marine 250 OptiMax Jet Drive, ensuring that owners and technicians have the knowledge necessary to keep these powerful engines running smoothly.