This comprehensive Mercury Mariner 20 JET, 20, 25, 25 MARATHON, 25 SEAPRO Service Manual provides detailed instructions for servicing, repairing, and performing preventative maintenance on your outboard motor. This manual covers models with serial numbers starting from 0G044027 in the United States and 09807909 in Belgium and above. It is the same manual used by professional technicians, mechanics, and workshops. The manual covers a wide range of topics, including: * **Specifications:** Detailed technical specifications for your specific Mercury Mariner outboard motor. * **Maintenance:** Complete maintenance schedules, procedures, and guidelines for keeping your outboard running smoothly. * **General Information:** Overview of the Mercury Mariner outboard engine, its components, and operation. * **Outboard Installation:** Step-by-step instructions and guidelines for installing and mounting your outboard motor. * **Electrical:** Detailed coverage of the electrical system, including the ignition, charging & starting system, timing, synchronizing & adjusting, wiring diagrams, and more. * **Fuel System:** Information on the fuel system, including the carburetor, fuel pump, and emissions system. * **Powerhead:** Detailed coverage of the powerhead, including the cylinder head, pistons, connecting rods, crankshaft, and other components. * **Mid-Section:** Information on the mid-section, including the gear housing, jet drive, and other components. * **Lower Unit:** Detailed coverage of the lower unit, including the propeller, drive shaft, and other components. * **Attachments/Control Linkage:** Information on attachments and control linkage, including the throttle, shift linkage, tiller handle, side shift, and manual starter. This manual provides clear step-by-step instructions with illustrations to guide you through every repair and troubleshooting procedure. Whether you're a seasoned mechanic or a DIY enthusiast, this manual is an essential resource for maintaining and repairing your Mercury Mariner outboard motor.

The Mercury Mariner 20 JET, 20, 25, 25 MARATHON, and 25 SEAPRO outboard motors were produced by Mercury Marine between 2004 and 2006. These outboards are known for their reliable performance and versatility, making them popular choices for a range of boating activities. The 20 JET model is specifically designed for jet propulsion, offering excellent maneuverability in shallow waters. The 20, 25, and 25 MARATHON models feature traditional propeller propulsion, providing efficient speed and power for a variety of boat types. The 25 SEAPRO model is tailored for saltwater use, boasting enhanced corrosion resistance for extended durability in harsh environments. These outboards come equipped with a variety of features designed to enhance their performance and user-friendliness. They typically feature a four-stroke engine, known for their smooth operation and fuel efficiency. The engine is also equipped with a variety of safety features, including a kill switch and an emergency stop button. The outboards are also equipped with a range of control options, including a tiller handle, side shift, and manual starter, allowing boaters to choose the setup that best suits their needs. The Mercury Mariner 20 JET, 20, 25, 25 MARATHON, and 25 SEAPRO models offer a balance of power, efficiency, and reliability, making them a popular choice for both recreational and commercial boaters.