Outboard Engine (Petrol/SI) · Shaft Line & Propulsion
Reliable operation and preventative maintenance are key to ensuring the longevity of any marine engine. The American Honda Motor THNXM4.952G0 is a powerful outboard engine designed for demanding marine applications. This 4-stroke, 8-cylinder V-engine delivers 261 kW of power and is EPA certified for the model years 2026. The THNXM4.952G0 features sequential multiport fuel injection, a naturally aspirated design, and seawater cooling, all contributing to its performance and durability. Common failures can include issues related to ignition, fuel delivery, cooling, gearcase lubrication, and corrosion. To maintain optimal performance, it's essential to regularly inspect and service components such as spark plugs, fuel filters, the water pump, gearcase, propeller, and anodes. Refer to the manufacturer's documentation for specific service intervals, part numbers, and operating parameters.
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What our service work and the manufacturer documentation say about keeping this model running.
Check cooling-water discharge, intake condition and the water-pump service history, and inspect the gearcase for oil leakage or impact damage. Inspect spark plugs, ignition components, fuel filters, hoses and connections for deterioration or contamination. Check propeller, propeller shaft, anodes, skeg, trim and tilt system and steering connections for damage and secure attachment. Inspect the engine mounting and transom for movement, cracking or corrosion. Verify alarms, emergency stop lanyard or equivalent shutdown device, neutral-start interlock and control operation where fitted. For cylinder dimensions, rotational speed, pressures, clearances, temperatures, wear limits and setting values, refer to the manufacturer documentation for the exact figure.
Carry spark plugs specified for the engine, fuel-filter elements, approved fuel and cooling-system service items, water-pump service parts, gearcase drain seals, propeller hardware and sacrificial anodes. Useful operational spares can include an appropriate spare propeller, ignition or sensor components, fuses and trim/tilt service items according to the installed control system. Refer to manufacturer documentation for the exact spare selection.
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