Tohatsu M90 Marine Engine: Reliable Inboard Propulsion for Versatile Boating The Tohatsu M90 is a robust, gasoline-powered inboard marine engine engineered for dependable boat propulsion in demanding aquatic environments. Delivering 90 horsepower (66 kW) of crankshaft power, this 3-cylinder outboard alternative excels in providing smooth, efficient thrust for a wide range of vessels, from recreational craft to utility boats. Key technical specifications underscore its engineering excellence. With a displacement of 1,267 cm³, the M90 optimizes torque and fuel efficiency through its inline 3-cylinder configuration. It operates at a fixed 5,000 RPM (minimum and maximum), ensuring consistent performance without variable speed complexities. The lightweight design weighs just 125 kg (275 lbs), boasting an impressive power-to-weight ratio for agile handling. Seawater cooling safeguards against corrosion in saltwater conditions, while the electric start system facilitates effortless ignition. Transmission options include shaft lengths from 20.3″ to 25.3″, paired with a 13:26 reduction ratio for precise power transfer to the propeller. It is compatible with A11-A21 series propellers, allowing customization for optimal thrust and speed. In marine applications, the M90 shines with tailored benefits that enhance seaworthiness and longevity. Its seawater-cooled system resists galvanic corrosion, making it ideal for coastal and offshore use, while the modular design simplifies routine maintenance and reduces downtime. The high efficiency minimizes fuel consumption without sacrificing power, promoting sustainable operation on extended voyages. Performance-wise, the M90 offers robust propulsion with balanced power delivery, enabling medium-sized boats to achieve reliable speeds and maneuverability in varied sea states. Its compact footprint and electric start contribute to seamless integration and operator safety, often aligning with auxiliary systems in lifeboats or tenders. Ideal for small to medium vessels—such as fishing boats, yachts, or workboats—the Tohatsu M90 combines technical precision with practical versatility, ensuring confident navigation across inland waters or open seas. Whether for leisure or professional duties, it stands as a testament to Tohatsu’s commitment to durable, high-performance marine engineering. (Word count: 278)