Yamaha 50HEDOL: Compact Powerhouse for Marine Propulsion The Yamaha 50HEDOL is a robust, gasoline-fueled outboard marine engine engineered for reliable boat propulsion in recreational and light-duty applications. As a 2-stroke, 3-cylinder powerhead, it delivers 50 horsepower (36 kW) at 5500 RPM, providing efficient thrust for versatile on-water performance. Key technical specifications underscore its engineering precision. With a displacement of 698 cm³, the engine achieves a high power-to-weight ratio at just 84.5 kg, making it exceptionally lightweight for its class. It operates within an optimal crankshaft speed range of 4500–5500 RPM, paired with a 13.24:1 gear reduction ratio and a 508 mm shaft length for seamless torque transmission to the propeller. The water-cooled system, utilizing seawater for thermal regulation, ensures consistent operation, while the electric start mechanism enhances user convenience. Lacking a traditional compression ratio typical of 2-strokes, it prioritizes simplicity with fewer moving parts for reduced maintenance. Performance characteristics shine in high-speed scenarios, offering rapid acceleration and agile maneuverability thanks to its balanced 3-cylinder configuration, which minimizes vibration for smoother operation compared to single-cylinder alternatives. The back-extract exhaust design optimizes flow efficiency, boosting power output while curbing emissions to align with contemporary environmental standards. Tailored for marine rigors, the 50HEDOL excels in durability against saltwater corrosion and harsh conditions, with its compact footprint ideal for space-constrained vessels. It promotes fuel efficiency through its lightweight build and efficient 2-stroke cycle, reducing overall operational costs. This engine is perfectly suited for small to medium recreational boats, such as speedboats, fishing skiffs, or tenders, where agility, speed, and simplicity are paramount. The Yamaha 50HEDOL embodies dependable marine propulsion, empowering boaters with responsive power and enduring reliability on every voyage. (248 words)