Yamaha 115CETOX Outboard Marine Engine The Yamaha 115CETOX is a high-performance, gasoline-powered outboard engine engineered for dependable marine propulsion, delivering robust power to mid-sized vessels navigating coastal and offshore waters. As a 4-cylinder, 2-stroke V4 configuration with a displacement of 1,730 cm³, it produces 115 horsepower (84 kW) at peak output, complemented by a calculated torque of 167 Nm for responsive acceleration and sustained cruising. Key technical specifications underscore its engineering precision: a lightweight yet durable 171 kg (376 lbs) aluminum construction with a 635 mm shaft length, optimized for standard transom mounting. The fuel-injected gasoline system ensures clean combustion, while the integrated electric start system facilitates effortless ignition even in adverse conditions. Operating within a versatile RPM range of 4,500 (minimum for efficient idling) to 5,500 (maximum for top-end speed), it features a 13:26 reduction gear ratio that amplifies low-end torque for superior mid-range thrust. The CETOX designation highlights Yamaha’s proprietary corrosion-resistant treatments, including chromate-oxidized coatings on critical aluminum components, providing exceptional protection against saltwater electrolysis and galvanic degradation. In marine-specific applications, the 115CETOX excels in harsh environments, offering unmatched reliability through its shaft-driven propulsion and simplified 2-stroke architecture, which minimizes moving parts for easier field maintenance—though it demands premium two-stroke oil mixes to mitigate carbon deposits. Performance characteristics shine in balanced power delivery: the V4 layout delivers smooth, vibration-dampened operation, enabling fuel-efficient cruising at lower RPMs while unleashing agile planing and high-speed capabilities up to 30+ knots on appropriately sized hulls. Ideal for fishing boats, small yachts, or performance-oriented runabouts weighing 1,500–2,000 lbs, the Yamaha 115CETOX combines power density with corrosion resilience, making it a trusted choice for anglers, recreational boaters, and commercial operators seeking durable, no-nonsense propulsion in saltwater realms. (Word count: 278)