Yamaha 2.5HP F2.5SMHB 4-Stroke Outboard – 15″ Shaft, Tiller Handle, Manual Start

Yamaha F2.5SMHB 2.5HP Outboard Motor

In order to resolve the complexities of portable manual propulsion on short-transom vessels, the Yamaha 2.5 F2.5SMHB utilizes a single-cylinder OHV architecture with a 72cc displacement. This engineering configuration features a 360-degree steering system and a 2.08 to 1 gear ratio to maximize rotational efficiency on inflatable boats or small aluminum tenders. By optimizing the torque curve through this refined 4-stroke design, the motor achieves superior hydrodynamic efficiency when paired with 15-inch transom hulls requiring a multi-function tiller for ergonomic operator steering and a manual recoil start system for lightweight portability.

Maintaining structural integrity ensures the Yamaha 2.5 F2.5SMHB remains impervious to degradation through Yamaha’s proprietary YDC-30 aluminum alloy and sacrificial anodes for extreme saltwater protection. This offshore propulsion system integrates an internal 0.9-liter fuel tank for simplified operation while the specialized splash lubrication system ensures internal component longevity during extended excursions. The 4-stroke platform utilizes advanced thermal management to ensure full regulatory compliance with CARB 3-Star standards for low-emission transit while delivering the structural stability required for long-term service as a reliable portable marine propulsion platform.

Key Features of Yamaha 2.5 F2.5SMHB

• Output delivers 2.5HP of refined single-cylinder propulsive torque
• Advanced 4-stroke design ensures 10 percent fuel saving efficiency
• Total weight is 37 lbs for ultimate portable mounting
• Transom mount fits 15 inch short shaft applications
• Manual start system provides reliable ignition without battery power
• YDC-30 alloy housing protects internal drive components from salt
• Private use includes 3 year limited manufacturer warranty