Yamaha F40 Jet Drive

The Yamaha F40 Jet Drive serves as the perfect entry-level platform for technical, shallow-water navigation. By tossing out the conventional lower unit propeller and skeg in favor of a specialized direct-drive hydrodynamic jet pump, this outboard lets you confidently traverse winding rocky streams, hidden shoals, and thin skin-water environments that would destroy standard gearcases. Because marine jet pumps experience an inherent 25% to 30% parasitic power loss compared to props, Yamaha’s highly efficient 747cc four-stroke powerhead is precision-calibrated to deliver a reliable, highly effective 30 horsepower directly at the jet nozzle.

Built around a compact, inline 3-cylinder Single Overhead Camshaft (SOHC) configuration, the F40 Jet Drive relies on a long-track induction manifold and a single electronically controlled throttle valve. This structural design drastically sharpens low-end torque and delivers crisp throttle response exactly when maneuvering through breaking rapids. Equipped with Multi-Point Electronic Fuel Injection (EFI) and a TCI Microcomputer control framework, it offers easy, turnkey starts, clean fuel consumption, and quiet operation for outdoorsmen who value absolute reliability in isolated waters.

Models Available:

• F40JEA — Premium remote mechanical configuration designed for console-steered aluminum flats skiffs or specialized river boats. Features electric starting, nitro-assist manual trim/tilt dynamics, and a short midsection optimized for jet-transom heights.

Key Features:

• Powerhead Displacement: 747cc inline 3-cylinder four-stroke (SOHC)

• Output Rating: 40 HP at the crankshaft / 30 HP at the jet pump nozzle

• Propulsion System: Hydrodynamic Outboard Jet Pump (Completely flush intake shoe)

• Control Type: Remote Mechanical or Ergonomic Front-Mounted Tiller Handle

• Fuel system: Multi-point Electronic Fuel Injection (EFI)

• Alternator Output: 16 Amps (Dependable charging to support running LED spot bars, small graphs, and livewells)

• Weight: approx. 99 kg (219 lbs) — highly athletic power-to-weight footprint for quick planning

• Ignition System: TCI Microcomputer for optimal ignition mapping

• Labyrinth exhaust cooling system for whisper-quiet idle acoustic profiles

Ideal For: Small aluminum river runners, shallow-water flats skiffs, rocky stream exploration hulls, micro-jon boats, and lightweight utility tenders.