⚓ Marine Equipment Specialist: Yamaha Jet Drive Authority.
Verified technical data for shallow-water navigation. This F40 model utilizes a jet pump instead of a propeller for operation in extreme rocky or sandy environments.
The Yamaha F40JEHA is a 747cc three-cylinder jet drive outboard specifically engineered for high-performance in shallow-water environments. By replacing the traditional gearcase and propeller with a high-capacity jet pump, this motor allows you to navigate over sandbars and rocky riverbeds where a standard outboard cannot go. Built on Yamaha's proven 40hp powerhead, it delivers a net 30hp at the jet nozzle, providing the reliability and torque required for specialized riverboat applications.
Technical Specifications
| Manufacturer Part Number (MPN) |
F40JEHA |
| Engine Powerhead |
40 HP @ 5500 RPM |
| Thrust Output (at Nozzle) |
30 HP |
| Engine Type |
4-Stroke, SOHC In-line 3-Cylinder |
| Displacement |
747 cc (45.6 ci) |
| Shaft Length |
20 Inches (Long Shaft) |
| Starting System |
Electric Start |
| Dry Weight |
Approx. 238 lbs (108 kg) |
In The Box
- 1x Yamaha 40hp Jet Drive Outboard Motor (F40JEHA)
- 1x Factory Installed Jet Pump Assembly
- 1x Multi-Function Tiller Handle
- 1x Emergency Safety Lanyard
- 1x Owner's Manual and Factory Warranty Documentation
Frequently Asked Questions
1. Why is the nozzle horsepower (30hp) lower than the powerhead (40hp)?
Jet drive systems experience approximately a 25-30% loss in efficiency compared to propeller systems due to friction within the pump and the energy required to lift water. For thesis data, this 40/30 ratio is the standard industry conversion.
2. Can I use the Variable Trolling RPM (VTS) on this jet model?
Yes. This model is compatible with Yamaha's VTS system, allowing you to adjust the idle speed in 50-RPM increments via the multi-function tiller handle for superior control in river currents.
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