⚓ Marine Equipment Specialist: Yamaha Jet Drive Authority.
Providing authentic Yamaha Marine engineering with expert technical support for shallow water navigation and riverbed jet boat applications.
The Yamaha F115JB (115hp Powerhead / 80hp Jet) is specifically engineered for high-performance in shallow-water environments. By utilizing a high-capacity jet pump instead of a traditional gearcase and propeller, this motor allows you to navigate over sandbars and rocky riverbeds without the risk of impact damage. Built on Yamaha's proven 1.8L In-Line 4 platform, the F115JB delivers the torque and reliability required for heavy loads in shallow water operations.
Technical Specifications
| Model / MPN |
F115JB (Jet Drive) |
| Thrust Output (at Nozzle) |
80 HP |
| Engine Powerhead |
115 HP @ 5800 RPM |
| Engine Type |
1.8L In-Line 4-Cylinder DOHC 16-Valve |
| Shaft Length |
25 Inches |
| Induction System |
Electronic Fuel Injection (EFI) |
| Weight |
Approx. 378 lbs (171 kg) |
In The Box
- 1x Yamaha 115/80hp Jet Drive Motor (F115JB)
- 1x Factory Installed Jet Pump Assembly
- 1x Owner's Manual & Service Schedule
- 1x Factory Warranty Documentation
- *Note: Rigging Kit, Controls, and Gauges sold separately.
Frequently Asked Questions
1. Why is the nozzle horsepower (80hp) lower than the engine power (115hp)?
Jet drives lose approximately 30% of power compared to propeller-driven motors due to the friction and energy required to pump water. The engine provides 115hp, but the actual force pushing the boat is equivalent to 80hp.
2. Can I convert this back to a propeller motor later?
While technically possible by replacing the entire jet pump with a standard gearcase, it is a significant mechanical undertaking. These motors are optimized at the factory for jet use.
Marine Equipment Specialist | Yamaha Marine Specialist | Genuine Provider
