The Yamaha F90JB (F90JB) is engineered for extreme shallow-water performance where traditional propeller-driven outboards cannot operate. Built on the powerful 1.8-liter four-cylinder SOHC platform, this jet-propulsion unit delivers 65hp at the pump with the reliability of a 90hp powerhead. With its 25-inch shaft and Electronic Fuel Injection (EFI), the F90JB is the premier choice for river running, rocky shoals, and white-water navigation, providing exceptional maneuverability and peace of mind.
Technical Specifications
| Model Number / MPN |
F90JB |
| Horsepower (Pump/Jet) |
65 HP @ 5500 RPM |
| Shaft Length |
25 Inches |
| Engine Type |
1.8L Inline 4-Cylinder / SOHC |
| Starting System |
Electric Start / Power Trim & Tilt |
| Exhaust |
Through Jet Outflow |
| Alternator Output |
35 Amp |
| Dry Weight |
Approx. 370 lbs (168 kg) |
Propeller-Free Innovation
- Jet Pump Propulsion: Allows for operation in just inches of water, eliminating the risk of propeller damage from rocks and underwater debris.
- Turnkey EFI Reliability: Multi-port Electronic Fuel Injection provides smooth idling, turnkey starts, and maximum fuel efficiency.
- Integrated Power Trim & Tilt: Fine-tune the engine's running angle for optimized shallow-water performance directly from the console.
- YDC-30 Corrosion Protection: Yamaha's exclusive anti-corrosion alloy and multi-layer paint protect internal and external components.
- SmartCraft® / Command Link® Ready: Monitor vital engine data in real-time through Yamaha's digital networking gauges.
Navigate the Unreachable
The Yamaha F90JB Jet is built for the rugged explorer. By replacing the lower unit with a high-volume jet pump, this outboard significantly reduces draft, allowing you to reach fishing spots that other boaters can only dream of. Its inline-four configuration offers smooth operation with minimal vibration, ensuring a premium experience in the most challenging river conditions. Protected by Yamaha’s factory support and renowned resale value, the F90JB is the benchmark for high-performance jet propulsion.
Frequently Asked Questions
1. Why is it rated at 65hp if it's a 90hp engine?
The engine powerhead produces 90hp, but jet pumps lose approximately 30% of power compared to props. It is officially certified as 65hp at the jet pump outlet.
2. Does it include the jet pump assembly?
Yes. This model is factory-equipped with the genuine Yamaha high-performance jet pump system, fully assembled and ready for installation.
Marine Equipment Specialist | Genuine Provider | Genuine Yamaha Jet Series
