Yamaha 90HP F90JB Jet Drive Outboard – 25″ Shaft
The 90-horsepower Yamaha F90JB jet-drive outboard uses a 25-inch shaft for compatible shallow-water applications. Jet propulsion reduces exposed propeller hardware, while proper shaft matching helps maintain water intake and steering control during maneuvering.
Description
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Yamaha 90HP F90JB Jet Drive Outboard Specs
| Brand | Yamaha Marine |
| Full Model Code / Part Number | F90JB (Jet Drive / 25" Shaft) |
| Country of Origin | Japan / USA |
| Engine Type & Configuration | 4-Stroke Inline 4 (SOHC 16-Valve) |
| Horsepower Output (HP / kW) | 90 HP at Powerhead / ~65 HP at Pump Jet (66 kW) |
| Displacement (cc / cu in) | 1832 cc (112 cu in) |
| Bore x Stroke (mm / in) | 81.0 x 88.9 mm (3.19 x 3.50 in) |
| Maximum RPM Range (Full Throttle Operating Range) | 5000 - 6000 RPM |
| Fuel Induction System | Electronic Fuel Injection (EFI) |
| Ignition System | TCI Microcomputer |
| Starting System | Electric Start |
| Steering System | Remote Mechanical Steering Compatible |
| Trim & Tilt System | Power Trim & Tilt |
| Gear Ratio & Shift Mechanism | Jet Pump Drive Unit (Forward - Neutral - Reverse Jet Nozzle) |
| Exhaust System | Above Water Jet Pump Exhaust |
| Recommended Transom Shaft Length | XL: 25 inches (Jet Pump Equivalent) |
| Alternator / Charging Output (Amps / Watts) | 35 Amp (Maximum) / 441 Watts |
| Recommended Fuel Grade & Oil Type | Regular Unleaded (Min. 89 Octane Recommended) / Yamalube 4M FC-W 10W-30 |
| Dry Weight (kg / lbs) | 166 kg / 367 lbs |
| Standard Warranty | 3 Years Limited Pleasure Boat Warranty |
Common Question of Yamaha F90JB
Is F90JB a jet drive?
Yes. The Yamaha F90JB is identified as a jet-drive outboard with a 25-inch shaft. Jet propulsion uses an intake, pump, impeller, and steering nozzle rather than an exposed propeller. Verify intake clearance, cooling flow, controls, fuel system, and boat compatibility before installing this high performance outboard motor.
What transom fits its shaft?
A 25-inch transom is the intended match for this Yamaha jet-drive model. Measure the hull and verify intake clearance before mounting. Correct installation supports water flow, cooling, thrust delivery, steering response, and shallow-water operation. Proper measurements support a ready to bolt marine package.
Does it use fuel injection?
Confirm the exact Yamaha fuel system before making an EFI claim. The supplied title identifies a jet-drive outboard but does not explicitly state fuel injection. Verify controls, wiring, battery, steering equipment, intake components, fuel supply, and package contents through Yamaha documentation.
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