2020 Yamaha F90JB

Engine Information
Propulsion:Outboard Jet

The adventure begins the second you start up a Yamaha Jet Drive four stroke. Propeller-free and powerful, these nimble four strokes boldly go where no conventional outboard would dare. Skinnies. Shallows. Rocky-bottom rivers. Sandbars. Shoals. Rapids. They’d all prove treacherous for a propeller driven outboard, but a jet drive is all over it. Lightweight, versatile and quiet, our jet drive four strokes come in a wide range of horsepower options to fit your boat and application. Think of them as the SUV of outboards.

Start exploring now—by taking a look at the unique advantages of Yamaha Jet Drive four strokes:

Incredible Maneuverability
With no gearcase or propeller extending below the hull, a jet drive allows you to maneuver around or pass over obstructions that would limit the travel of a conventional, propeller driven outboard.

Fuel Efficiency
Yamaha jet drives are amazingly fuel efficient.

Amazingly Quiet
Sneak up on the fish. Yamaha jet drives are incredibly quiet.

Incredible Coverage
Yamaha covers its jet drive powerheads with a Three-Year Limited Warranty and jet pump systems with a Two-Year Limited Warranty for pleasure use.


  • Engine Type: 4 cyl.
  • Displacement: 97 ci (1596 cc)
  • Bore x Stroke: 79 x 81.4mm (3.11 x 3.20in)
  • Prop Shaft Horsepower: 65hp @ 5500rpm
  • Compression Ratio: 9.6:1
  • Fuel Induction: DOHC Fuel Injection
  • Exhaust: Through Jet Pump
  • Intake: Single Throttle Valve
  • Ignition: TCI Micro Computer
  • Spark Plug: LFR6A-11-00-000
  • Alternator Output: 25A
  • Starting System: Electric
  • Lubrication: Wet Sump
  • Engine Oil Capacity: 3.7L/3.5L w/without filter
  • Full Throttle RPM Range: 5000 ~ 6000 rpm
  • Cooling: Water/Thermostatic Control
  • Recommended Engine Oil: Yamalube® 4-M (See Owner’s Manual)
  • Recommended Fuel: Regular Unleaded (Minimum Pump Octane 87)
  • Recommended Fuel Filtration: Yamaha Mini 10-Micron Fuel/Water Separating Filter (external)
  • Ethanol Blend Limit: 10% Maximum
  • Gear Ratio: Direct Drive
  • Gear Shift: Forward, Neutral, Reverse
  • Shaft Length: Fits 25″ transoms
  • Degree of Tilt: 70°
  • Degree of Trim: -4 through 16°
  • C.A.R.B. Rating: 3-Star
  • Dry Weight: 177kg (391 lbs)w/jet pump assembly
  • Steering Angle (maximum): 35° from center, either direction
  • Warranty: 3 Year Limited Pleasure Boat – 2 Year Pump Assembly – 1 Year Limited Commercial
  • Spec Weight: 3
  • midrange-warranty