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BF90 Honda Marine Engine

BF90 Honda Marine Engine
The BF20 delivers unrivalled innovation to the portable range. Powerful, efficient and clean operation


Performance and Efficiency

4-Stroke Design

World-renowned Honda quality combines proven reliability and superior fuel efficiency, with no oil mixing.


Weighing in at only 359 lbs, the BF90 is one of the lightest in its class.

VTEC® - Smooth acceleration and power.

Honda’s Variable Valve Timing & Lift Electronic Control (VTEC®) system provides power where and when you need it. VTEC gives you a broader, flatter torque curve and smooth power delivery throughout the engine’s operating range. The result is a superior combination of power, torque and fuel economy. VTEC is the modern replacement for displacement.

Programmed Fuel Injection - Powerful performance

Programmed Fuel Injection delivers the precise amount of fuel/air to each cylinder. The result is easy starts and instant throttle response with superior fuel efficiency.

Lean Burn Control® - Superior fuel efficiency

Lean Burn Control® increases fuel efficiency by allowing combustion to operate on a leaner air/fuel mixture. At cruising speed, this engine runs on up to 20% less fuel* than others in its class.
*Based on EPA Specific Fuel Consumption Mode.

BLAST® System - improves acceleration at low speeds

Boosted Low Speed Torque, or BLAST, improves acceleration at low speeds. A quick movement of the throttle control activates the BLAST® system, advancing the ignition curve aggressively. "Hole Shot" is vastly improved as more horsepower gets the hull up on plane quicker.

High Performance Gearcase - gets you going faster

Designed to get you going faster, the BF90's gearcase reduces drag, greatly reduces hull porpoise and minimizes spray, thus increasing acceleration and top speed.

  • iA longer anti-ventilation plate helps trap water flowing to the propeller to minimize porpoising
  • A streamlined front and longer bullet reduce drag for enhanced acceleration and fuel efficiency
  • And a 2.33:1 gear ratio affords the use of 13- to 14-inch diameter propellers for heavier loads.

Torsion Dampener - improved handling.

Sometimes called a flywheel, it is located near the base of the powerhead. This design lowers the center of gravity for improved handling.

SOHC 4 Valve/Cyl. Design - max power

The BF90’s powerful 1.5L, 4-cylinder design utilizes a single overhead cam, and two intake valves to deliver maximum torque and power.

Reliability and Durability

Legendary Honda Reliability

The technology we applied to our 90hp outboard engine is the very same that powers one of the most popular cars in the world, the Honda Fit.

3-Way Cooling System - Cool running durability

Three separate cooling systems keep the cylinder heads running cooler for long-term durability.

Engine Alert System - Keeps you informed

The Engine Alert System uses visual, audio and RPM reduction circuits to alert the operator of over-heating, low oil PSI and over-revving, preventing engine damage.

4-Front Corrosion Protection System - Fights the elements

The Corrosion Protection System is a patented "Double Sealed" multi-layered paint process. Sacrificial anodes and stainless steel technology, along with waterproof connectors, all enhance corrosion protection.

Top Mounted Electronics

The alternators, ignition and other critical electrical components are mounted near the top of the powerhead to stay cool and dry. The result? Dependable performance.

Sealed Starter - Protection for long life

The starter motor is inverted into a sealed chamber that protects the starter drive from the elements.

Positive Lubrication

A crankshaft-driven, automotive-style trochoid oil pump ensures long-term durability of critical engine components.

Fresh Water Flushport

Flushes debris and saltwater out of the engine, extending the life of the outboard.

Ultra Low 3 Star CARB Emissions

Environmentally conscious technology. All Honda Marine engines exceed the highest CARB 3-Star rating to meet the rigorous California Air Resource Board's standards.

Convenience and Ease of Use

Superior Battery Charging - More usable power

There's always plenty of electric power with Honda's exclusive neodymium magnet flywheel. The alternator develops 44 amps in total and 35 amps of charging amps, it's twice the output of some competitors. It provides high output and keeps battery banks charged all day, even when running multiple accessories.

3 Position Tiller Handle

The 3 Position Tiller Handle adjusts to your comfort for easiest hull maneuverability.

Easy Maintenance

An easy "screw-type" valve adjuster system requires no shims, which reduces maintenance costs. Front-mounted oil filter and oil filler make for easy maintenance.

Center Mount Tiller - Easier control

The ergonomically designed tiller handle is longer for improved handling. Adjustments for throttle and steering friction allow easier control. Up front shift lever, PTT switch, and engine alert lamps provide added convenience.

Built-In Pitot Tube

Built-in pitot tube in the gear case eliminates the need to drill holes in your boat for installation.

Available in both 20 and 25 inch shaft models



Type 4-Stroke SOHC 4 Cylinder/16 Valves
Displacement 1,496 cc (91.4 cubic inches)
Bore & Stroke 73 mm x 89.4 mm (3.0 x 3.5 inches)
Full Throttle RPM Range 5,300-6,300 RPM
Rated Power 90 HP @ 5,800 RPM
Cooling System Water Cooled
Fuel Delivery Programmed Fuel Injection
Ignition System MicroComputer Programmed
Starting System Electric
Exhaust Through Hub
Lubrication Wet Sump
Trim Range -4° to +16°
Tilt Range 68°


Gear Ratio 2.33:1
Gear Shift F-N-R


Alternator (Electric Start) 44 Amp
Battery Charging Power 35 Amp
Propeller Optional
Power Tilt NA
Power Trim & Tilt Standard
Gas Assisted Tilt NA
Oil Pressure Alert Standard
Temperature Alert Standard
Rev-Limiter Standard
Speedometer Pickup Standard


Overall Width 480 mm/18.9 inches

Dry Weight

L-Type 163 kg/359 lbs.
X-Type 166 kg/365 lbs.

Transom Height

L Type 508 mm/20 inches
X Type 635 mm/25 inches


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