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Honda Marine BF4, BF5, and BF6 Portable Engines - Technical Specifications

The Honda Marine all-new BF4, BF5 and BF6 portable outboard engine models provide a complete performance package for the most comfortable journeys in small boats and dinghies. All three engines are equipped with the largest internal fuel tank in their class for extended running time, offer a simple start-stop sequence, low vibration and noise, portability and easy storage.  The engines also can be mounted with different propeller options, for greater flexibility depending on torque, speed and power requirements.

Compact and lightweight, the all-new BF models are equipped with a powerful 127cc engine that provides efficient acceleration and high levels of torque.  To help protect the engine, the Honda BF4, BF5 and BF6 outboards also feature an Oil Alert System that indicates low oil pressure. When low oil is detected, the system will automatically limit the engine speed to 2,300 rpm.  In addition, these new Honda models are easy to start, courtesy of a decompression system that serves to bleed off cylinder pressure to reduce the pulling force to start the engine. 

 

 

BF4

BF5

BF6

 

ENGINE

Engine Type

4-stroke, single-cylinder

Displacement (cc / cubic inches)

127 / 7.75

Bore x Stroke (mm / inches)

60 x 45 / 2.36 x 1.77

Compression Ratio

9.8

Wide Open Throttle Engine Speed Range

4500-5500

4500-5500

5000-6000

Rated Power [kW(HP) / rpm]

2.9(4)/5000

3.7(5)/5500

4.4(6)/6000

Fuel Delivery

Carburetor

Driven Valve System

OHV

Lubrication System

Wet Sump

DRIVE SYSTEM

Gear Ratio

(13.27) 2.08:1

Gear Shift

F-N-R

MOUNTING SYSTEM

Tilt Angle

70°

Trim Angle

16°

Trim Adjustment Range

4° (5HOLE)

Steering Angle

45° (one side)

DIMENSIONS

Transom Type (inches)

S(15) / L(20)

Overall Length (mm / inches)

524 / 20.6

Overall Width (mm / inches)

347 / 13.66

Overall Height (mm / inches)

S: 1020 / 40.16 · L: 1147 / 45.16

Transom Height (mm / inches)

S: 434 / 17.09 · L: 561 / 22.09

Dry Mass (kg / lb.)

S: 27.0 / 59.52 · L: 27.5 / 60.63

EQUIPMENT

Starting System

Recoil starter

Alternator (charging)

Optional 6A / 12V

Ignition System

Digital CDI

Tilt System

Mechanical

Built-in Tank Capacity (L / gal.)

1.5 / .4

 

Distribution channels: Automotive