News Releases 2002

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Power Products
February 8, 2002

Honda Introduces the New BF175 4-stroke Marine Outboard Motor

Tokyo, February 8, 2002 Honda Motor Co., Ltd. today introduced the new 4-stroke marine outboard motor BF175. This extremely economical and reliable engine bolstered by Honda 4-stroke technology achieves environmentally friendly performance that exceeds the world痴 strictest emissions regulations established for 2008 by the California Air Resources Board (CARB) in the U.S. The model will go on sale March 14 at dealers nationwide handling marine outboards.

BF175 was developed based on the 3.5-liter V-6 engine used in the Lagreat minivan. Featuring Honda technologies such as Programmed Fuel Injection, the model maintains smooth, even power output through the entire speed range. The low levels of vibration and noise are further dampened by the addition of a large capacity intake silencer, resulting in the quietest operating noise level in the class.

Styling for the BF175 takes advantage of the V-6 engine layout that strives for an image of advanced technology and high functionality. This design also makes the model easy to use in dual outboard configurations, and is in harmony with a variety of boat designs.

The BF175 will be exhibited at the Tokyo International Boat Show and Osaka International Boat Show.

4-stroke Outboard motor BF175

4-stroke Outboard motor BF175

Annual worldwide projected sales BF175 300 units


Manufacturer's recommended retail price (excluding consumption tax)  






* Photographed








Major features of the BF175

High performance
V-6, 3.5-liter, 4-stroke engine has achieved engine performance approximately equal to that of a two-stroke engine.

Excellent combustion efficiency through programmed fuel injection and highly precise air-fuel ratio control through an O2 feedback system, ensure improvements in fuel economy.

Good Environmental Performance
In addition to exhaust emissions that are well below the levels required by both the U.S. Environmental Protection Agency (EPA) for 2006 and domestic Japanese voluntary controls, BF175 also exceeds the world's strictest emissions regulations established for 2008 by the California Air Resources Board (CARB).
The V-6 configuration combined with a large-capacity silencer ensures best-in-class quiet operation.
A recyclability rate of 94% has been realized.(According to Honda measurement standards)

Lightweight & Compact
The engine configuration has been designed to realize a slim overall form, easily installable even on boats designed for similarly classed two-strokes.
The intake manifold and undercover made of lightweight plastic contribute to an overall reduction in weight.

A battery charger to which various accessories can be attached offers a maximum capacity of 60A, the largest in the class. Over two times greater power than others in the same class is available at low revs. (45A at 1,000 rpm)
Counter-rotation spec. established, ensuring stability in the event that two units are installed on a large-size boat.
(Type: XCN, production on order)

Durable & Reliable
Oil pressure alert, overheat alert, rev. limiter, programmed fuel injection warning, ACG warning, and other alert functions ensure instant recognition of any malfunction or abnormal operation.
Programmed fuel injection ensures reliable starting and stable idling.

Easy to Maintain
The flush valve joint positioned near the front of the engine and other convenient design features allow easy maintenance from aboard the boat.
The engine cover lock opens with a single lever, allowing fast, easy removal of the engine cover.


Model BF175A
Dimensions (L x W x H) (mm) 920 x 625 x 1,670 (Type: LN)
Transom Height (mm) LN: 508 XN: 635 XXN: 762
Engine 4-stroke 60コV-6 vertical shaft
Displacement (cm3) 3,471
Bore x Stroke (mm) 89 x 93
Compression Ratio 9.4
Valve train 4-valve OHC
Maximum Power Output [kW(PS)/rpm] 128.7(175)/5,500
Maximum torque [Nキm(kgfキm)] 265(27.0)
Recommended Speed Range (rpm) 5,000 - 6,000
Idling Speed Range (rpm) 650ア50
Fuel Supply System Programmed Fuel Injection
Fuel Unleaded gasoline for automobiles
Lubrication System Wet sump
Cooling System Liquid-cooled (with thermostat)
Ignition System Fully transistorized battery ignition
Starting System Electric
Exhaust System Propeller boss exhaust
Charging Performance 12V-60A
Dry Weight (with propeller) (kg) 270 (LN)