Honda BROS 1988-1990

1987 Honda BROS PRODUCT ONE 650cc (RC31) & Honda BROS PRODUCT TWO 400cc (NC25)

Honda BROS photo.

Two models of Honda Bros, a unique road sports bike that allows you to enjoy the unique ride of a narrow-angle V-twin engine

Honda Motor Co., Ltd. has created a new type of unique road sports bike that allows you to enjoy the unique riding feel of a narrow-angle V-twin engine and excellent maneuverability from city driving to suburban and highway touring Honda Bros Product 1 (One) (647cm³) and Product 2 (Two) (398cm³) The two models were released on January 9 and January 15, 1988 respectively.

1990 Honda BROS Product 1 picture.
semi-up handlebar.

This Broth has a newly designed cylinder layout with a narrow angle (52 degrees) in order to enjoy the feeling of heartbeat in the low and medium speed range, while at the same time achieving light and extended output characteristics in the high speed range. adopted a water-cooled V-twin engine. The latest technology such as aluminum twin-tube frame and cantilevered swing arm (Pro Arm) is introduced to the frame and suspension. In addition, the innovative style that harmonizes simple, smooth curved surfaces and powerful straight lines, combined with the high-quality materials and finishes of each part, creates a unique road sports model that differs from conventional sports bikes. It is designed to meet a wider range of user needs.

	broth
	Product 1(647cm3 )	Product 2(398cm3 )
Release date	January 9, 1988	January 15, 1988
Sales plan (domestic/annual)	3,000 units	7,000 units
*National standard cash price (excluding some remote islands.)	589,000 yen *Hokkaido and Okinawa are 10,000 yen higher /td>	559,000 yen *9,000 yen higher in Hokkaido and Okinawa

Honda BROS Features

• Engine: A newly designed water-cooled, 4-cycle, SOHC valve, 52-degree V-twin cylinder, with detailed specifications such as the intake/exhaust system and valve opening/closing timing in order to achieve a pleasant driving feeling. Pursuit. In addition, two stainless steel exhaust pipes are placed on the right side, and together with the short-type muffler with a new feel, the V-twin engine's individuality and strength are emphasized.
• Body: Newly designed aluminum twin-tube frame with extra-thick (41mm diameter) front forks and cantilevered rear swingarm. In addition, the combination of newly designed aluminum cast wheels (17 inches for both front and rear) with wide tires (110/80 for front, 150/70 for rear) makes it possible to fully enjoy driving.
  The front brake employs a large diameter (320mm) floating disc plate with an odd-shaped opposed 4-pot caliper. It improves the brake feeling.
  The separate duralumin handlebars, together with the aluminum steps and bracket mounting positions, ensure a comfortable riding position.
  In addition, consideration has been given to usability by adopting retractable luggage hooks and an adjustable front brake lever.

1987 Honda BROS Main Specifications

		BROS(PRODUCT ONE)	BROS(PRODUCT TWO)
Model		RC31	NC25
Total length (m)		2.060	2.060
Width (m)		0.695	0.695
Total height (m)		1.050	1.050
Wheel Distance (m)		1.430	1.425
Minimum ground clearance (m)		0.155	0.155
Seat height (m)		0.770	0.770
Vehicle weight (kg)		181	180
Dry weight (kg)		165	164
Capacity (persons)		2	2
Fuel efficiency (km/L) 60km/h level running test value		36.0	40.0
Minimum turning radius (m)		2.8	2.8
Engine type		RC31E (water-cooled, 4-stroke, V-twin)	NC25E /> (Water-cooled, 4-stroke, V-twin)
Total Displacement (cm3 )		647	398
Inner Diameter x Stroke (mm)		79.0×66.0	64.0×62.0
Compression Ratio		9.4	10.0
Max output (PS/rpm)		55.0/7,500	37.0/8,500
Max torque (kg-m/rpm)		5.7/6,500	3.5/6,500
Carburetor type		VDG3	VDF1
Starting method		Self-operated	Self-operated
Ignition method		Full transistor	Full transistor
Lubrication method		Pumping splash combination method	Pumping splash combination method
Lubricant capacity (L)		2.8	2.8
Fuel tank capacity (L)		12	12
Clutch type		Wet multi-plate coil spring	Wet multi-plate coil spring
Transmission type		Constant mesh 5-speed return	Constant mesh 5-speed return
Transmission ratio	1st	2.571	3.000
	2 speed	1.882	2.055
	3 speed	1.500	1.590
	4 speed	1.240	1.318
	5 speed	1.074	1.130
Reduction ratio (primary/secondary)		1.763/2.687	2.058/2.750
Caster (degrees)		27°00′	27°00′
Trail (mm)		111	111
Tire size	Front	110/80-17 57H	110/80-17 57H
	After	150/70-17 69H	150/70-17 69H
Brake type	Front	Hydraulic disc	Hydraulic disc
	After
Suspension method	Front	Telescopic	Telescopic
	After	Swing Arm (Pro Arm)	Swing Arm (Pro Arm)
Frame format		Diamond	Diamond