Honda CB750 Custom 1981

Specs & Photos Gallery of 1981 Honda CB750 Custom - American-style Touring Motorbike

1981 Honda CB750 Custom photo. Release date: 1981-05-01.

Honda CB750 Custom that appeared in 1981. Unlike the 750 Custom Exclusive released in the previous year, it has a CB crown. Set as an American type tourer for the sports model CB750F, the common 748cc air-cooled 4-cylinder DOHC 4-valve engine has a slightly (2ps) output drop compared to the 70ps of the CB750F, and the maximum torque generation range is 7,000, which is 500 rpm lower than the CB750F. rpm. It is in line with the difference in the normal rotation range due to the different uses of the vehicle. The low seat height, pull-back handlebars, and slanted front forks made it possible to enjoy long distances in a relaxed riding position. After this model, Honda's in-line 4-cylinder American model disappeared, and vehicles equipped with V-type engines became the mainstream. (V4 VF750 Magna appeared in 1982)

Since its release in August 1969, the super sports Honda CB750F equipped with a DOHC 4-cylinder 16-valve engine with high reliability and precise mechanism backed by 12 years of production performance has been further improved (fuel economy ・Handling stability, output characteristics, etc.).
At the same time, the American-style Honda CB750 Custom was added to the CB750 series and on sale from May 1st 1981.

Picture of Honda (ホンダ) CB750 Custom (カスタム)
A collectible American style classic sport touring motorcycle.

This Honda CB750F further improves fuel economy and ease of use in the medium and low speed range, and at the same time achieves 70 horsepower, which is the largest output among domestic motorcycles. In addition, the adoption of a comfortable front air suspension and Honda's unique dual-piston caliper brakes that further improve braking performance can demonstrate excellent steering stability. In addition, the use of lightweight all-a black comstar wheels made of Lumi and duralumin forged parts emphasizes the "dauntlessness" and "high quality feel" suitable for a 750cc super sports bike.

1981 Honda CB 750 Custom.
Image of an old motorcycle in original shape.

In addition, the newly released Honda CB750 Custom is equipped with a maximum output of 68 horsepower engine as a domestic American type sports bike. By adopting , you can enjoy comfortable long-distance driving from city areas to highways. In addition, the teardrop tank (teardrop shape) and four mufflers further emphasize the solid American style. In the 12 years since its release, the CB750 series has produced a total of 828,000 units (as of February 1981), and is loved by motorcycle fans around the world. In the racing world in particular, the Honda RCB Endurance Road Racer, which was developed based on this engine, won the manufacturer's championship in the European Endurance Championship Series for four consecutive years (1976-1979). It has achieved many brilliant achievements, including the first four victories in history (1976-1979), and has been widely recognized around the world for its excellent engine performance and durability.
The domestic sales plan is to sell 9,000 units of the "CB750F" and 2,000 units of the "CB750 Custom" annually.

Main Features of Honda CB750F・Custom

Engine

Total displacement 748cm³, maximum output 70PS (68PS for custom) / 9000rpm maximum torque 6.0kg-m / 7500rpm (7000rpm for custom) DOHC 4-cylinder 16-valve engine Equipped with increased torque in the low to medium speed range, demonstrating smooth driving performance from low to medium and high speeds, and improved fuel efficiency from 32km/L to 35km/L (60km/h level driving test value) /p>

Suspension

Adoption of a front semi-air suspension that further improves ride comfort and steering stability

Brakes

Honda's unique dual-piston caliper brakes for stable braking performance and lightweight perforated disc brakes for his brakes on the front wheels

Honda CB750 Equipment

• The brake pedal, change pedal, front and rear steps, etc. are made of lightweight and textured duralumin forged parts
• Lightweight, all-aluminum black Comstar wheels and front fenders with air guides (CB 750F) for cooling the engine
• A keyed accessory case convenient for touring is newly installed in the rear seat cowl (CB 750F)
• Powerful muffler with straight-cut muffler end
  CB 750F = 4into2 muffler
  CB750 Custom = 4 mufflers

The teardrop-shaped fuel tank and four-pipe muffler gave it a dignified feel that was typical of an American model, but the specifications of each part, such as the double-disc front brake, showed that it was two sides of the same coin with the sports model CB750F. At that time, Honda meant an American type by putting the letters "custom" in the motorcycle name.

1981 Honda CB750 Custom Price

Type	CB 750F	CB750 Custom
Standard cash price	¥595,000	¥610,000

• * The Hokkaido price is 7,000 yen higher for each type. Some remote islands are excluded.

1981 Honda CB750 Custom Specifications

Main spec of CB750 Custom and CB750-F model year 1981:

Type		CB 750F	CB750 Custom
Length×Width×Height (m)		2.190×0.790×1.125	2.295×0.880×1.200
Wheel Distance (m)		1.515	1.545
Minimum ground clearance (m)		0.150	0.135
Vehicle weight (kg)		246	252
Dry weight (kg)		227	236
Fuel tank capacity (L)		20	16
Lubricant Capacity (L)		4.5
Fuel consumption rate (km/L)		35 (60km/h level running test value)
Engine model		RC01E (DOHC 4-cycle 4-valve 4-cylinder)
Total Displacement (cm3 )		748
Inner Diameter x Stroke (mm)		62.0×62.0
Compression Ratio		9.2
Max output (PS/rpm)		70/9,000	68/9,000
Max torque (kg-m/rpm)		6.0/7,500	6.0/7,000
Starting method		Self-operated
Transmission type		Constant mesh type (5-speed return)
Frame Format		Double Cradle
Tire size	(Front)	3.25H19-4PR	110/90-19 62H
	(Rear)	4.00H18-4PR	130/90-16 67H
Brake type	(front)	hydraulic disc (slotted double)	Hydraulic disc (double slotted)
	(Rear)	hydraulic disc	hydraulic disc