The Honda CB750 is a four-cylinder, inverted, in-line, four-cylinder, in-line motorcycle engine made by Honda for generations for the 1969-2003 and 2007 models with upright or standard upright posture. This is often called the original Japanese Universal Motorcycle (UJM).
Although other manufacturers have marketed the winding, overhead camshaft, inline four-cylinder engine configuration and layout has been used in racing engines before World War II, Honda popularized the configuration with the CB750, and the subsequent layout became the dominant sport bike. layout.
The CB750 is included in the AMA Motorcycle Hall of Fame Classic Bikes; named in Discovery "Greatest Motorbikes Ever"; is at the Art of the Motorcycle exhibition, and is at the UK National Motor Museum. Society of Automotive Engineers of Japan, Inc. establishing 1969 CB750 as one of 240 Japan Automotive Landmark Technology .
The CB750 was the first motorcycle to be called a "superbike."
Video Honda CB750
History
Honda Japan introduced the CB750 motorcycle to the US and Europe market in 1969 after experiencing success with smaller motorcycles. In the late 1960s, Honda motorcycles were, on the whole, the biggest sellers in the world. There's a C100 step-through C100 - the best-selling motorcycle of all time - C71, C72, C77, and CA77/8 Dreams; and CB72/77 Super Hawks/Sports. The sense of what lies ahead with the introduction of the revolutionary twin-cylinder CB450 DOHC engine in 1966. The advantages of this production bike funded a successful racing engine in the 1960s, and lessons learned from the race were applied to the CB750. CB750 is targeted directly in the US market after Honda officials, including founder Soichiro Honda, repeatedly meet with US dealers and understand the opportunities for larger bikes.
Initial race
In 1967, American Honda's service manager Bob Hansen flew to Japan and discussed with Soichiro Honda about the possibility of using Grand Prix technology on bikes prepared for American motorcycle events. The American race governing body, the AMA, has rules that allow racing only with production engines, and limits the valve engine up to 500 cc while allowing the Harley Davidson side valve to compete with a 750 cc engine. Honda knows that what is won on today's race track, is sold in the showroom tomorrow, and large engine capacity road machines must be built to compete with Harley Davidson and Triumph twin-cylinder engines.
Hansen told Soichiro Honda that he had to build a 'King of Motorcycles' and the CB750 appeared at the Tokyo Show in November 1968 and was publicly launched in England at the Brighton motor show, held at the Metropole Hotel exhibition center during April 1969, with a press release previously at Honda's London headquarters, the pre-production version came up with a wide, wide handlebar aimed at the US market.
The AMA Competition Committee acknowledged the need for more variations of racing motors and changed the regulations from 1970, by standardizing full 750 cc displacement for all engines regardless of valve location or number of cylinders, enabling Triumph and BSA to pack their 750 cc. from twin 500 cc Triumph Daytona.
The Honda factory responded by producing four CR750 racers, a CB750 racing production version, driven by UK-based Ralph Bryans, Tommy Robb and Bill Smith under Nakamura's supervision, and the fourth engine under Hansen driven by Dick Mann.. All three Japanese engines prepared all failed during the race with Mann surviving only to win a few seconds with a failed engine.
Hansen's historic race team victory in March, 1970 Daytona 200 with Dick Mann riding a tall CR750 for victory ahead of June, 1970 Isle of Man TT race when two 'official' Honda CB750 were included, again driven by Irishman Tommy Robb partnered in a team by Briton experienced, John Cooper. The machines were incorporated into the 750cc Production Class, a category for road-based machines that allowed a number of tightly controlled modifications. They finished in eighth and ninth places. Cooper was interviewed in the British monthly Motorcycle Mechanics magazine, which said the two riders were not happy with Honda handling their goods, and that he would not ride in next year's race "unless the bike has been greatly improved".
In 1973, Japanese rider Morio Sumiya finished in sixth place in the 200-Mile Daytona race at the 750 factory.
Maps Honda CB750
Production and acceptance
In its one year development, the CB750 has a straight four straight engine with one overhead camshaft (SOHC) and front disc brakes, both of which were previously unavailable on mainstream, affordable, motorcycle production. It has a four-cylinder engine and disc brakes, along with an introductory price of US $ 1,495 (US $ 9,977 in current money), giving the CB750 a sizable performance advantage over its rivals, especially its British rivals.
Cycle magazine called CB750, "the most advanced production bike ever", on the introduction of the bike. Cycle World called it a masterpiece, highlighting robust Honda endurance testing, 120 mph bike speed (190 km/h), free-fade braking, comfortable ride, and superb instrumentation.
The CB750 is the first modern four-cylinder engine of a major manufacturer, and the superbike term was created to describe it. Increasing the value of the motor is an electric starter, a kill switch, double mirror, flashing inflection signal, easily maintained valve, and overall smoothness and low vibration both on the way and in the stationary position. Later models from 1991 included a maintenance-free hydraulic valve.
Unable to accurately gauge demand for a new bike, Honda limited its initial investment in die production to CB750 by using a technique called permanent mold casting (often incorrectly referred to as sandcasting) rather than diecasting for the engine - unsure of bike acceptance. The fixed motor in Honda lined up for ten years, with a total production of over 400,000.
Model
Note: All CB750 engines are air/oil-cooled, compared to liquid-cooled
SOHC
Year and model code:
- 1969 CB750 (June 6), CB750K or CB750K0 (unknown date)
- 1970 CB750K1 (September 21)
- 1971 CB750K2 (AS 1 March)
- 1973 CB750K3 (US only February 1, K2 elsewhere)
- 1974 CB750K4 (US/Japan only, K2 elsewhere)
- 1975 CB750K5 (USA only, K2/K4 elsewhere), CB750FO, CB750A (Canada only) The CB750F 1975 has a sleeker look, thanks in part to a 4-to-1 exhaust and a cafe-style chair with fiberglass rear. Other changes include the use of rear disc brakes and lighter crankshaft and flywheel.
- 1976 CB750K6, CB750F1, CB750A
- 1977 CB750K7, CB750F2, CB750A1
- 1978 CB750K8 (US only), CB750F3, CB750A2
Production (round number)
CB750K0 53.400
CB750K1 77.000
CB750K2 63500
CB750K3 38,000
CB750K4 60,000
CB750K5 35.000
CB750K6 42,000
CB750K7 38.000
CB750K8 39,000
CB750F 15.000
CB750F1 44.000
CB750F2 25.000
CB750F3 18.400
CB750A 4.100
CB750A1 2,300
CB750A2 1.700
DOHC
- 1979-1982 CB750K
- The 10th edition of 1979 CB750K (5,000 produced for the US)
- 1979-1982 CB750F
- 1980-1983 CB750C "Special"
- 1982-1983 CB750SC Nighthawk
- 1984-1985 CB750SC Nighthawk "S" in Canada
- 1984-1986 CB700SC Nighthawk "S" in the US
- 1984-1986 CB750SC Nighthawk (Horizon in Japan)
- 1992-1997 CB750F2
- 1991-2003 CB750 Nighthawk
- 2007 CB750 (Japan only)
CB750A Hondamatic
In 1976, Honda introduced the CB750A to the United States, with a A ending pointing "automatic," for its automatic transmission. Although the two-speed transmission includes a typical torque converter of automatic transmission, the transmission does not automatically change the gear for the rider. Each tooth is selected by a foot-controlled valve/selector (similar in operation with a manual transmission motorcycle). The foot selector controls the application of high pressure oil to a single clutch package (one clutch for each tooth), causing the selected clutch (and gear) to engage. The selected gear remains selected until modified by the rider, or the kickstand is lowered (which shifts the transmission to neutral).
CB750A is only sold in the North American and Japanese markets. The name Hondamatic was shared with a Honda car in the 1970s, but the motorcycle transmission was not fully automated. The transmission design is similar in concept to transmission in the Honda N360AT, the kei car sold in Japan from 1967-1972.
CB750A uses the same engine as the CB750, but detuned with a lower 7.7: 1 compression and smaller carburetor produces lower output, 35.0 kW (47.0 hp). The same oil is used for engines and transmissions, and the engine is converted into a wet sump rather than a dry sump type. The lockout security device prevents the transmission from moving neutral if the side holder is off. There is no tachometer but the instrument includes a fuel gauge and a tooth indicator. For 1977 the gearing was revised, and the exhaust turned into four into two with a silencer on either side. Due to the slow sales, the model was discontinued in 1978, although Honda later introduced the smaller Hondamatic motorcycle (ie CB400A, CM400A, and CM450A). Cycle World tested the 1976 CB750A's top speed at 156 km/h (97 mph), with 0 to 60 mph (0 to 97 km/h) time of 10.0 seconds and stands 0 to 1 / 4 mi (0.000.40 km) time 15.90 seconds at 138.95 km/h (86.34 mph ). Braking from 60 to 0 mph (97 to 0 km/h) is 39 m (129 ft).
Nighthawk 750
From 1982 to 2003, with the exception of several years, Honda produced the CB750 known as the Nighthawk 750. The initial model was designated as the Nighthawk CB750SC while the newer model was known as the Nighthawk 750. The Nighthawk 750SC had a 4-step engine with a 5-speed manual transmission, chain drive, and front disc and rear drum brakes.
2007 CB750
In 2007 Honda Japan announced the new CB750 sales are very similar to the models sold in the 1970s. Announced as CB750 Special Edition which is in silver color of the CB750 AMA racer in the 1970s and CB750, it is offered in three color schemes that are reminiscent of the previously sold CB750. In August 2007, the bike was intended only for release in Japan.
Specifications
References
External links
- The Dream CB750 Four (Official History)
- CB750 pictures at Brighton 1969 Motorcycle Exhibition
- Boehm, Mitch (July 29, 2014), "The Honda CB750 Sandcast Prototype: In early 1969, Honda's men made four CB prototypes. is the fourth story ", Motorcyclists
Source of the article : Wikipedia
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