Honda CB750 and CR750

The Honda CB750 is an air-cooled, transverse, in-line-four-cylinder-engine motorcycle made by Honda over several generations for year models 1969–2003, plus 2007, with an upright, or standard, riding posture. It is often called the original Universal Japanese Motorcycle (UJM).[4][7]

Honda CB750
1969 Honda CB750
ManufacturerHonda
Also calledHonda Dream CB750 Four[1]
Production1969–2003
2007
AssemblyWakō, Saitama, Japan
Hamamatsu, Shizuoka Prefecture, Japan
Suzuka, Mie, Japan[2]
SuccessorCB900F
ClassSport bike or standard
Engine736 cc (44.9 cu in) SOHC air-cooled straight four (1969–1978)[1]
DOHC air-cooled straight 4 (1979–2003, 2007)
Bore / stroke61 mm × 63 mm (2.4 in × 2.5 in)[1]
Top speed125 mph (201 km/h)
Power51 kW (68 hp) @ 8500 rpm (1969)[3] 50 kW (67 hp) @ 8000 rpm (DIN)[1][4]
Torque44 lbf⋅ft (60 N⋅m) @ 7000 rpm
Transmission5-speed manual, chain final drive
SuspensionFront: telescopic forks
Rear: swingarm with two spring/shock units.
BrakesFront disc / Rear drum
TiresFront: 3.25" x 19"
Rear: 4.00" x 18"
Rake, trail94 mm (3.7 in)
Wheelbase1,460 mm (57.3 in)
DimensionsL: 2,200 mm (85 in)
W: 890 mm (35 in)
H: 1,100 mm (44 in)
Seat height790 mm (31 in)
Weight218 kg (481 lb)[1] (dry)
233 kg (513 lb)[5] (wet)
Fuel capacity19 L (4.2 imp gal; 5.0 US gal)[1]
Fuel consumption34.3 mpg‑US (6.86 L/100 km; 41.2 mpg‑imp)[6]

The CR750 is the associated works racer.

Though other manufacturers had marketed the transverse, overhead camshaft, inline four-cylinder engine configuration and the layout had been used in racing engines prior to World War II, Honda popularized the configuration with the CB750, and the layout subsequently became the dominant sport bike engine layout.

The CB750 is included in the AMA Motorcycle Hall of Fame Classic Bikes;[8][9] was named in the Discovery Channel's "Greatest Motorbikes Ever";[10] was in The Art of the Motorcycle exhibition,[11] and is in the UK National Motor Museum.[12] The Society of Automotive Engineers of Japan, Inc. rates the 1969 CB750 as one of the 240 Landmarks of Japanese Automotive Technology.[1]

The CB750 was the first motorcycle to be called a "superbike".[6][11]

History

Honda of Japan introduced the CB750 motorcycle to the US and European markets in 1969 after experiencing success with its smaller motorcycles. In the late 1960s Honda motorcycles were, overall, the world's biggest sellers. There were the C100 Cub step-through—the best-selling motorcycle of all time—the C71, C72, C77 and CA77/8 Dreams; and the CB72/77 Super Hawks/Sports. A taste of what was ahead came with the introduction of the revolutionary CB450 DOHC twin-cylinder machine in 1966. Profits from these production bikes financed the successful racing machines of the 1960s, and lessons learned from racing were applied to the CB750. The CB750 was targeted directly at the US market after Honda officials, including founder Soichiro Honda, repeatedly met US dealers and understood the opportunity for a larger bike.

Early racing

In 1967 American Honda's service manager Bob Hansen[13][14] flew to Japan and discussed with Soichiro Honda the possibility of using Grand Prix technology in bikes prepared for American motorcycle events. American racing's governing body, the AMA, had rules that allowed racing by production machines only, and restricted overhead-valve engines to 500 cc whilst allowing the side-valve Harley Davidsons to compete with 750 cc engines.[15] Honda knew that what won on the race track today, sold in the show rooms tomorrow, and a large engine capacity road machine would have to be built to compete with the Harley Davidson and Triumph twin-cylinder machines.

Hansen told Soichiro Honda that he should build a 'King of Motorcycles', and the CB750 appeared at the Tokyo Show in November 1968. In the UK, it was publicly launched at the Brighton motorcycle show, held at the Metropole Hotel exhibition centre during April 1969,[16][17] with an earlier press-launch at Honda's London headquarters;[16][17] the pre-production versions appeared with a high and very wide handlebar intended for the US market.[16]

The AMA Competition Committee recognised the need for more variation of racing motorcycle and changed the rules from 1970, by standardizing a full 750 cc displacement for all engines regardless of valve location or number of cylinders, enabling Triumph and BSA to field their 750 cc triples instead of the 500 cc Triumph Daytona twins.[15]

Dick Mann's Daytona-winning CR750 on display at Le Musée Auto Moto Vélo, a transportation Museum in Châtellerault, France

The Honda factory responded by producing four works-racer CR750s, a racing version of the production CB750, ridden by UK-based Ralph Bryans, Tommy Robb and Bill Smith under the supervision of Mr Nakamura, and a fourth machine under Hansen ridden by Dick Mann. The three Japanese-prepared machines all failed during the race with Mann just holding on to win by a few seconds with a failing engine.[15]

Hansen's race team's historic victory at the March 1970 Daytona 200 with Dick Mann riding a tall-geared CR750 to victory[2][18] preceded the June 1970 Isle of Man TT races when two 'official' Honda CB750s were entered, again ridden by Irishman Tommy Robb partnered in the team by experienced English racer John Cooper. The machines were entered into the 750 cc Production Class, a category for road-based machines allowing a limited number of strictly-controlled modifications. They finished in eighth and ninth places.[19] Cooper was interviewed in UK monthly magazine Motorcycle Mechanics, stating both riders were unhappy with their poor-handling Hondas, and that he would not ride in the next year's race "unless the bikes have been greatly improved".[20]

In 1973, Japanese rider Morio Sumiya finished in sixth place in the Daytona 200-Mile race on a factory 750.[21]

Production and reception

Under development for a year,[22] the CB750 had a transverse straight-four engine with a single overhead camshaft (SOHC) and a front disc brake, neither of which had previously been available on an affordable mainstream production motorcycle. This spec, married with the introductory price of US$1,495[23] (US$11,930 in current money), gave the CB750 a considerable sporting-performance advantage over its competition, particularly its British rivals.

Cycle magazine called the CB750, "the most sophisticated production bike ever" at the time of the bike's introduction.[23] Cycle World called it a masterpiece, highlighting Honda's painstaking durability testing, the bike's 124 mph (200 km/h) top speed, the fade-free braking, the comfortable ride, and the excellent instrumentation.[22]

The CB750 was the first modern four-cylinder machine from a mainstream manufacturer,[24] and the term superbike was coined to describe it.[4][9] Adding to the bike's value were its electric starter, kill switch, dual mirrors, flashing turn signals, easily maintained valves, and overall smoothness and low vibration both under way and at a standstill. Much later models from 1991 included maintenance-free hydraulic valves.

Unsure of the bike's reception and therefore unable to accurately gauge demand for the new bike, Honda limited its initial investment in the production dies for the CB750's engine by using a technique called permanent mould casting (often erroneously referred to as sandcasting), rather than diecasting.[25] The bike remained in the Honda line up for ten years, with a production total over 400,000.[26]

Models
Annual and cumulative production statistics, separated by SOHC (to 1978) and DOHC (1979 and later)

Note: All CB750 engines are air/oil-cooled, as opposed to liquid-cooled

SOHC

Year and model code:[27]

  • 1969 CB750 (6 June), CB750K or CB750K0 (date unknown)
  • 1970 CB750K1 (21 September)
  • 1972 CB750K2 (US 1 March)
  • 1973 CB750K3 (US-only 1 February. K2 elsewhere)
  • 1974 CB750K4 (US/Japan-only, K2 elsewhere)
  • 1975 CB750K5 (US-only, K2/K4 elsewhere), CB750FO, CB750A (Canada-only)[28] The 1975 CB750F had a more streamlined look, thanks in part to a 4-into-1 exhaust and cafe style seat with fiberglass rear. Other changes included the use of a rear disc brake and a lighter crankshaft and flywheel.
  • 1976 CB750K6, CB750F1, CB750A
  • 1977 CB750K7, CB750F2, CB750A1
  • 1978 CB750K8 (US-only), CB750F3, CB750A2
Model Production (rounded figures)[29]
CB750K0 53,400
CB750K1 77,000
CB750K2 63,500
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
  • 1979 CB750K 10th Anniversary Edition (5,000 produced for US)
  • 1979–1982 CB750F
  • 1980–1983 CB750C "Custom"
  • 1982–1983 CB750SC Nighthawk
  • 1984–1985 CB750SC Nighthawk "S" in Canada
  • 1984–1986 CB700SC Nighthawk "S" in US
  • 1984–1986 CB750SC Nighthawk (Horizon in Japan)
  • 1991–2003 Nighthawk 750
  • 1992–2001 CB750F2 (Europe-only, also known as CB750F2 Seven Fifty)
  • 2007 CB750 (Japan-only)

CB750A Hondamatic
CB750A
Also calledHondamatic
Production1976–1978[30]
Engine736.6 cc (44.95 cu in) inline-four, SOHC air-cooled
Bore / stroke61.0 mm × 63.0 mm (2.40 in × 2.48 in)
Compression ratio7.7:1
Top speed156 km/h (97 mph)[31]
Power35 kW (47 hp) @ 7500 rpm[30]
Torque5.0 kg⋅m (49 N⋅m; 36 lbf⋅ft) @ 6000 rpm[30]
Ignition typeCoil
Transmission2-speed automatic, w/torque converter, chain
BrakesFront: 296 mm (11.7 in) disc
Rear: 180 mm (7.1 in) drum
TiresFront: 3.5" x 19"
Rear: 4.5" x 17"
Rake, trail28°, 110 mm (4.5 in)
Wheelbase1,470 mm (58.0 in)
DimensionsL: 2,260 mm (89.0 in)
W: 800 mm (31.5 in)
Seat height840 mm (33.0 in)
Weight262 kg (578 lb) (claimed)[32] (dry)
259 kg (572 lb)[31] (wet)
Fuel capacity18 L (4.0 imp gal; 4.8 US gal)

In 1976, Honda introduced the CB750A to the United States, with the A suffix designating "Automatic", for its automatic transmission. Although the two-speed transmission includes a torque converter typical of an automatic transmission, the transmission does not automatically change gears for the rider. Each gear is selected by a foot-controlled hydraulic valve/selector (similar in operation to a manual transmission motorcycle).[30][33] The foot selector controls the application of high pressure oil to a single clutch pack (one clutch for each gear), causing the selected clutch (and gear) to engage. The selected gear remains selected until changed by the rider, or the kickstand is lowered (which shifts the transmission to neutral).[31]

The CB750A was sold in the North American and Japanese markets only.[33] The name Hondamatic was shared with Honda cars of the 1970s, but the motorcycle transmission was not fully automatic. The design of the transmission is similar in concept to the transmission in Honda's N360AT,[31][34] a kei car sold in Japan from 1967 to 1972.

The CB750A uses the same engine as the CB750, but detuned with lower 7.7:1 compression and smaller carburettors producing a lower output, 35.0 kW (47.0 hp). The same oil is used for the engine and transmission, and the engine was changed to a wet sump instead of dry sump type. A lockout safety device prevents the transmission from moving out of neutral if the side stand is down. There is no tachometer but the instruments include a fuel gauge and gear indicator. For 1977 the gearing was revised, and the exhaust changed to a four-into-two with a silencer on either side. Due to slow sales the model was discontinued in 1978,[30] though Honda did later introduce smaller Hondamatic motorcycles (namely the CB400A, CM400A,[35] and CM450A).[36] Cycle World tested the 1976 CB750A's top speed at 156 km/h (97 mph), with a 0 to 60 mph (0 to 97 km/h) time of 10.0 seconds and a standing 1⁄4 mile (0.40 km) time of 15.90 seconds at 138.95 km/h (86.34 mph).[31] Braking from 60 to 0 mph (97 to 0 km/h) was 39 m (129 ft).[31]

Nighthawk 750
The 1980-1983 CB750C "Custom" would become the basis for the Honda Nighthawk line of motorcycles.
1982 Honda Nighthawk 750SC

From 1982 through 2003, with the exception of several years, Honda produced a CB750 known as the Nighthawk 750. Expanding upon the niche that the 1980-1983 CB750C "Custom" had initiated, the bikes under the new "Nighthawk" line from Honda took on a 'pseudo' cruiser bike aesthetic that was specifically catered for the North American market at the time. 1982-1983 models were designated the CB750SC Nighthawk while later models were simply known as the Nighthawk 750.[37][38] The Nighthawk 750SC had a 749cc 4-stroke engine with a 5-speed manual transmission, chain drive, front disc and rear drum brakes. Because of the 1983 motorcycle tariff, the Nighthawk CB750SC was soon replaced by the smaller, yet more sporty and sophisticated CB700SC Nighthawk S.[39]

1992 Honda Nighthawk 750

The 1991-2003 Honda Nighthawk 750, released in both North America and Japan, was related to the European-only 1992-2001 CB750F2 (both being descendants of the CBX750). The Nighthawk 750 differed from the CB750F2 by taking on a more basic, budget-friendly approach with its packaging; instead of the CB750F2's dual front disc and single rear disc brake setup, the Nighthawk 750 instead made use with a single disc brake in the front and a rear drum brake. The fork rake angle on the Nighthawk 750 was slightly increased and conventional twin hydraulic shock absorbers were used instead of the CB750F2's gas-charged absorbers; the Nighthawk's foot rest were welded to the frame, rather than being interchangeable like on the CB750F2 and the styling for the Nighthawk was given a more 'retro', smoother reworking that was reminiscent of the 1982-1983 CB750SC. The engine, exhaust, transmission and gauges were the same on both bikes but ultimately the Nighthawk 750's more basic layout contributed to a $3995 price tag when launched in 1991 which, along with its versatility, sensible performance and ease of maintenance made it popular with intermediate riders and commuters throughout the 1990s and 2000s.[40]

2001 Honda CB750F2

The entry-level 1992-2008 Nighthawk 250 was derived from the Nighthawk 750.

For 2004, the CBR-based Honda Hornet CB600F became the eventual successor to the CB750 line in North America after the Nighthawk 750 was discontinued in 2003, concurrent with other Japanese manufacturers at the time shifting away from traditional, utilitarian standard motorcycles and transitioning towards supersport derived naked bikes.

2007 CB750
2007 Honda CB750 Special

In 2007 Honda Japan announced the sale of a new CB750 very similar to the models sold in the 1970s. Announced as the CB750 Special Edition that was in the silver colours of the CB750 AMA racer of the 1970s and the CB750, it was offered in three colour schemes reminiscent of CB750s previously sold. As of August 2007, these bikes were intended only for release in Japan.[41]

Specifications
Model Engine displacement Fuel system Cam Valves per cylinder Power Torque Weight Drive
1969–1978 CB750 Four[42][43] 736 cc (44.9 cu in)[43] 4 carburettors[43] SOHC[43] 2 67 bhp (50 kW) @ 8000 rpm[11][43][44] 59.8 N⋅m (44.1 lbf⋅ft) @ 7000 rpm[43] 218 kg (481 lb) (dry)[43] 5-Speed, Constant Mesh, Gearbox, Final Drive Chain[43]
1976–1978 CB750A[32] 736 cc (44.9 cu in) 4 carburettors SOHC 2 35 kW (47 hp) @ 7500 rpm[30] 262 kg (578 lb) (claimed dry)[32]
259 kg (572 lb) (wet) [31]		 2-speed w/torque converter, chain[30]
1978 CB750K[45] 748 cc (45.6 cu in) 4 carburettors DOHC 4 50 kW (67 hp) @ 9000 rpm 231 kg (509 lb) (dry) 5-Speed, Constant Mesh, Gearbox, Final Drive Chain
1979–1980 CB750F (RC04)[46] 748 cc (45.6 cu in) 4 carburettors[46] DOHC[46] 4 50 kW (67 hp) @ 9000 rpm[46] 42.6 lb⋅ft (57.8 N⋅m) @ 8000 rpm[46] 228 kg (503 lb) Dry[46] 5-Speed, Constant Mesh, Gearbox, Final Drive Chain[46]
1980–1982 CB750C Custom[47] 748 cc (45.6 cu in) 4 carburettors[47] DOHC[47] 4 50 kW (67 hp) @ 9000 rpm[47] 42.6 lb⋅ft (57.8 N⋅m) @ 8000 rpm[47] 236 kg (520 lb) dry
[47] ~252 kg (556 lb) wet[47]		 5-Speed, Constant Mesh, Gearbox, Final Drive Chain[47]
1981 CB750F 748 cc (45.6 cu in) 4 carburettors DOHC 4 50 kW (67 hp) 42.6 lb⋅ft (57.8 N⋅m) @ 8000 rpm 243 kg (536 lb) Chain
1982–1983 CB750SC (Nighthawk) 749 cc (45.7 cu in) 4 carburettors DOHC 4 49.64 kW (66.57 hp) @ 9000 rpm 41.54 lbf⋅ft (56.32 N⋅m) @ 7500 rpm 260.1 kg (573.5 lb) wet 5-Speed, Chain[48][49] See also Honda CB700SC
1991–1993, 1995–2003 CB750 (Nighthawk) 747 cc (45.6 cu in) 4 Keihin 34 mm Constant Vacuum carburettors DOHC 4 56 kW (75 hp) @ 8500 rpm 64 N⋅m (47 lbf⋅ft) @ 7500 rpm 210 kg (463 lb) Chain
2007 CB750 747 cc (45.6 cu in) VENAC DOHC 4 55 kW (74 hp) @ 8500 rpm[50] 64 N⋅m (47 lbf⋅ft) @ 7500 rpm[50] 240 kg (520 lb)[50] Chain

References
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