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Honda CB750K


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Honda CB750K
1969 Honda CB750K0 in Blue
Manufacturer Honda
Production 69-82
Engine 750cc
Top speed 124 mph [1]
Sparkplug D8EA '69-82
Battery YB14L-A2 '79-82
12N14-3A '69-78
Front Tire '69-76
3.50-19 '77-82
Rear Tire '79
4.50-17 '77-78 , '80-82
4.00-18 '69-76
Weight 517 lbs [2]
Related Honda CB750F
Competition Kawasaki H2
Kawasaki Z1
Yamaha XS750
Triumph Trident
Suzuki GT750
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The Honda CB750K was a 750cc, four stroke, four cylinder, street motorcycle manufactured by Honda from 1968 through 1982. The model is included in the AMA Hall of Fame Classic Bikes,[3][4] the Discovery Channel's "Greatest Motorbikes Ever"[5]

Contents

History

In June of 1968, Honda dropped the gauntlet that would forever change the world of motorcycling. The CB750 "Four" offered a combination of features never before seen on a single motorcycle. No longer would Honda be known as scooter company.


At the heart of the CB750K was an inline four-cylinder engine with a single overhead cam, four carburetors, four-into-four exhaust pipes. It produced 67 horsepower at 8000 rpm which was 15-percent more power than BSA's new 750 cc Rocket 3 even though they weighed about the same (just under 227 kg (500 pounds)). The Honda, obviously, was much faster.

It was not just the four-cylinder engine that caused such a stir; though most contemporary competitors had twin cylinders, fours had been offered by several manufacturers in the past. Rather, it was the fact that the four-cylinder power and smoothness was joined by a five-speed transmission, electric starter, a front disc brake, and a nearly bullet proof design—the first ever on a street bike—all at a reasonable price.

The single cam version was produced without much refinement until 1978 when it was replaced with a long awaited, more modern, double cam model.

Honda also sold a race kit to convert the CB750 into a Honda CR750 race ready bike.

In 1975 Honda introduced the "F" or "SuperSport" model which had a rear disc brake and a 4 into 1 header as well as some other cafe inspired additions. The same year they also introduced the "A" or "HondaMatic" model which was a clutchless 2-speed model with a wet sump lubrication system.

Honda also produced smaller fours in 350,400,500,550 and 650 displacements.

Earlier CB750s were produced with sand-cast cases that had a rough finish, later models had smoother castings. Those early sand-cast models have become the most valuable to collectors.

By 1970, Dick Mann piloted a race-prepped CB750 into the winner's circle at the Daytona 200 and the world of spurring aftermarket upgrades to the CB750. The CB750 is also credited with casting the mold for what would later be called the "Universal Japanese motorycle‎", a breed of machines that would bring the Motorcycle manufacturers of England to their collective knees.

Under development for one year, when finally introduced to the market, The CB750 offered two unprecedented features: its disc brake and its inline four cylinder engine -- neither of which were previously available on mainstream, affordable, production bikes. These two features, along with the bike's introductory price of $1495.00 (US), gave the CB750 considerable advantage over its competition, particularly its British rivals.

Cycle Magazine called the CB750 "the most sophisticated production bike ever" upon its introduction. Cycle World called the motorcycle a masterpiece, highlighting Honda's painstaking durability testing, the bike's 120mph top speed, the fade-free performance of the braking, the comfortable ride, and excellent instrumentation .

As the first modern four cylinder machine from a mainstream manufacturer, the term Superbike was coined to describe the CB750. The bike offered other important features, both great and small that added to its compelling value: electric starter, kill switch, dual mirrors, flashing turn signals, screw on oil filter, maintenance free valves and overall smoothness and freedom from vibration both underway and at a standstill. On the other hand, the bike was difficult to get on its center stand and tended to throw chain oil on its muffler.

Unable to accurately gauge demand for the new bike, Honda limited its initial investment in the production dies for the CB750 by originally using a technique called permanent mold casting (often erroneously referred to as sand casting) rather than die-casting for the engines -- unsure of the bike's reception. The bike remained in the Honda lineup for ten years, sales totaling over 400,000 copies in its life span

The CB750 is sometimes referred to as a Universal Japanese Motorcycle or UJM, although certainly the bike has earned notoriety of its own. The Discovery Channel ranked the Honda CB750 among the top ten greatest motorbikes of all time, giving the CB750 third place.

Models - SOHC

The single overhead cam models were produced from 1969 through 1978.

  • 1969 CB750K or CB750K0
  • 1971 CB750K1
  • 1972 CB750K2
  • 1973 CB750K3 (US-only, K2 elsewhere)
  • 1974 CB750K4 (US/Japan-only, K2 elsewhere)
  • 1975 CB750K5 (US-only, K2/K4 elsewhere), CB750F
  • 1976 CB750K6, CB750F1, CB750A
  • 1977 CB750K7, CB750F2, CB750A1
  • 1978 CB750K8 (US-only), CB750F3, CB750A2

DOHC

  • 1979-1982 CB750K
  • 1979 CB750L 10th Anniversary Edition
  • 1979-1981 CB750F
  • 1982 CB750SC Nighthawk
  • 1991-2003 CB750 Nighthawk

Nighthawk 750

From 1991 through 2003, Honda produced a CB750 known as the Nighthawk 750. It is a more utilitarian machine, a useful and reliable model, notable for its low maintenance needs.

As sport-bikes and cruisers began to dominate the motorcycle marketplace in recent years, the Nighthawk was Honda's attempt to recapture the middle of the market with a "standard" or UJM (Universal Japanese Motorcycle) design. The bike never sold to its maker's lofty expectations.

2007 CB 750

In 2007, Honda Japan announced the sale of a new CB 750 very similar to the models sold in the 1970s. Announced were the CB 750 Special Edition (list price 798,000 yen) which is in the silver colors of the CB 750 AMA racer of the 1970s, and the CB 750 (list price 730,000 yen) in 3 color schemes reminiscent of CB 750s sold previously. As of August 2007, these bikes have only been announced for the Japan domestic market.

CB750 Videos

1969 to 1970

1969 Honda CB750K in Red
Honda CB750K
Honda CB750K
1969 Honda CB750K0
1970 Honda CB750K0 "Four" in Candy Gold
1970 Honda CB750K0 "Four" in Candy Gold
1970 Honda CB750K0 "Four" in Candy Gold
1970 Honda CB750K0 "Four" in Candy Gold
1970 Honda CB750K0 "Four" in Candy Gold
1970 Honda CB750K0 (diecast) in Red
1970 Honda CB750K0 (diecast) in Red
1970 Honda CB750K0 (diecast) in Red
1970 Honda CB750K0 (diecast) in Red
1970 Honda CB750K0 (diecast) in Red
1970 Honda CB750K0 (diecast) in Red
1970 Honda CB750K0 (diecast) in Red
1970 Honda CB750K0 (diecast) in Red
1970 Honda CB750K0 (diecast) in Red


The CB750K0 Four was sold from 1969 to 1970 and was available in one of three colors: Candy Blue Green, Candy Gold, or Candy Ruby Red. The tank, side covers, and upper forks were of the basic color (green, gold, or red). The headlight shell was also the basic color. The bike had a 4-into-4 throttle cable system. The exhaust system was a 4-into-4. The engine was a 736cc SOHC 2-valve dry sump inline 4 cylinder linked to a 5-speed transmission and chain drive.

  • Serial Number
    • Frame: CB750-1000001
    • Engine: CB750E-1000001

1970 to 1971

1971 Honda CB750 in Candy Garnet Brown
1971 Honda CB750 in Candy Garnet Brown
1971 Honda CB750 in Candy Garnet Brown
1971 Honda CB750 in Candy Garnet Brown
1971 Honda CB750 in Candy Garnet Brown
Honda CB750K
Honda CB750K
1971 Honda CB750K1 in Candy Gold
1971 Honda CB750K1 in Candy Gold
1971 Honda CB750K1 in Candy Gold
1971 Honda CB750K1 in Candy Gold
1971 Honda CB750K1 in Candy Gold
1971 Honda CB750K1 in Candy Gold
1971 Honda CB750K1 in Candy Gold
1971 Honda CB750K1 in Candy Gold
1971 Honda CB750K1 in Candy Gold
1971 Honda CB750K1 in Candy Gold



The CB750K1 Four was sold from 1970-71 and was available in one of four colors: Candy Ruby Red, Candy Gold, Valley Green Metallic, or Candy Garnet Brown. The gas tank stripe was gold. The tank, side covers, and upper forks were of the basic color (red, gold, green, or brown). The side covers were smaller and there were no slots on the leading edge. There was a two-throttle cable system (pull open and pull closed). The headlight shell was also the basic color. The exhaust system was a 4-into-4. The engine was a 736cc SOHC 2-valve dry sump inline 4 cylinder linked to a 5-speed transmission and chain drive. Honda CB750K1 Wiring diagram

  • Serial Number
    • Frame: CB750-1044650
    • Engine: CB750E-1044806

1972

1972 Honda CB750K
1972 Honda CB750 Four in Brier Brown Metallic
1972 Honda CB750 Four in Brier Brown Metallic
1972 Honda CB750 Four in Brier Brown Metallic
1972 Honda CB750 Four in Brier Brown Metallic
1972 Honda CB750 Four in Brier Brown Metallic
1972 Honda CB750 Four in Brier Brown Metallic


The CB750K2 Four was sold in 1972 and was available in one of three colors: Brier Brown Metallic, Flake sunrise Orange, or Candy Gold. The gas tank stripe was gold but as with previous models, the Gold tanks had a black stripe. The side covers were smaller than the K0 model and there were no slots on the leading edge. The upper forks were chrome. The headlight shell was black. The taillight and side reflectors were larger. There was a two-throttle cable system (pull open and pull closed). The exhaust system was a 4-into-4. The engine was a 736cc SOHC 2-valve dry sump inline 4 cylinder linked to a 5-speed transmission and chain drive.

  • Serial Number
    • Frame: CB750-2000001
    • Engine: CB750E-2000001

1973

1973 Honda CB750K
1973 Honda CB750K3 in Brown
1973 Honda CB750K3 in Brown
1973 Honda CB750K3 in Brown
1973 Honda CB750K3 in Brown


The CB750K3 Four was sold in 1973 and was available in one of three colors: Flake Sunrise Orange, Candy Bucchus Olive, or Maxim Brown Metallic. The gas tank stripes were white, gold and black. The side covers were smaller than the K0 model and there were no slots on the leading edge. The upper forks were chrome. The headlight shell was black. The taillight and side reflectors were larger than the K1 model. There was a two-throttle cable system (pull open and pull closed). The exhaust system was a 4-into-4. The engine was a 736cc SOHC 2-valve dry sump inline 4 cylinder linked to a 5-speed transmission and chain drive.

  • Serial Number
    • Frame: CB750-2200001
    • Engine: CB750E-2200001

1974

1974 Honda CB750K


The CB750K4 Four was sold in 1974 and was available in one of three colors: Flake Sunrise Orange, Freedom Green Metallic, or Boss Maroon Metallic. The gas tank stripes were white, gold and black. The side covers were smaller than the K0 model and there were no slots on the leading edge. The speedometer showed increments of 20 (i.e., 20, 40, 60, 80, etc.). The upper forks were chrome. The white tank pinstripe was wider than the K3 model. The headlight shell was black. The taillight and side reflectors were larger than the K1 model. There was a two-throttle cable system (pull open and pull closed). The exhaust system was a 4-into-4. The engine was a 736cc SOHC 2-valve dry sump inline 4 cylinder linked to a 5-speed transmission and chain drive.

  • Serial Number
    • Frame: CB750-2300001
    • Engine: CB750E-2300001

1975

1975 Honda CB750K
1975 Honda CB750K5 in Planet Blue Metallic
1975 Honda CB750K5 in Planet Blue Metallic
1975 Honda CB750K5 in Planet Blue Metallic
1975 Honda CB750K5 in Planet Blue Metallic


The CB750K5 Four was sold in 1975 and was available in one of two colors: Planet Blue Metallic or Flake Apricot Red. The instrument faces were dark green. The speedometer numbers were increments of 10 (i.e., 10, 20, 30, 40, etc.). The side covers were smaller than the K0 model and there were no slots on the leading edge. The upper forks were chrome. The white tank pinstripe was wider than the K3 model. The headlight shell was black. The taillight and side reflectors were larger than the K1 model. There was a two-throttle cable system (pull open and pull closed). The exhaust system was a 4-into-4. The engine was a 736cc SOHC 2-valve dry sump inline 4 cylinder linked to a 5-speed transmission and chain drive.

  • Serial Number
    • Frame: CB750-2500001
    • Engine: CB750E-2372115

1976

1976 Honda CB750K
1976 Honda CB750K in Candy Antares Red
1976 Honda CB750K in Candy Antares Red
1976 Honda CB750K in Candy Antares Red
1976 Honda CB750K6 in Candy Antares Red
1976 Honda CB750K6 in Candy Antares Red
1976 Honda CB750K6 in Candy Antares Red
1976 Honda CB750K6 in Candy Antares Red
1976 Honda CB750K6 in Candy Antares Red
1976 Honda CB750K6 in Candy Antares Red
1976 Honda CB750K6 in Candy Antares Red
1976 Honda CB750K6 in Candy Antares Red
1976 Honda CB750K6 in Candy Antares Red


The CB750K'76 Four was sold in 1976 and was available in one color: Candy Antares Red. The instrument faces were light green. The side covers were smaller than the K0 model and there were no slots on the leading edge. The upper forks were chrome. The white tank pinstripe was wider than the K3 model. The headlight shell was black. The taillight and side reflectors were larger than the K1 model. There was a two-throttle cable system (pull open and pull closed). The exhaust system was a 4-into-4. The engine was a 736cc SOHC 2-valve dry sump inline 4 cylinder linked to a 5-speed transmission and chain drive.

  • Serial Number
    • Frame: CB750-2540001
    • Engine: CB750E-2428762

1977


The CB750K'77 Four K was sold in 1977 and was available in one of two colors: Candy Alpha Red or Excel Black. The gas tank stripe was gold with a white and red pinstripe. The "750 FOUR K" side cover emblem was gold. There was a two-throttle cable system (pull open and pull closed). The exhaust system was a 4-into-4. The engine was a 736cc SOHC 2-valve dry sump inline 4 cylinder linked to a 5-speed transmission and chain drive.

  • Serial Number
    • Frame: CB750-2700009
    • Engine: CB750E-2700001

1978

1978 Honda CB750K
1978 Honda CB750K in Excel Black
1978 Honda CB750K in Excel Black
1978 Honda CB750K in Excel Black
1978 Honda CB750K in Excel Black
1978 Honda CB750K in Excel Black
1978 Honda CB750K in Excel Black
1978 Honda CB750K in Excel Black
1978 Honda CB750K in Excel Black
78_750K_ 2.JPG
78_750K.JPG


The CB750K'78 Four K was sold in 1978 and was available in one of two colors: Purple or Excel Black. The gas tank stripe was gold with a gold and red pinstripe. The "750 FOUR" side cover emblem was a graphic design. There was a "K" side cover decal and stripe. The seat is contoured in a two-stage design. There was a two-throttle cable system (pull open and pull closed). The exhaust system was a 4-into-4. A locking lid covered the gas cap. The exhaust pipes (HM405) were without the black trim covers. The engine was a 736cc SOHC 2-valve dry sump inline 4 cylinder linked to a 5-speed transmission and chain drive.

  • Serial Number
    • Frame: CB750-2800001
    • Engine: CB750E-3000001

1979

1979 Honda CB750K


The CB750K'79 Four K was sold in 1979 and was available in one of three colors: Candy Muse Red, Candy Bayard Brown, or Black. The taillight lens was a wraparound unit with a painted cowling. The exhaust system was a 4-into-4. The speedometer had a 150 mph (240 kph) limit. The engine was a 749cc DOHC 4-valve inline four cylinder linked to a 5-speed transmission.

  • Serial Number
    • Frame: RC01-2000001
    • Engine: RC01E-2000001

Limited

1979 Honda CB750K Limited


The CB750K'79 Limited Edition was sold in 1979 and was available in one color scheme: Candy Muse Red with Red. The gas tank and side covers were 2-tone. The wheels were black comstar. There was a separate taillight assembly with the 1978 style lens. The "10th ANNIVERSARY CB750K" side cover emblem was gold and green. The engine was a 749cc DOHC 4-valve inline four cylinder linked to a 5-speed transmission.

  • Serial Number
    • Frame: RC01-3000006
    • Engine: RC01E-3000001

1980

1980 Honda CB750K
1980 Honda CB750K in Excel Black
1980 Honda CB750K in Excel Black
1980 Honda CB750K in Excel Black
1980 Honda CB750K in Excel Black
1980 Honda CB750K in Excel Black
1980 Honda CB750K in Excel Black
1980 Honda CB750K in Excel Black
HondaCB750K003
HondaCB750K002

HondaCB750K001
HondaCB750K005


The CB750K'80 Four K was sold in 1980 and was available in one of two colors: Candy Muse Red or Excel Black. There was a separate taillight assembly with a chrome bracket. The speedometer had a 85 mph (135 kph) limit. The engine was a 749cc DOHC 4-valve inline four cylinder linked to a 5-speed transmission.

  • Serial Number
    • Frame: RC01-2100005
    • Engine: RC01E-2100005

1981

1981 Honda CB750K


The CB750K'81 Four K was sold in 1981 and was available in one of two colors: Candy Muse Red or Cosmo Black Metallic. The speedometer had a 85 mph (135 kph) limit. The 4-into-4 mufflers had a new megaphone design. The front forks were air-adjustable. The engine was a 749cc DOHC 4-valve inline four cylinder linked to a 5-speed transmission.

  • Serial Number
    • Frame: JH2RC010*BM200001
    • Engine: RC01E-2200020

1981 Honda Motorcycle Full-Line Brochure

1982

1982 Honda CB750K


The CB750K'82 Four K was sold in 1982 and was available in one color: Candy Imperial Blue. The speedometer had a 85 mph (135 kph) limit. The front forks were air-adjustable. The front disc brakes were slotted with twin piston calipers. The 4-into-4 mufflers had a megaphone design. The engine was a 749cc DOHC 4-valve inline four cylinder linked to a 5-speed transmission.

  • Serial Number
    • Frame: JH2RC010*CM300003
    • Engine: RC01E-2300003

See Also

References


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