History
The CB750 was an historic motorcycle often recognized as the most important motorcycle of the 20th Century. From this revolutionary bike, Honda developed a complete line of reliable four cylinder motorcycles to become the largest motorcycle company in the world and usher in an era of Japanese dominance in the industry.
The CB750 was available in several variations, the CB750K which retained the classic four-into-four pipes and styling of the original 1969 model. The CB750F which adopted the four-into-one pipes and cafe racer stylings popularized by the CB400F. And the CB750A, mating the 750 engine to an automatic gearbox.
The CB750 had a production run of 9 years during which a total of, roughly, 553,400 motorcycles were made. The K1 was the most popular single model with sales figures of about 77,000. The second most popular model, the K2, also sold in large numbers, a total of 63,500, due primarily to the fact that this model was in production until 1976 in all markets except the US and Japan.
The first 7,414 bikes produced had sandcast engines. The identification of these models, which are in great demand amongst collectors, is a bit of a science and is covered in
this section of the site.
Model Changes
| Year |
Model Changes |
| 1969 |
This is the original version of the CB750. Notable differences from later models include louvered side panels, all-cable throttles, plastic instrument lenses and a duck-tail (humped) seat. The first 7400 or so bikes had ‘sand-cast’ crankcases. |
| 1971 |
Beam-operated throttles; re-styled airbox and oil tank with new emblems; white tank lettering; black front caliper. |
| 1972 |
K2 with restricted silencers; altered rear shocks; metal chainguard; warning light panel between the instruments. |
| 1973 |
K3 introduced in the US; K2 continues elsewhere. Improved front forks and five-way adjustable shocks. The K3 had new tank graphics, restricted air intake, front disc water guard, and running lights in the indicators. |
| 1974 |
K4 for the US and Japan; K2 elsewhere. Only 3 vertical braces in cylinder head side fins. The K4 added a ratio indicator on the gearbox. |
| 1975 |
K5 for the US; K2/K4 elsewhere. The K5 got bigger indicators and a rubber-tipped flip-up side stand. |
| 1976 |
K6 with stronger swing-arm; detuned engine; no chain oiler. |
| 1977 |
K7 with F1-style engine and single carburettor accelerator pump; plainer silencers; 17 inch rear wheel with wider tire; O-ring chain; flush fuel filler. |
| 1978 |
K8 for the US with two-tier seat; minor engine changes. |
Serial Numbers
|
 |
| The frame serial number (fig 1.1) is stamped on the left side of the steering head pipe and the engine serial number (fig 1.2) is located on the top of the crankcase left side. The serial numbers do not match, but are in the same model series. It is not uncommon to find CB750’s which have a replacement engine from a different model year since engines from all of the CB750K models are compatible with all of the frames. |
| Model |
Year |
Production Dates |
Number Sold |
Engine# |
Frame# |
| CB750 Sandcast |
1969/70 |
1969 – 1970 |
7,414 |
1000001-1007414 |
1000001 |
| CB750 K0 |
1970 |
1970 |
53,400 |
1007414 |
1000001-1044649 |
| CB750 K1 |
1971 |
08/70 – 11/71 |
77,000 |
1044806 |
1044650 |
| CB750 K2 |
1972 |
11/71 – 09/72 |
63,500 |
2000001 |
2000001 |
| CB750 K3 |
1973 |
09/72 – 06/73 |
38,000 |
2200001 |
2200001 |
| CB750 K4 |
1974 |
06/73 – 05/74 |
60,000 |
2300001 |
2300001 |
| CB750 K5 |
1975 |
05/74 – 12/74 |
35,000 |
2372115 |
2500001 |
| CB750 K6 |
1976 |
12/74 – 06/76 |
42,000 |
|
|
| US |
|
|
|
2428762–2465510 |
2540001–2575894 |
| Canada |
|
|
|
2428762–2465992 |
2540001–2576394 |
| European Direct |
|
|
|
2438827–2475324 |
2556099–2584973 |
| France |
|
|
|
2438827–2474663 |
2555545–2584393 |
| Germany |
|
|
|
2438827–2476626 |
2550437–2586393 |
| England |
|
|
|
2438827–2475216 |
2573735–2584843 |
| General Export KPH |
|
|
|
2438827–2476422 |
2573735–2584843 |
| Australia |
|
|
|
2438827–2476604 |
2578674–2586269 |
| CB750 K7 |
1977 |
06/76 – 05/77 |
38,000 |
|
|
| US |
|
|
|
2700009–2729740 |
2700009–2729532 |
| Canada |
|
|
|
2709652–2728188 |
2709636–2728111 |
| General Export KPH |
|
|
|
2720001–2740319 |
2719942–2739004 |
| General Export MPH |
|
|
|
2732065–2732824 |
2731270–2732029 |
| England |
|
|
|
2719995–2736452 |
2719935–2735472 |
| European Direct |
|
|
|
2720004–2740102 |
2719941–2738818 |
| France |
|
|
|
2719999–2738337 |
2719939–2737053 |
| Germany |
|
|
|
2719997–2737988 |
2719937–2736904 |
| Australia |
|
|
|
2720003–2740319 |
2719944–2739038 |
| CB750 K8 |
1978 |
05/77 – 05/78 |
36,000 |
|
|
| USA |
|
|
|
3000001–3062980 |
2800001–2862980 |
| Canada |
|
|
|
3001934–3061938 |
2801946–2861935 |
CB750K0
Model Guide
The K0 was available in three colors, Candy Gold, Candy Ruby Red, and Candy Blue Green. The tank, side covers, fork uppers and headlight shell were painted the same color as the tank. The most distinctive mechanical feather are a throttle linkage which used separate cables to each carb.
| Engine # |
Changes |
| 1000140 |
Bolt at the final drive changed from M8x80 to M10x82 |
| 1000220 |
New lower case, engine case only available as set |
| 1000425 |
Transmission changed for better shifting |
| 1001081 |
New crankshaft |
| 1001760 |
7 instead of 8 clutch disks |
| 1003528 |
New final drive shaft and sprocket |
| 1005307 |
Revised right bearing of main tranny shaft |
| 1007220 |
New lower case, deeper oil pan |
| 1007415 |
Introduction of circular opening in lower case |
| 1007500 |
End of sandcast engines |
| 1009554 |
Finned oil filter casing |
| 1010336 |
Additional oil passages, new rocker shafts and valve cover |
| 1014996 |
Revised exhaust valve guides & valve guide seals |
| 1026144 |
new cylinder head, cylinder block: new central M6 bolt, cyl. block w/8 rubbers. Case with guard to prevent damages from broken drive chains. New sprocket cover, new shift mechanism |
| 1042806 |
Weaker clutch springs |
Specifications
| Item |
English |
Metric |
| Dimensions |
|
|
| Overall length |
85.0 in. |
2,160 mm |
| Overall width |
34.8 in. |
885 mm |
| Overall height |
45.5 in. |
1,155 mm |
| Wheel base |
57.3 in |
1,455 mm |
| Seat height |
31.5 in. |
800 mm |
| Foot Peg Height |
12.2 in. |
310 mm |
| Ground Clearance |
5.5 in. |
160 mm |
| Curb weight |
517.3 lb |
235 kg |
| Weight distribution L/R |
271.1/209.5 lb |
123/205 kg |
| Frame & Suspension |
|
|
| Type |
Double cradle tubular steel |
|
| Front |
|
|
| Fork travel |
5.6 in. |
143mm |
| Caster Angle |
63º |
|
| Trail length |
3.74 in. |
95mm |
| Oil capacity (dry) |
7.5-7.8 oz |
220-230 cc |
| Oil capacity (full) |
6.9-7.1 oz |
200-210 cc |
| Rear Swing arm, travel |
3.3 in. |
85mm |
| Front Tire |
3.25-19 (4PR) Rib tire |
|
| Rear Tire |
4.00-18 (4 PR) Block tire |
|
| Brakes |
|
|
| Front Type |
Disk |
|
| Front lining swept area |
59.3 sq in |
382.9 sq cm |
| Rear Type |
Internal expanding shoe |
|
| Rear lining swept area |
34.2 sq in |
220.5 sq cm |
| Fuel |
|
|
| Tank Capacity |
4.7 US gal, 3.9 Imp gal |
18 liter |
| Reserve Capacity |
1.3 US gal, 1.1 Imp. gal |
5 liter |
| Carburetor |
|
|
| Type |
Venturi Diaphram, 4x28mm Keihin, slide type |
|
| Air screw opening |
1 1/8 turn |
|
| Idle speed |
900 rpm |
|
| Main jet |
#120 |
|
| Idle jet |
#40 |
|
| Air jet |
#100 |
|
| Carb main bore |
1.102in. |
28mm |
| Engine |
|
|
| Type |
Air-cooled, 4-stroke, O.H.C. engine |
|
| Cylinder Arrangement |
4-cylinder in line |
|
| Bore and Stroke |
2.402x2.480 in. |
61x63 mm |
| Displacement |
44.9135 cu in |
736 cc |
| Compression Ratio |
9.0:1 |
|
| Cylinder head compression |
170.7 psi |
12 kg/cm sq |
| Maximum Horsepower |
67 BHP@8,000 rpm |
|
| Maximum Torque |
44.12 lb-ft@7,000 rpm |
6.1 kg-m@7,000 rpm |
| Valve train |
Chain driven overhead camshaft |
|
| Oil Capacity |
3.7 US qt, 3.1 Imp. qt |
3.5 liter |
| Oil Tank Capacity |
2.1 US qt., 1.8 Imp. qt |
2 liter |
| Lubrication System |
Forced pressure and dry sump |
|
| Air filtration |
Paper element |
|
| Valve Timing |
|
|
| Intake Valve Open |
At 5º before top dead center |
|
| Intake Valve Close |
At 30º after bottom dead center |
|
| Exhaust Valve Open |
At 35º before bottom dead center |
|
| Exhaust Valve Close |
At 5º after top dead center |
|
| Valve Tappet Clearance |
|
|
| Intake |
0.002in. |
0.05mm |
| Exhaust |
0.003in. |
0.08mm |
| Engine weight (Wet) |
176.3 lb |
80 kg |
| Drive Train |
|
|
| Clutch |
Wet, multi-plate |
|
| Transmission Type |
5-speed, constant mesh |
|
| Gear Ratio I |
2.500:1 |
|
| Gear Ratio II |
1.708:1 |
|
| Gear Ratio III |
1.333:1 |
|
| Gear Ratio IV |
1.097:1 |
|
| Gear Ratio V |
0.939:1 |
|
| Primary reduction |
1.708:1 |
|
| Secondary reduction |
1.167:1 |
|
| Final Reduction |
2.667:1 (18T x 48T) |
|
| Electrical |
|
|
| Type |
12v, negative earth |
|
| Ignition |
Coil and contact breaker, spare spark |
|
| Starting system |
Electrical motor and kick pedal |
|
| Alternator |
Three phase A.C. generator 12V/0.21kW@5,000 rpm |
|
| Battery Capacity |
12V - 14 amp hour |
|
| Spark plug type |
NGK D-8ES |
|
| Spark plug gap |
0.024 ~ 0.028 in. |
0.6 ~ 0.7 mm |
| Point gap |
0.012 ~ 0.016 in. |
0.3 ~ 0.4 mm |
CB750K1
Model Guide
The CB750K1 was sold in four different color schemes, Candy Gold, Candy Ruby Red, Candy Garnet Brown, and Valley Green Metallic. This model featured a single paint color for the tank, side covers, fork uppers and headlight shell. The side covers were smaller than the K0 without slots on the leading edge. The throttle linkage changed to a cable-controlled shaft joining the four carbs together.
| Engine # |
Changes |
| 1044805 |
New case, final drive 18/48 i/o 16/45 or 17/45, chain oiler |
| 1044812 |
Carburetors linked instead of individual cables |
| 1044968 |
Improved neutral position |
| 1056080 |
New clutch basket |
| 1064903 |
Introduction of special washerless bolts |
| 1068376 |
Clamp for scavange hoses |
| 1071336 |
Fuel hoses 5.5mm dia. instead of 5.0mm |
| 1113723 |
Grooves in gear shift drum changed from 0.5mm to 1mm for 4th |
| and 5th gear |
|
| 1114461 |
New head gasket |
Specifications
| Item |
English |
Metric |
| Dimensions |
|
|
| Overall length |
85.0 in. |
2,160 mm |
| Overall width |
34.8 in. |
885 mm |
| Overall height |
45.5 in. |
1,155 mm |
| Wheel base |
57.3 in |
1,455 mm |
| Seat height |
31.5 in. |
800 mm |
| Foot Peg Height |
12.2 in. |
310 mm |
| Ground Clearance |
5.5 in. |
160 mm |
| Curb weight (dry) |
479 lb |
218 kg |
| Weight distribution L/R |
271.1/209.5 lb |
123/205 kg |
| Frame & Suspension |
|
|
| Type |
Double cradle tubular steel |
|
| Front |
|
|
| Fork travel |
5.6 in. |
143mm |
| Caster Angle |
63º |
|
| Trail length |
3.74 in. |
95mm |
| Oil capacity (dry) |
7.5-7.8 oz |
220-230 cc |
| Oil capacity (full) |
6.9-7.1 oz |
200-210 cc |
| Rear Swing arm, travel |
3.3 in. |
85mm |
| Front Tire |
3.25-19 (4PR) Rib tire, 28psi |
|
| Rear Tire |
4.00-18 (4 PR) Block tire, 28psi |
|
| Brakes |
|
|
| Front Type |
Disk |
|
| Front lining swept area |
59.3 sq in |
382.9 sq cm |
| Rear Type |
Internal expanding shoe |
|
| Rear lining swept area |
34.2 sq in |
220.5 sq cm |
| Fuel |
|
|
| Tank Capacity |
4.5 US gal, 3.7 Imp. gal |
17 liter |
| Reserve Capacity |
1.3 US gal, 1.1 Imp. gal |
5 liter |
| Carburetor |
|
|
| Type |
Piston Valve, Keihin, slide type |
|
| Setting mark |
7A |
|
| Air screw opening |
1 3/8 turns |
|
| Idle speed |
950 rpm |
|
| Main jet |
#120 |
|
| Idle jet |
#40 |
|
| Float height |
0.866 in. |
26mm |
| Engine |
|
|
| Type |
Air-cooled, 4-stroke, O.H.C. engine |
|
| Cylinder Arrangement |
4-cylinder in line |
|
| Bore and Stroke |
2.402x2.480 in. |
61x63 mm |
| Displacement |
44.9135 cu in |
736 cc |
| Compression Ratio |
9.0:1 |
|
| Cylinder head compression |
170.7 psi |
12 kg/cm sq |
| Maximum Horsepower |
67 BHP@8,000 rpm |
|
| Maximum Torque |
44.12 lb-ft@7,000 rpm |
6.1 kg-m@7,000 rpm |
| Valve train |
Chain driven overhead camshaft |
|
| Oil Capacity |
3.7 US qt, 3.1 Imp. qt |
3.5 liter |
| Oil Tank Capacity |
2.1 US qt., 1.8 Imp. qt |
2 liter |
| Lubrication System |
Forced pressure and dry sump |
|
| Air filtration |
Paper element |
|
| Valve Timing |
|
|
| Intake Valve Open |
At 5º before top dead center |
|
| Intake Valve Close |
At 30º after bottom dead center |
|
| Exhaust Valve Open |
At 35º before bottom dead center |
|
| Exhaust Valve Close |
At 5º after top dead center |
|
| Valve Tappet Clearance |
|
|
| Intake |
0.002in. |
0.05mm |
| Exhaust |
0.003in. |
0.08mm |
| Engine weight (Wet) |
176.3 lb |
80 kg |
| Drive Train |
|
|
| Clutch |
Wet, multi-plate |
|
| Transmission Type |
5-speed, constant mesh |
|
| Gear Ratio I |
2.500:1 |
|
| Gear Ratio II |
1.708:1 |
|
| Gear Ratio III |
1.333:1 |
|
| Gear Ratio IV |
1.097:1 |
|
| Gear Ratio V |
0.939:1 |
|
| Primary reduction |
1.708:1 |
|
| Secondary reduction |
1.167:1 |
|
| Final Reduction |
2.667:1 (18T x 48T) |
|
| Electrical |
|
|
| Type |
12v, negative earth |
|
| Ignition |
Coil and contact breaker, spare spark |
|
| Starting system |
Electrical motor and kick pedal |
|
| Alternator |
Three phase A.C. generator 12V/0.21kW@5,000 rpm |
|
| Battery Capacity |
12V - 14 amp hour |
|
| Spark plug type |
NGK D8ES-L, NDX 24ES |
|
| Spark plug gap |
0.024 ~ 0.028 in. |
0.6 ~ 0.7 mm |
| Point gap |
0.012 ~ 0.016 in. |
0.3 ~ 0.4 mm |
| Headlight |
Low/high 12V 40W/50W |
|
| Tail/stoplight |
12V 7W/23W (SEA Trade No. 1157) |
|
| Turn signal bulb |
Front/rear 12V 23W/23W |
|
| Speedometer bulb |
12V 3W |
|
| Tachometer bulb |
12V 3W |
|
| Neutral indicator bulb |
12V 3W |
|
| Turn signal indicator bulb |
12V 3W |
|
| High beam indicator bulb |
12V 3W |
|
CB750K2
Model Guide
The K2 model, introduced in November 1971, was available in Flake sunrise Orange, Candy Gold, and Brier Brown Metallic paint. The gas tank featured a gold stripe. The upper forks were chrome. The headlight shell was black. The taillight and side reflectors were larger in size.
| Engine # |
Changes |
| 2061311 |
Shorter oil hose w/white mark. Main jets 110, smaller cutouts in air filter case |
Specifications
| Item |
English |
Metric |
| Dimensions |
|
|
| Overall length |
85.6 in. |
2,175 mm |
| Overall width |
34.3 in. |
870 mm |
| Overall height |
46.1 in. |
1,170 mm |
| Wheel base |
57.3 in |
1,455 mm |
| Seat height |
31.9 in. |
810 mm |
| Foot Peg Height |
12.2 in. |
310 mm |
| Ground Clearance |
5.5 in. |
140 mm |
| Curb weight (dry) |
479 lb |
218 kg |
| Weight distribution L/R |
271.1/209.5 lb |
123/205 kg |
| Frame & Suspension |
|
|
| Type |
Double cradle tubular steel |
|
| Front |
|
|
| Fork travel |
5.6 in. |
143mm |
| Caster Angle |
63º |
|
| Trail length |
3.74 in. |
95mm |
| Oil capacity (dry) |
7.5-7.8 oz |
220-230 cc |
| Oil capacity (full) |
5.3-5.4 oz |
155-160cc |
| Rear Swing arm, travel |
3.3 in. |
85mm |
| Front Tire |
3.25-19 (4PR) Rib tire, 28psi |
|
| Rear Tire |
4.00-18 (4 PR) Block tire, 28psi |
|
| Brakes |
|
|
| Front Type |
Disk |
|
| Front lining swept area |
59.3 sq in |
382.9 sq cm |
| Rear Type |
Internal expanding shoe |
|
| Rear lining swept area |
34.2 sq in |
220.5 sq cm |
| Fuel |
|
|
| Tank Capacity |
4.5 US gal, 3.7 Imp. gal |
17 liter |
| Reserve Capacity |
1.3 US gal, 1.1 Imp. gal |
5 liter |
| Carburetor |
|
|
| Type |
Piston Valve, Keihin, slide type |
|
| Setting mark |
7A |
|
| Air screw opening |
1 3/8 turns |
|
| Idle speed |
950 rpm |
|
| Main jet |
#120 |
|
| Idle jet |
#40 |
|
| Float height |
0.866 in. |
26mm |
| Engine |
|
|
| Type |
Air-cooled, 4-stroke, O.H.C. engine |
|
| Cylinder Arrangement |
4-cylinder in line |
|
| Bore and Stroke |
2.402x2.480 in. |
61x63 mm |
| Displacement |
44.9135 cu in |
736 cc |
| Compression Ratio |
9.0:1 |
|
| Cylinder head compression |
170.7 psi |
12 kg/cm sq |
| Maximum Horsepower |
67 BHP@8,000 rpm |
|
| Maximum Torque |
44.12 lb-ft@7,000 rpm |
6.1 kg-m@7,000 rpm |
| Valve train |
Chain driven overhead camshaft |
|
| Oil Capacity |
3.7 US qt, 3.1 Imp. qt |
3.5 liter |
| Oil Tank Capacity |
2.1 US qt., 1.8 Imp. qt |
2 liter |
| Lubrication System |
Forced pressure and dry sump |
|
| Air filtration |
Paper element |
|
| Valve Timing |
|
|
| Intake Valve Open |
At 5º before top dead center |
|
| Intake Valve Close |
At 30º after bottom dead center |
|
| Exhaust Valve Open |
At 35º before bottom dead center |
|
| Exhaust Valve Close |
At 5º after top dead center |
|
| Valve Tappet Clearance |
|
|
| Intake |
0.002in. |
0.05mm |
| Exhaust |
0.003in. |
0.08mm |
| Engine weight (Wet) |
176.3 lb |
80 kg |
| Drive Train |
|
|
| Clutch |
Wet, multi-plate |
|
| Transmission Type |
5-speed, constant mesh |
|
| Gear Ratio I |
2.500:1 |
|
| Gear Ratio II |
1.708:1 |
|
| Gear Ratio III |
1.333:1 |
|
| Gear Ratio IV |
1.097:1 |
|
| Gear Ratio V |
0.939:1 |
|
| Primary reduction |
1.708:1 |
|
| Secondary reduction |
1.167:1 |
|
| Final Reduction |
2.667:1 (18T x 48T) |
|
| Electrical |
|
|
| Type |
12v, negative earth |
|
| Ignition |
Coil and contact breaker, spare spark |
|
| Starting system |
Electrical motor and kick pedal |
|
| Alternator |
Three phase A.C. generator 12V/0.21kW@5,000 rpm |
|
| Battery Capacity |
12V - 14 amp hour |
|
| Spark plug type |
NGK D8ES-L, NDX 24ES |
|
| Spark plug gap |
0.024 ~ 0.028 in. |
0.6 ~ 0.7 mm |
| Point gap |
0.012 ~ 0.016 in. |
0.3 ~ 0.4 mm |
| Headlight |
Low/high 12V 40W/50W |
|
| Tail/stoplight |
12V 3/32 CP (SAE Trade No. 1157) |
|
| Turn signal bulb |
12V 32/32 CP (SAE Trade no. R1034, L1073) |
|
| Speedometer bulb |
12V 2CP (SAE Trade No. 57) |
|
| Tachometer bulb |
12V 2CP (SAE Trade No. 57) |
|
| Neutral indicator bulb |
12V 2CP (SAE Trade No. 57) |
|
| Turn signal indicator bulb |
12V 2CP (SAE Trade No. 57) |
|
| High beam indicator bulb |
12V 2CP (SAE Trade No. 57) |
|
| Position light |
12V 4CP |
|
CB750K3
Model Guide
The 1973 CB750K3 was only available in the US as the K2 continued for a few more years in other markets. This model was offered in three colors, Flake Sunrise Orange, Maxim Brown Metallic, and Candy Bucchus Olive. The gas tank stripes were white, gold and black.
| Engine # |
Changes |
| 2200001 |
New cylinder head, new valve guide seals, improved oil passages to camshaft, new piston rings (three part oil scavenge rings), new cam chain guide, larger piston pin circlips, new final drive shaft, new sprocket cover |
| 2228679 |
New cylinder head, new valve guides, new valve guide seals, no more rubbers between fins |
Specifications
| Item |
English |
Metric |
| Dimensions |
|
|
| Overall length |
85.6 in. |
2,175 mm |
| Overall width |
34.3 in. |
870 mm |
| Overall height |
46.1 in. |
1,170 mm |
| Wheel base |
57.3 in |
1,455 mm |
| Seat height |
31.9 in. |
810 mm |
| Foot Peg Height |
12.2 in. |
310 mm |
| Ground Clearance |
5.5 in. |
140 mm |
| Curb weight (dry) |
479 lb |
218 kg |
| Weight distribution L/R |
271.1/209.5 lb |
123/205 kg |
| Frame & Suspension |
|
|
| Type |
Double cradle tubular steel |
|
| Front |
|
|
| Fork travel |
5.6 in. |
143mm |
| Caster Angle |
63º |
|
| Trail length |
3.74 in. |
95mm |
| Oil capacity (dry) |
7.5-7.8 oz |
220-230 cc |
| Oil capacity (full) |
5.3-5.4 oz |
155-160cc |
| Rear Swing arm, travel |
3.3 in. |
85mm |
| Front Tire |
3.25-19 (4PR) Rib tire, 28psi |
|
| Rear Tire |
4.00-18 (4 PR) Block tire, 28psi |
|
| Brakes |
|
|
| Front Type |
Disk |
|
| Front lining swept area |
59.3 sq in |
382.9 sq cm |
| Rear Type |
Internal expanding shoe |
|
| Rear lining swept area |
34.2 sq in |
220.5 sq cm |
| Fuel |
|
|
| Tank Capacity |
4.5 US gal, 3.7 Imp. gal |
17 liter |
| Reserve Capacity |
1.3 US gal, 1.1 Imp. gal |
5 liter |
| Carburetor |
|
|
| Type |
Piston Valve, Keihin, slide type |
|
| Setting mark |
7A |
|
| Air screw opening |
1 3/8 turns |
|
| Idle speed |
950 rpm |
|
| Main jet |
#105 |
|
| Idle jet |
#40 |
|
| Float height |
0.866 in. |
26mm |
| Engine |
|
|
| Type |
Air-cooled, 4-stroke, O.H.C. engine |
|
| Cylinder Arrangement |
4-cylinder in line |
|
| Bore and Stroke |
2.402x2.480 in. |
61x63 mm |
| Displacement |
44.9135 cu in |
736 cc |
| Compression Ratio |
9.0:1 |
|
| Cylinder head compression |
170.7 psi |
12 kg/cm sq |
| Maximum Horsepower |
67 BHP@8,000 rpm |
|
| Maximum Torque |
44.12 lb-ft@7,000 rpm |
6.1 kg-m@7,000 rpm |
| Valve train |
Chain driven overhead camshaft |
|
| Oil Capacity |
3.7 US qt, 3.1 Imp. qt |
3.5 liter |
| Oil Tank Capacity |
2.1 US qt., 1.8 Imp. qt |
2 liter |
| Lubrication System |
Forced pressure and dry sump |
|
| Air filtration |
Paper element |
|
| Valve Timing |
|
|
| Intake Valve Open |
At 5º before top dead center |
|
| Intake Valve Close |
At 30º after bottom dead center |
|
| Exhaust Valve Open |
At 35º before bottom dead center |
|
| Exhaust Valve Close |
At 5º after top dead center |
|
| Valve Tappet Clearance |
|
|
| Intake |
0.002in. |
0.05mm |
| Exhaust |
0.003in. |
0.08mm |
| Engine weight (Wet) |
176.3 lb |
80 kg |
| Drive Train |
|
|
| Clutch |
Wet, multi-plate |
|
| Transmission Type |
5-speed, constant mesh |
|
| Gear Ratio I |
2.500:1 |
|
| Gear Ratio II |
1.708:1 |
|
| Gear Ratio III |
1.333:1 |
|
| Gear Ratio IV |
1.097:1 |
|
| Gear Ratio V |
0.939:1 |
|
| Primary reduction |
1.708:1 |
|
| Secondary reduction |
1.167:1 |
|
| Final Reduction |
2.667:1 (18T x 48T) |
|
| Electrical |
|
|
| Type |
12v, negative earth |
|
| Ignition |
Coil and contact breaker, spare spark |
|
| Starting system |
Electrical motor and kick pedal |
|
| Alternator |
Three phase A.C. generator 12V/0.21kW@5,000 rpm |
|
| Battery Capacity |
12V - 14 amp hour |
|
| Spark plug type |
NGK D8ES-L, NDX 24ES |
|
| Spark plug gap |
0.024 ~ 0.028 in. |
0.6 ~ 0.7 mm |
| Point gap |
0.012 ~ 0.016 in. |
0.3 ~ 0.4 mm |
| Headlight |
Low/high 12V 40W/50W |
|
| Tail/stoplight |
12V 3/32 CP (SAE Trade No. 1157) |
|
| Turn signal bulb |
12V 32/32 CP (SAE Trade no. R1034, L1073) |
|
| Speedometer bulb |
12V 2CP (SAE Trade No. 57) |
|
| Tachometer bulb |
12V 2CP (SAE Trade No. 57) |
|
| Neutral indicator bulb |
12V 2CP (SAE Trade No. 57) |
|
| Turn signal indicator bulb |
12V 2CP (SAE Trade No. 57) |
|
| High beam indicator bulb |
12V 2CP (SAE Trade No. 57) |
|
| Position light |
12V 4CP |
|
CB750K4
Model Guide
The CB750 K4 was available only in the US and Japan and was offered in three colors: Boss Maroon Metallic, Flake Sunrise Orange, Freedom Green Metallic. The gas tank stripes were white, gold and black and wider than previous years. The speedometer displayed 20mph increments.
| Engine # |
Changes |
| 2304501 |
Smaller cam chain tunnel |
| 2352923 |
New cylinder block |
| 2348093 |
Crankcase cover gear indicator |
Specifications
| Item |
English |
Metric |
| Dimensions |
|
|
| Overall length |
85.6 in. |
2,175 mm |
| Overall width |
34.3 in. |
870 mm |
| Overall height |
46.1 in. |
1,170 mm |
| Wheel base |
57.3 in |
1,455 mm |
| Seat height |
31.9 in. |
810 mm |
| Foot Peg Height |
12.2 in. |
310 mm |
| Ground Clearance |
5.5 in. |
140 mm |
| Curb weight (dry) |
479 lb |
218 kg |
| Weight distribution L/R |
271.1/209.5 lb |
123/205 kg |
| Frame & Suspension |
|
|
| Type |
Double cradle tubular steel |
|
| Front |
|
|
| Fork travel |
5.6 in. |
143mm |
| Caster Angle |
63º |
|
| Trail length |
3.74 in. |
95mm |
| Oil capacity (dry) |
7.5-7.8 oz |
220-230 cc |
| Oil capacity (full) |
5.3-5.4 oz |
155-160cc |
| Rear Swing arm, travel |
3.3 in. |
85mm |
| Front Tire |
3.25-19 (4PR) Rib tire, 28psi |
|
| Rear Tire |
4.00-18 (4 PR) Block tire, 28psi |
|
| Brakes |
|
|
| Front Type |
Disk |
|
| Front lining swept area |
59.3 sq in |
382.9 sq cm |
| Rear Type |
Internal expanding shoe |
|
| Rear lining swept area |
34.2 sq in |
220.5 sq cm |
| Fuel |
|
|
| Tank Capacity |
4.5 US gal, 3.7 Imp. gal |
17 liter |
| Reserve Capacity |
1.3 US gal, 1.1 Imp. gal |
5 liter |
| Carburetor |
|
|
| Type |
Piston Valve, Keihin, slide type |
|
| Setting mark |
7A |
|
| Air screw opening |
1 3/8 turns |
|
| Idle speed |
950 rpm |
|
| Main jet |
#105 |
|
| Idle jet |
#40 |
|
| Float height |
0.866 in. |
26mm |
| Engine |
|
|
| Type |
Air-cooled, 4-stroke, O.H.C. engine |
|
| Cylinder Arrangement |
4-cylinder in line |
|
| Bore and Stroke |
2.402x2.480 in. |
61x63 mm |
| Displacement |
44.9135 cu in |
736 cc |
| Compression Ratio |
9.0:1 |
|
| Cylinder head compression |
170.7 psi |
12 kg/cm sq |
| Maximum Horsepower |
67 BHP@8,000 rpm |
|
| Maximum Torque |
44.12 lb-ft@7,000 rpm |
6.1 kg-m@7,000 rpm |
| Valve train |
Chain driven overhead camshaft |
|
| Oil Capacity |
3.7 US qt, 3.1 Imp. qt |
3.5 liter |
| Oil Tank Capacity |
2.1 US qt., 1.8 Imp. qt |
2 liter |
| Lubrication System |
Forced pressure and dry sump |
|
| Air filtration |
Paper element |
|
| Valve Timing |
|
|
| Intake Valve Open |
At 5º before top dead center |
|
| Intake Valve Close |
At 30º after bottom dead center |
|
| Exhaust Valve Open |
At 35º before bottom dead center |
|
| Exhaust Valve Close |
At 5º after top dead center |
|
| Valve Tappet Clearance |
|
|
| Intake |
0.002in. |
0.05mm |
| Exhaust |
0.003in. |
0.08mm |
| Engine weight (Wet) |
176.3 lb |
80 kg |
| Drive Train |
|
|
| Clutch |
Wet, multi-plate |
|
| Transmission Type |
5-speed, constant mesh |
|
| Gear Ratio I |
2.500:1 |
|
| Gear Ratio II |
1.708:1 |
|
| Gear Ratio III |
1.333:1 |
|
| Gear Ratio IV |
1.097:1 |
|
| Gear Ratio V |
0.939:1 |
|
| Primary reduction |
1.708:1 |
|
| Secondary reduction |
1.167:1 |
|
| Final Reduction |
2.667:1 (18T x 48T) |
|
| Electrical |
|
|
| Type |
12v, negative earth |
|
| Ignition |
Coil and contact breaker, spare spark |
|
| Starting system |
Electrical motor and kick pedal |
|
| Alternator |
Three phase A.C. generator 12V/0.21kW@5,000 rpm |
|
| Battery Capacity |
12V - 14 amp hour |
|
| Spark plug type |
NGK D8ES-L, NDX 24ES |
|
| Spark plug gap |
0.024 ~ 0.028 in. |
0.6 ~ 0.7 mm |
| Point gap |
0.012 ~ 0.016 in. |
0.3 ~ 0.4 mm |
| Headlight |
Low/high 12V 40W/50W |
|
| Tail/stoplight |
12V 3/32 CP (SAE Trade No. 1157) |
|
| Turn signal bulb |
12V 32/32 CP (SAE Trade no. R1034, L1073) |
|
| Speedometer bulb |
12V 2CP (SAE Trade No. 57) |
|
| Tachometer bulb |
12V 2CP (SAE Trade No. 57) |
|
| Neutral indicator bulb |
12V 2CP (SAE Trade No. 57) |
|
| Turn signal indicator bulb |
12V 2CP (SAE Trade No. 57) |
|
| High beam indicator bulb |
12V 2CP (SAE Trade No. 57) |
|
| Position light |
12V 4CP |
|
CB750K5
Model Guide
The CB750 K5 was available only in the US market and offered in two Colors, Planet Blue Metallic and Flake Apricot Red with dark green instrument faces. The speedometer was marked in 10mph increments.
Specifications
| Item |
English |
Metric |
| Dimensions |
|
|
| Overall length |
85.6 in. |
2,175 mm |
| Overall width |
34.3 in. |
870 mm |
| Overall height |
46.1 in. |
1,170 mm |
| Wheel base |
57.3 in |
1,455 mm |
| Seat height |
31.9 in. |
810 mm |
| Foot Peg Height |
12.2 in. |
310 mm |
| Ground Clearance |
5.5 in. |
140 mm |
| Curb weight (dry) |
479 lb |
218 kg |
| Weight distribution L/R |
271.1/209.5 lb |
123/205 kg |
| Frame & Suspension |
|
|
| Type |
Double cradle tubular steel |
|
| Front |
|
|
| Fork travel |
5.6 in. |
143mm |
| Caster Angle |
63º |
|
| Trail length |
3.74 in. |
95mm |
| Oil capacity (dry) |
7.5-7.8 oz |
220-230 cc |
| Oil capacity (full) |
5.3-5.4 oz |
155-160cc |
| Rear Swing arm, travel |
3.3 in. |
85mm |
| Front Tire |
3.25-19 (4PR) Rib tire, 28psi |
|
| Rear Tire |
4.00-18 (4 PR) Block tire, 28psi |
|
| Brakes |
|
|
| Front Type |
Disk |
|
| Front lining swept area |
59.3 sq in |
382.9 sq cm |
| Rear Type |
Internal expanding shoe |
|
| Rear lining swept area |
34.2 sq in |
220.5 sq cm |
| Fuel |
|
|
| Tank Capacity |
4.5 US gal, 3.7 Imp. gal |
17 liter |
| Reserve Capacity |
1.3 US gal, 1.1 Imp. gal |
5 liter |
| Fuel Type |
Low-lead gasoline with 91 octane number or higher |
|
| Carburetor |
|
|
| Type |
Four piston valve type, venturi diameter 28mm |
|
|
|
|
| Setting mark |
7A |
|
| Air screw opening |
1 turn |
|
| Idle speed |
950 rpm |
|
| Main jet |
#105 |
|
| Idle jet |
#40 |
|
| Float height |
0.866 in. |
26mm |
| Engine |
|
|
| Type |
Air-cooled, 4-stroke, O.H.C. engine |
|
| Cylinder Arrangement |
4-cylinder in line |
|
| Bore and Stroke |
2.402x2.480 in. |
61x63 mm |
| Displacement |
44.9135 cu in |
736 cc |
| Compression Ratio |
9.0:1 |
|
| Cylinder head compression |
170.7 psi |
12 kg/cm sq |
| Maximum Horsepower |
67 BHP@8,000 rpm |
|
| Maximum Torque |
44.12 lb-ft@7,000 rpm |
6.1 kg-m@7,000 rpm |
| Valve train |
Chain driven overhead camshaft |
|
| Oil Capacity |
3.7 US qt, 3.1 Imp. qt |
3.5 liter |
| Oil Tank Capacity |
2.1 US qt., 1.8 Imp. qt |
2 liter |
| Lubrication System |
Forced pressure and dry sump |
|
| Air filtration |
Paper element |
|
| Valve Timing |
|
|
| Intake Valve Open |
At 5º before top dead center |
|
| Intake Valve Close |
At 30º after bottom dead center |
|
| Exhaust Valve Open |
At 35º before bottom dead center |
|
| Exhaust Valve Close |
At 5º after top dead center |
|
| Valve Tappet Clearance |
|
|
| Intake |
0.002in. |
0.05mm |
| Exhaust |
0.003in. |
0.08mm |
| Engine weight (Wet) |
176.3 lb |
80 kg |
| Drive Train |
|
|
| Clutch |
Wet, multi-plate |
|
| Transmission Type |
5-speed, constant mesh |
|
| Gear Ratio I |
2.500:1 |
|
| Gear Ratio II |
1.708:1 |
|
| Gear Ratio III |
1.333:1 |
|
| Gear Ratio IV |
1.097:1 |
|
| Gear Ratio V |
0.939:1 |
|
| Primary reduction |
1.708:1 |
|
| Secondary reduction |
1.167:1 |
|
| Final Reduction |
2.667:1 (18T x 48T) |
|
| Electrical |
|
|
| Type |
12v, negative earth |
|
| Ignition |
Coil and contact breaker, spare spark |
|
| Starting system |
Electrical motor and kick pedal |
|
| Alternator |
Three phase A.C. generator 12V/0.21kW@5,000 rpm |
|
| Battery Capacity |
12V - 14 amp hour |
|
| Spark plug type |
NGK D8ES-L, NDX 24ES |
|
| Spark plug gap |
0.024 ~ 0.028 in. |
0.6 ~ 0.7 mm |
| Point gap |
0.012 ~ 0.016 in. |
0.3 ~ 0.4 mm |
| Headlight |
Low/high 12V 40W/50W |
|
| Tail/stoplight |
12V 3/32 CP (SAE Trade No. 1157) |
|
| Turn signal bulb |
12V 32/32 CP (SAE Trade no. R1034, L1073) |
|
| Speedometer bulb |
12V 2CP (SAE Trade No. 57) |
|
| Tachometer bulb |
12V 2CP (SAE Trade No. 57) |
|
| Neutral indicator bulb |
12V 2CP (SAE Trade No. 57) |
|
| Turn signal indicator bulb |
12V 2CP (SAE Trade No. 57) |
|
| High beam indicator bulb |
12V 2CP (SAE Trade No. 57) |
|
| Position light |
12V 4CP |
|
CB750K6
Model Guide
The CB750 K6 replaced the K5 in the US, the K4 in Japan and the K2 in the rest of the world. This model was available in one color, Candy Antares Red and featured light green instrument faces.
| Engine # |
Changes |
| 2470427 |
clutch almost identical to F1: new clutch basket, new clutch cover and chrome cover |
| 2434657-2439607 |
New gear shift drum, new center shift fork for improved shifting. New gears on countershaft w/bronze bushings, new case |
Specifications
| Item |
English |
Metric |
| Dimensions |
|
|
| Overall length |
85.6 in. |
2,175 mm |
| Overall width |
34.3 in. |
870 mm |
| Overall height |
46.1 in. |
1,170 mm |
| Wheel base |
57.3 in |
1,455 mm |
| Seat height |
31.9 in. |
810 mm |
| Foot Peg Height |
12.2 in. |
310 mm |
| Ground Clearance |
5.5 in. |
140 mm |
| Curb weight (dry) |
479 lb |
218 kg |
| Weight distribution L/R |
271.1/209.5 lb |
123/205 kg |
| Frame & Suspension |
|
|
| Type |
Double cradle tubular steel |
|
| Front |
|
|
| Fork travel |
5.6 in. |
143mm |
| Caster Angle |
63º |
|
| Trail length |
3.74 in. |
95mm |
| Oil capacity (dry) |
7.5-7.8 oz |
220-230 cc |
| Oil capacity (full) |
5.3-5.4 oz |
155-160cc |
| Rear Swing arm, travel |
3.3 in. |
85mm |
| Front Tire |
3.25-19 (4PR) Rib tire, 28psi |
|
| Rear Tire |
4.00-18 (4 PR) Block tire, 28psi |
|
| Brakes |
|
|
| Front Type |
Disk |
|
| Front lining swept area |
59.3 sq in |
382.9 sq cm |
| Rear Type |
Internal expanding shoe |
|
| Rear lining swept area |
34.2 sq in |
220.5 sq cm |
| Fuel |
|
|
| Tank Capacity |
4.5 US gal, 3.7 Imp. gal |
17 liter |
| Reserve Capacity |
1.3 US gal, 1.1 Imp. gal |
5 liter |
| Fuel Type |
Low-lead gasoline with 91 octane number or higher |
|
| Carburetor |
|
|
| Type |
Four piston valve type, venturi diameter 28mm |
|
|
|
|
| Setting mark |
7A |
|
| Air screw opening |
1 turn |
|
| Idle speed |
950 rpm |
|
| Main jet |
#105 |
|
| Idle jet |
#40 |
|
| Float height |
0.866 in. |
26mm |
| Engine |
|
|
| Type |
Air-cooled, 4-stroke, O.H.C. engine |
|
| Cylinder Arrangement |
4-cylinder in line |
|
| Bore and Stroke |
2.402x2.480 in. |
61x63 mm |
| Displacement |
44.9135 cu in |
736 cc |
| Compression Ratio |
9.0:1 |
|
| Cylinder head compression |
170.7 psi |
12 kg/cm sq |
| Maximum Horsepower |
67 BHP@8,000 rpm |
|
| Maximum Torque |
44.12 lb-ft@7,000 rpm |
6.1 kg-m@7,000 rpm |
| Valve train |
Chain driven overhead camshaft |
|
| Oil Capacity |
3.7 US qt, 3.1 Imp. qt |
3.5 liter |
| Oil Tank Capacity |
2.1 US qt., 1.8 Imp. qt |
2 liter |
| Lubrication System |
Forced pressure and dry sump |
|
| Air filtration |
Paper element |
|
| Valve Timing |
|
|
| Intake Valve Open |
At 5º before top dead center |
|
| Intake Valve Close |
At 30º after bottom dead center |
|
| Exhaust Valve Open |
At 35º before bottom dead center |
|
| Exhaust Valve Close |
At 5º after top dead center |
|
| Valve Tappet Clearance |
|
|
| Intake |
0.002in. |
0.05mm |
| Exhaust |
0.003in. |
0.08mm |
| Engine weight (Wet) |
176.3 lb |
80 kg |
| Drive Train |
|
|
| Clutch |
Wet, multi-plate |
|
| Transmission Type |
5-speed, constant mesh |
|
| Gear Ratio I |
2.500:1 |
|
| Gear Ratio II |
1.708:1 |
|
| Gear Ratio III |
1.333:1 |
|
| Gear Ratio IV |
1.097:1 |
|
| Gear Ratio V |
0.939:1 |
|
| Primary reduction |
1.708:1 |
|
| Secondary reduction |
1.167:1 |
|
| Final Reduction |
2.667:1 (18T x 48T) |
|
| Electrical |
|
|
| Type |
12v, negative earth |
|
| Ignition |
Coil and contact breaker, spare spark |
|
| Starting system |
Electrical motor and kick pedal |
|
| Alternator |
Three phase A.C. generator 12V/0.21kW@5,000 rpm |
|
| Battery Capacity |
12V - 14 amp hour |
|
| Spark plug type |
NGK D8ES-L, NDX 24ES |
|
| Spark plug gap |
0.024 ~ 0.028 in. |
0.6 ~ 0.7 mm |
| Point gap |
0.012 ~ 0.016 in. |
0.3 ~ 0.4 mm |
| Headlight |
Low/high 12V 40W/50W |
|
| Tail/stoplight |
12V 3/32 CP (SAE Trade No. 1157) |
|
| Turn signal bulb |
12V 32/32 CP (SAE Trade no. R1034, L1073) |
|
| Speedometer bulb |
12V 2CP (SAE Trade No. 57) |
|
| Tachometer bulb |
12V 2CP (SAE Trade No. 57) |
|
| Neutral indicator bulb |
12V 2CP (SAE Trade No. 57) |
|
| Turn signal indicator bulb |
12V 2CP (SAE Trade No. 57) |
|
| High beam indicator bulb |
12V 2CP (SAE Trade No. 57) |
|
| Position light |
12V 4CP |
|
CB750K7
Model Guide
The 1977 CB750K7 was available worldwide in two colors, Candy Alpha Red and Excel Black. The gas tank featured a gold stripe with a white and red pinstripe. The “750 FOUR K” side cover emblem was gold.
| Engine # |
Changes |
| 2700001 |
Carburetors w/accelerator pump, shorter intake rubbers, new final drive shaft, sprocket w/center bolt, wider chain line (as F2), final drive 15/41, new clutch, new camshaft (as F1), new pistons (as F), compression ratio 9.2/1. New transmission: 4th gear 1.133 i/o 1.087. Final drive gear 50 teeth i/o 56 (as F1), primary drive 1.985 i/o 1.708 |
| 2719530 |
New valve guides |
| 2719997 |
New cam carriers (same as F2) |
Specifications
| Item |
English |
Metric |
| Dimensions |
|
|
| Overall length |
89.8 in. |
2,280 mm |
| Overall width |
34.6 in. |
880 mm |
| Overall height |
46.7 in. |
1,185 mm |
| Wheel base |
58.9 in |
1,495 mm |
| Seat height |
31.9 in. |
810 mm |
| Foot Peg Height |
13.0 in. |
330 mm |
| Ground Clearance |
5.9 in. |
150 mm |
| Curb weight (dry) |
508 lb |
231 kg |
| Frame & Suspension |
|
|
| Type |
Double cradle tubular steel |
|
| Front |
|
|
| Fork travel |
5.6 in. |
143 mm |
| Caster Angle |
62º |
|
| Trail length |
4.5 in. |
115 mm |
| Oil capacity (dry) |
7.5-7.8 oz |
220-230 cc |
| Oil capacity (full) |
5.3-5.4 oz |
155-160cc |
| Rear Swing arm, travel |
4.0 in. |
101.6 mm |
| Front Tire |
3.25-19 (4PR) Rib tire, 28psi |
|
| Rear Tire |
4.50-17 (4 PR) Block tire, 32/40 psi |
|
| Brakes |
|
|
| Front Type |
Disk |
|
| Front lining swept area |
59.3 sq in |
382.9 sq cm |
| Rear Type |
Internal expanding shoe |
|
| Rear lining swept area |
34.2 sq in |
220.5 sq cm |
| Fuel |
|
|
| Tank Capacity |
5.0 US gal, 4.2 Imp. gal |
19 liter |
| Reserve Capacity |
1.1 US gal, 0.9 Imp. gal |
4 liter |
| Fuel Type |
Low-lead gasoline with 91 octane number or higher |
|
| Carburetor |
|
|
| Type |
Four piston valve type, venturi diameter 28mm |
|
|
|
|
| Pilot Screw Opening |
Fixed by idle limiter (1 1/2 +/- 1/2) |
|
| Idle speed |
1000 rpm |
|
| Engine |
|
|
| Type |
Air-cooled, 4-stroke, O.H.C. engine |
|
| Cylinder Arrangement |
4-cylinder in line |
|
| Bore and Stroke |
2.402x2.480 in. |
61x63 mm |
| Displacement |
44.9135 cu in |
736 cc |
| Compression Ratio |
9.2:1 |
|
| Cylinder head compression |
170.7 psi |
12 kg/cm sq |
| Maximum Horsepower |
67 BHP@8,000 rpm |
|
| Maximum Torque |
44.12 lb-ft@7,000 rpm |
6.1 kg-m@7,000 rpm |
| Valve train |
Chain driven overhead camshaft |
|
| Oil Capacity |
3.7 US qt, 3.1 Imp. qt |
3.5 liter |
| Oil Tank Capacity |
2.1 US qt., 1.8 Imp. qt |
2 liter |
| Lubrication System |
Forced pressure and dry sump |
|
| Air filtration |
Paper element |
|
| Valve Timing |
|
|
| Intake Valve |
Opens: 0 degrees BTDC |
Closes 40 degrees ATDC |
|
|
|
| Exhaust Valve |
Opens: 40 degrees BBDC |
Closes 0 degrees ATDC |
| Valve Tappet Clearance |
|
|
| Intake |
0.002in. |
0.05mm |
| Exhaust |
0.003in. |
0.08mm |
| Engine weight (Wet) |
176.3 lb |
80 kg |
| Drive Train |
|
|
| Clutch |
Wet, multi-plate |
|
| Transmission Type |
5-speed, constant mesh |
|
| Gear Ratio I |
2.500:1 |
|
| Gear Ratio II |
1.708:1 |
|
| Gear Ratio III |
1.333:1 |
|
| Gear Ratio IV |
1.133:1 |
|
| Gear Ratio V |
0.939:1 |
|
| Primary reduction |
1.708:1 |
|
| Secondary reduction |
1.167:1 |
|
| Final Reduction |
2.733, (15Tx41T) |
|
| Electrical |
|
|
| Type |
12v, negative earth |
|
| Ignition |
Coil and contact breaker, spare spark |
|
| Ignition Advance |
“F” mark: 10 degrees BTDC; Max Advance: 35 degrees; RPM from “F” to Max: 1,200-2,500; Dwell angle: 190 +/- 5 degrees |
|
| Starting system |
Electrical motor and kick pedal |
|
| Alternator |
Three phase A.C. generator 12V/0.21kW@5,000 rpm |
|
| Battery Capacity |
12V - 14 amp hour |
|
| Fuse Capacity |
Main: 15A; Head: 7A; Tail: 5A |
|
| Spark plug |
USA: NGK D8ES-L, ND X24ES |
Canada: NGK DR8ES-L ND X24ESR |
| Condenser Capacity |
0.20-0.24 mf |
|
CB750K8
Model Guide
The final single overhead cam CB750 was so | May 1977 - May 1978 | 36,000 | Candy Alpha Red, 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 stepped design. |
| Engine # |
Changes |
| 3000001 |
New intake and exhaust valves, new valve spring retainers |
| 3021913 |
New cylinder block w/larger cam chain tunnel |
Specifications
| Item |
English |
Metric |
| Dimensions |
|
|
| Overall length |
89.8 in. |
2,280 mm |
| Overall width |
34.6 in |
880 mm |
| Overall height |
46.7 in |
1,185 mm |
| Wheel base |
58.9 in |
1,495 mm |
| Seat height |
31.9 in |
810 mm |
| Foot Peg Height |
13.0 in |
330 mm |
| Ground Clearance |
5.9 in |
150 mm |
| Curb weight (dry) |
508 lb |
231 kg |
| Frame & Suspension |
|
|
| Type |
Double cradle |
|
| Caster Angle |
62º |
|
| Trail Length |
4.5 in, 115 mm |
|
| Fork Oil |
5.3-5.4 ozs |
145-155cc |
| Front Suspension |
Telescopic fork |
travel 5.6 in., 141.5mm |
| Rear Suspension |
Swing arm |
travel 4.0 in., 101.6mm |
| Front Tire |
3.50H-19 (4PR) Rib |
air pressure 28 psi |
| Rear Tire |
4.50H-17A (4 PR) Block |
air pressure 32/40 psi |
| Brakes |
|
|
| Front |
Disk |
|
| Rear |
Internal expanding shoe |
|
| Fuel |
|
|
| Fuel |
Octane 91+ |
|
| Tank Capacity |
5.1 US gal, 4.3 Imp. gal |
19.5 liter |
| Reserve Capacity |
1.1 US gal, 0.9 Imp. gal |
4.0 liter |
| Engine |
|
|
| Type |
Air-cooled, 4-stroke, O.H.C. engine |
|
| Cylinder Arrangement |
4-cylinder in line |
|
| Bore and Stroke |
2.402x2.408 in |
61.0x63.0 mm |
| Displacement |
44.9 ci |
736 cc |
| Compression Ratio |
9.2:1 |
|
| Valve train |
Chain driven over head camshaft |
|
| Lubrication System |
Forced pressure dry sump |
|
| Engine Oil |
3.7 US qt, 3.1 Imp. qt |
3.5 liter |
| Valves Timing |
|
|
| Intake |
Opens: 0 degrees BTDC |
Closes 40 degrees ATDC |
| Exhaust |
Opens: 40 degrees BBDC |
Closes 0 degrees ATDC |
| Tappet Clearance |
|
|
| Intake |
0.002in. |
0.05mm |
| Exhaust |
0.003in. |
0.08mm |
| Carburetor |
|
|
| Type |
Four piston valve type, venturi diameter 28mm (1.102in) |
|
| Air Filtration |
Paper filter |
|
| Pilot Screw Opening |
Fixed by idle limiter (1 1/2 +/- 1/2) |
|
| Idle speed |
1000 rpm |
|
| Transmission |
|
|
| Type |
5-speed, constant mesh |
|
| Clutch |
Wet, multi plate type |
|
| Primary reduction |
1.708 |
|
| Gear ratio I |
2.500 |
|
| Gear ratio II |
1.708 |
|
| Gear ratio III |
1.333 |
|
| Gear ratio IV |
1.133 |
|
| Final Reduction |
2.733 (15Tx41T) |
|
| Gear shift pattern |
Left foot operated return system |
|
| Electrical |
|
|
| Ignition |
Battery and ignition coil |
|
| Ignition Advance |
“F” mark: 10 degrees BTDC; Max Advance: 35 degrees; RPM from “F” to Max: 1,200-2,500; Dwell angle: 190 +/- 5 degrees |
|
| Starting system |
Electrical motor or kick pedal |
|
| Alternator |
Three phase A.C. generator 0.21kW@5,000 rpm |
|
| Battery Capacity |
12V - 14AH |
|
| Fuse Capacity |
Main: 15A; Head: 7A; Tail: 5A |
|
| Spark plug |
USA: NGK D8EA, ND X24ES-U |
Canada: NGK DR8ES-L ND X24ESR-U |
| Condenser Capacity |
0.20-0.24 mf |
|
