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CB750 K4: 1974

Production Dates June 1973 through May 1974
Production Numbers 60,000
Starting Frame# 2300001
Starting Engine# E2300001
Colors Boss Maroon Metallic, Flake Sunrise Orange, Freedom Green Metallic
Features The gas tank stripes were white, gold and black and wider than previous years. The speedometer showed increments of 20mph.


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


Frame & Suspension
Type Double cradle
Front Suspension Telescopic fork, travel 5.6 in., 143mm
Rear Suspension Swing arm, travel 3.3 in., 85mm
Front Tire Size, Type 3.25-19 (4PR) Rib tire, tire air pressure 2.0 kg/cm2, 28 psi
Rear Tire Size, Type 4.00-18 (4 PR) Block tire, tire air pressure 2.0 kg/cm2, 28 psi
Front Brake Disk brake, lining swept area 59.3 sq. in., 382.9cm2
Rear Brake Internal expanding shoe, lining swept area 34.2in2, 220.5cm2
Fuel Capacity 4.5 US gal, 3.7 Imp. gal 17 liter
Fuel Reserve Capacity 1.3 US gal, 1.1 Imp. gal 5 liter
Caster Angle 63º
Trail Length 3.7 in. 95mm
Front fork oil capacity (dry fill) 7.5-7.8 ozs 220-230 cc
Front fork oil capacity (refill) 5.3-5.4 ozs 155-160cc


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 cu in 736 cc
Compression Ratio 9.0:1
Valve train Chain driven over head camshaft
Oil Capacity 3.7 US qt, 3.1 Imp. pt 3.5 liter
Lubrication System Forced pressure and dry sump
Cylinder head compression 170.7 psi, 12 kg/cm2
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
Idle speed 950 rpm


Type Piston Valve
Setting mark 7A
Main jet #105
Slow jet #40
Air screw opening 1+-3/8 turns
Float height 0.866 in., 26mm


Drive Train
Clutch Wet, multi plate type
Transmission 5-speed, constant mesh
Primary reduction 1.708
Gear ratio I 2.500
Gear ratio II 1.708
Gear ratio III 1.333
Gear ratio IV 1.097
Gear ratio V                                                                                                                                                                                    0.939
Final Reduction 2.667, drive sprocket 18T, driven sprocket 48T
Gear shift pattern Left foot operated return system


Ignition Battery and ignition coil
Starting system Electrical motor or kick pedal
Alternator Three phase A.C. generator 12V/0.21kW@5,000 rpm
Battery Capacity 12V - 14AH
Spark plug NGK D8ES-L, NDX 24ES
Headlight Low/high 12V 40W/50W
Tail/stoplight Tail/stop 12V 3/32 CP (SAE Trade No. 1157)
Turn signal light Front/rear 12V 32/32 CP (SAE Trade no. R1034, L1073
Speedometer light 12V 2CP (SAE Trade No. 57)
Tachometer light 12V 2CP (SAE Trade No. 57)
Neutral indicator light 12V 2CP (SAE Trade No. 57)
Turn signal indicator light 12V 2CP (SAE Trade No. 57)
High beam indicator light 12V 2CP (SAE Trade No. 57)
Position light 12V 4CP




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