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Historical Showcase



Historical CB750 K1 Technical Specifications

The following information is taken from the Honda Motorcycle Guide.
   1 9 7 0 to 1 9 7 1

 
Model Year: 1970 to 1971
Frame #: CB750-1044650
Engine #: CB750E-1044806
Colors: Candy Gold, Candy Ruby Red, Candy Garnet Brown, Valley Green Met.
Remarks: The tank, side covers, headlight shell, and upper forks were of the basic color (red, gold, green, or brown). The side covers were smaller without slots on the leading edge. The throttle system used a push-pull cable arrangement to a linkage joining the four carbs together. 5-spd. 4/4


Standard Size
Metric Size
 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  
Dry weight 479 lb 218 kg  
 Weight distribution L/R 271.1/209.5 lb 123/205 kg  
 Frame      
 Type Double cradle tubular steel    
 F. Suspension, travel 5.6 in. 143 mm telescopic fork
 R. Suspension, travel 3.3 in. 85 mm Swing arm
 F. Tire pressure, size 28 psi 2.0 kg/cm2 3.25-19 (4 PR)
 R. Tire pressure, size 28 psi 2.0 kg/cm2 4.00-18 (4 PR)
 F. Brake, lining area 2.9 in2x 2 53 cm2x2 Disk brake
 R. Brake, lining area 8.2 in2x 2 53 cm2x2 Internal expanding shoe
 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 63 degrees    
 Trail Length 3.74 in. 95 mm  
 Front Fork oil capacity 7.0-7.3 oz 220-230 cc from dry
 Engine      
 Type Air cooled,
inline four cylinder, four stroke, sohc
   
 Bore and Stroke 2.401 x 2.408 in. 61 x 63 mm  
 Displacement 44.93 cu in 736 cc  
 Compression 170.7 psi 12 kg/cm2  
 Carburetor, Venturi Dia. 4x28mm Keihin,
slide type
   
 Valve train Chain driven
overhead camshaft
   
 Oil Capacity 7.39 US pt, 6.16
Imp. pt
3.5 liter  
 Oil Tank Capacity 4.22 US pt.,
3.55 Imp. pt
2 liter  
 Lubrication System Forced pressure
and dry sump
   
 Air filtration Paper element    
 Valve Tappet Clearance In: 0.002 in.,
Ex: 0.003 in.
In:0.05 mm,
Ex:0.08 mm
 
 Engine weight (Wet) 176.3 lb 80 kg  
 Air screw opening 1 3/8 turn    
 Idle speed 900 rpm    
 Main jet #120    
 Idle jet #40    
 Air jet #100    
 Float height 0.866 in. 26mm  
 Drive Train      
Clutch Wet, multi-plate    
Transmission 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 3-phase 12 V
0.21kW@5,000 rpm
   
Battery Capacity 12V - 14 amp hour    
Spark plug 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  


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