| MODEL | HONDA CB 750 FOUR K3 1973 |
| Year | 1973 |
| Engine Type | Four stroke, transverse four cylinder, SOHC, 2 valves per cylinder |
| Displacement / Capacity | 736 cc / 44.9 cu in |
| Bore X Stroke | 61 x 63 mm |
| Compression Ratio | 9.0:1 |
| Cooling System | Air cooled |
| Max Power | 50 kW / 67 hp @ 8000 rpm |
| Max Torque | 60 Nm / 44 lb-ft @ 7000 rpm |
| Ignition | Battery, coils |
| Induction | 4 x 28 mm Keihin carburetors |
| Start System | Electric and kick |
| TRANSMISSION SPECS | |
| Lubrication | Dry sump |
| Gear Box | 5 speed |
| Clutch | Multi-plate, wet |
| Final Drive | Chain |
| CHASSIS SPECS | |
| Frame | Tubular steel duplex cradle |
| Front Suspension | Telescopic fork, non-adjustable |
| Rear Suspension | Swingarm, dual shocks, preload adjustable |
| Front Brakes | Single 296 mm disc |
| Rear Brakes | 179 mm drum |
| DIMENSION SPECS | |
| Overall Length | — |
| Overall Width | — |
| Overall Height | — |
| Seat Height | 800 mm / 31.5 in |
| Wheelbase | 1453 mm / 57.2 in |
| Ground Clearance | 160 mm / 6.3 in |
| Dry Weight | — |
| Wet Weight | 226 kg / 499 lbs |
| WHEEL SPECS | |
| Front Tyre | 3.25-19 |
| Rear Tyre | 4.00-18 |
| FUEL SYSTEM | |
| Fuel Capacity | 17 Litres / 4.5 US gal |
| Fuel Consumption | 6.9 L/100 km / 14.6 km/l / 34.3 US mpg |
| Top Speed | 198 km/h / 123.2 mph |
The K3 was the 1973 US-market version of the CB750 Four, mechanically unchanged but with a slightly smaller listed fuel tank and new paint in Flake Sunrise Orange, Candy Bacchus Olive or Maxim Brown Metallic. By now the bike was the established benchmark big four rather than a novelty.
