| MODEL | HONDA CB 125S 1971 - 1975 |
| Year | 1971 - 1975 |
| Engine Type | Four stroke, single cylinder, SOHC, 2 valves |
| Displacement / Capacity | 122 cc / 7.4 cu in |
| Bore X Stroke | 56.5 x 49.5 mm |
| Compression Ratio | 9.4:1 |
| Cooling System | Air cooled |
| Max Power | 8.8 kW / 12 hp @ 9000 rpm |
| Max Torque | 9.81 Nm / 7 lb-ft @ 8000 rpm |
| Ignition | Battery & coil (contact breaker points) |
| Induction | Carburettor |
| Start System | Kick |
| TRANSMISSION SPECS | |
| Lubrication | Wet sump |
| Gear Box | 5 Speed |
| Clutch | Wet, multi-disc |
| Final Drive | Chain |
| CHASSIS SPECS | |
| Frame | — |
| Front Suspension | Oil-damped telescopic forks |
| Rear Suspension | Swing arm, dual shocks |
| Front Brakes | Drum |
| Rear Brakes | Drum |
| DIMENSION SPECS | |
| Overall Length | — |
| Overall Width | — |
| Overall Height | — |
| Seat Height | — |
| Wheelbase | — |
| Ground Clearance | — |
| Dry Weight | 85 kg / 187 lbs |
| Wet Weight | 92 kg / 203 lbs |
| WHEEL SPECS | |
| Front Tyre | 2.75-18 |
| Rear Tyre | 3.00-18 |
| FUEL SYSTEM | |
| Fuel Capacity | 7.5 Litres / 2 US gal |
| Fuel Consumption | — |
| Top Speed | — |
The CB 125S was Honda's single-cylinder CB125 of the early 1970s, a simple and cheap learner and commuter bike. Its 122 cc overhead-cam single drove through a five-speed gearbox, and it was light and frugal rather than fast. Detail changes during the run included a tachometer from 1974 in some markets and a front disc on later bikes.
