| MODEL | HONDA CB 125JX 1980 |
| Year | 1980 |
| Engine Type | Four stroke, single cylinder, SOHC, 2 valve |
| Displacement / Capacity | 124 cc / 7.6 cu in |
| Bore X Stroke | 56.5 x 49.5 mm |
| Compression Ratio | 7.4:1 |
| Cooling System | Air cooled |
| Max Power | 12.4 kW / 17 hp @ 11500 rpm |
| Max Torque | — |
| Ignition | CDI |
| Induction | — |
| Start System | Kick |
| TRANSMISSION SPECS | |
| Lubrication | Wet sump |
| Gear Box | 5 Speed |
| Clutch | Wet, multi-disc |
| Final Drive | Chain |
| CHASSIS SPECS | |
| Frame | — |
| Front Suspension | Telescopic fork |
| Rear Suspension | Swing arm, twin shocks, 66 mm / 2.6 in travel |
| Front Brakes | Single leading shoe drum |
| Rear Brakes | 130 mm drum |
| DIMENSION SPECS | |
| Overall Length | — |
| Overall Width | — |
| Overall Height | — |
| Seat Height | — |
| Wheelbase | — |
| Ground Clearance | — |
| Dry Weight | 133 kg / 293 lbs |
| Wet Weight | — |
| WHEEL SPECS | |
| Front Tyre | 2.50-18 |
| Rear Tyre | 2.75-18 |
| FUEL SYSTEM | |
| Fuel Capacity | 8.7 Litres / 2.3 US gal |
| Fuel Consumption | 3.0 L/100 km / 78 US mpg (magazine test) |
| Top Speed | approx. 112 km/h / 70 mph |
By 1980 the CB125 was a simple, cheap single-cylinder commuter, and the JX version got mainly cosmetic updates such as new indicators, levers and styling details, along with a switch to CDI ignition. Testers praised its near-80 mpg economy and low price but criticised the weak drum brakes, grabby clutch and short-travel suspension. It still topped out near 70 mph and was one of the last pure small street bikes on sale in the US.
