| MODEL | HONDA SL 125 1971 - 1974 |
| Year | 1971 - 1974 |
| Engine Type | Four stroke, single cylinder, OHC, 2 valves |
| Displacement / Capacity | 122 cc / 7.4 cu in |
| Bore X Stroke | 56.0 x 49.5 mm |
| Compression Ratio | 9.5:1 |
| Cooling System | Air cooled |
| Max Power | 8.8 kW / 12 hp @ 9700 rpm |
| Max Torque | — |
| Ignition | Points and condenser |
| Induction | Keihin carburettor |
| Start System | Kick |
| TRANSMISSION SPECS | |
| Lubrication | Wet sump |
| Gear Box | 5 speed |
| Clutch | Wet plate, manual |
| Final Drive | Chain, 428 x 110 |
| CHASSIS SPECS | |
| Frame | — |
| Front Suspension | — |
| Rear Suspension | Dual shocks |
| Front Brakes | Drum |
| Rear Brakes | Drum |
| DIMENSION SPECS | |
| Overall Length | — |
| Overall Width | — |
| Overall Height | — |
| Seat Height | — |
| Wheelbase | — |
| Ground Clearance | — |
| Dry Weight | — |
| Wet Weight | 108 kg / 238.1 lbs |
| WHEEL SPECS | |
| Front Tyre | 2.75-21 |
| Rear Tyre | 3.25-18 |
| FUEL SYSTEM | |
| Fuel Capacity | 7.5 Litres / 1.98 US gal |
| Fuel Consumption | — |
| Top Speed | 102 km/h / 63.4 mph |
The SL125 was one of Honda's first proper four-stroke trail bikes, using a 21-inch front and 18-inch rear wheel with a 122 cc overhead-cam single and five-speed gearbox. Its engine was known for being reliable, quiet and willing, and the low weight helped, though the suspension was basic by later standards. Yearly changes were mostly paint and decals, and the later XL series improved on its forks and rear suspension.
