The Harley-Davidson S-125 motorcycle specifications include a 125 cc (7.63 cu in) engine, power of 3 hp (2.2 kW), a 3-speed gearbox, and a listed weight of 90.7 kg (200 lb).
Key specifications
The 1948 model is treated as the standard specification. Only later model years with a different supplied value are shown below.
How the Harley-Davidson S-125 compares
This compares the motorcycle with all Harley-Davidson models in this specifications database. The blue marker is this model and the grey line is the Harley-Davidson database average.
About 95% lower than the Harley-Davidson database average. Around the 1st percentile across Harley-Davidson models.
About 90% lower than the Harley-Davidson database average. Around the 1st percentile across Harley-Davidson models.
About 61% smaller than the Harley-Davidson database average. Around the 1st percentile across Harley-Davidson models.
Harley-Davidson database percentile rankings
Percentiles show where this motorcycle sits across the Harley-Davidson specifications database. They are descriptive database rankings, not performance ratings.
3 hp — more powerful than about 1% of Harley-Davidson models with power data.
125 cc — larger displacement than about 1% of Harley-Davidson models.
6.6 L — larger than about 1% of Harley-Davidson fuel tanks in this database.
Mechanical overview
Additional useful specifications
| Front tire size | 3.25-19 |
|---|---|
| Rear tire size | 3.25-19 |
| Power-to-weight ratio | 0.033 hp/kg |
| Power-to-weight | 33.1 hp/tonne |
| Specific power | 24.0 hp/L |
| Bore/stroke ratio | 0.90:1 (Undersquare) |
Model information
| Category | Allround |
|---|
Engine specifications
| Engine type | Single cylinder, two-stroke |
|---|---|
| Displacement | 125 cc (7.63 cu in) |
| Power | 3 hp (2.2 kW) |
| Bore × stroke | 52.0 x 58 mm (2.0 x 2.3 inches) |
| Compression ratio | 6.6:1 |
| Cooling system | Air |
| Fuel system | Carburettor. Single Langsenkamp-Linkert |
| Starter | Kick |
Transmission and drivetrain
| Gearbox | 3-speed |
|---|---|
| Final drive | Chain (final drive) |
Chassis and suspension
| Frame | Single downtube steel cradle |
|---|---|
| Front suspension | Girder fork coil spring |
| Rear suspension | Rigid- |
Brakes, wheels and tires
| Front brakes | Expanding brake (drum brake). SLS drum front and rear |
|---|---|
| Rear brakes | Expanding brake (drum brake). SLS drum front and rear |
| Front tire | 3.25-19 |
| Rear tire | 3.25-19 |
Dimensions and weight
| Dry weight | 90.7 kg (200 lb) |
|---|
Fuel and emissions
| Fuel capacity | 6.62 L (1.75 US gal) |
|---|
Performance
| Top speed | 72.4 km/h (45.0 mph) |
|---|---|
| Power/weight ratio | 0.0331 hp/kg |
Other specifications
| Seat | Spring-mounted seat |
|---|---|
| Comments | Made in Germany in 1948 following Germany’s defeat in World War II. |
Disclaimer: Specifications may vary by market, trim, production date and optional equipment, and scraped or historical data can contain errors. Comparison and percentile values are calculated from Harley-Davidson models in this specifications database. Always double-check important specifications against the motorcycle owner’s/service manual and official Harley-Davidson information before relying on them. Visit the official Harley-Davidson website.