The Harley-Davidson SX 125 motorcycle specifications include a 123 cc (7.51 cu in) engine, a 5-speed gearbox, and a listed weight of 112 kg (246.9 lb).
Key specifications
How the Harley-Davidson SX 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 90% lower than the Harley-Davidson database average. Around the 1st percentile across Harley-Davidson models.
About 64% lighter than the Harley-Davidson database average. Around the 1st percentile across Harley-Davidson models.
About 38% smaller than the Harley-Davidson database average. Around the 11th 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.
123 cc — larger displacement than about 1% of Harley-Davidson models.
112 kg — heavier than about 1% of Harley-Davidson models, or lighter than about 99%.
10.5 L — larger than about 11% of Harley-Davidson fuel tanks in this database.
Mechanical overview
Additional useful specifications
| Front tire size | 3.00-19 |
|---|---|
| Rear tire size | 3.50-18 |
| Bore/stroke ratio | 1.12:1 (Oversquare) |
Model information
| Year released | 1976 |
|---|---|
| Category | Enduro / offroad |
Engine specifications
| Engine type | Single cylinder, two-stroke |
|---|---|
| Displacement | 123 cc (7.51 cu in) |
| Bore × stroke | 56.0 x 50 mm (2.2 x 2.0 inches) |
| Compression ratio | 10.8:1 |
| Cooling system | Air |
| Fuel control | Port control |
Transmission and drivetrain
| Gearbox | 5-speed |
|---|---|
| Final drive | Chain (final drive) |
Brakes, wheels and tires
| Front brakes | Expanding brake |
|---|---|
| Rear brakes | Expanding brake |
| Front tire | 3.00-19 |
| Rear tire | 3.50-18 |
Dimensions and weight
| Wet weight | 112 kg (246.9 lb) |
|---|
Fuel and emissions
| Fuel capacity | 10.50 L (2.77 US gal) |
|---|
Performance
| Top speed | 105.0 km/h (65.2 mph) |
|---|
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.