The Yamaha DT 125 MX motorcycle specifications include a 123 cc (7.51 cu in) engine, power of 14 hp (10.2 kW) @ 7,000 rpm, a 6-speed gearbox, and a listed weight of 102 kg (224.9 lb).
Key specifications
How the Yamaha DT 125 MX compares
This compares the motorcycle with all Yamaha models in this specifications database. The blue marker is this model and the grey line is the Yamaha database average.
About 74% lower than the Yamaha database average. Around the 24th percentile across Yamaha models.
About 78% lower than the Yamaha database average. Around the 13th percentile across Yamaha models.
About 45% lighter than the Yamaha database average. Around the 12th percentile across Yamaha models.
About 7% taller than the Yamaha database average. Around the 81st percentile across Yamaha models.
About 46% smaller than the Yamaha database average. Around the 20th percentile across Yamaha models.
Yamaha database percentile rankings
Percentiles show where this motorcycle sits across the Yamaha specifications database. They are descriptive database rankings, not performance ratings.
14 hp — more powerful than about 24% of Yamaha models with power data.
123 cc — larger displacement than about 13% of Yamaha models.
102 kg — heavier than about 12% of Yamaha models, or lighter than about 88%.
845 mm — taller than about 81% of Yamaha models.
7 L — larger than about 20% of Yamaha fuel tanks in this database.
Dimensions compared with Yamaha average
Each measurement is compared with the average value across Yamaha models where that dimension is available.
2,085
2,082
Close to average.
865
823
5% above average.
1,120
1,172
4% below average.
845
793
7% above average.
265
181
47% above average.
Mechanical overview
Additional useful specifications
| Front tire size | 2.75-21 |
|---|---|
| Rear tire size | 3.00-18 |
| Engine oil capacity | 1.00 L (1.06 US qt) |
| Power-to-weight ratio | 0.137 hp/kg |
| Power-to-weight | 137.3 hp/tonne |
| Specific power | 113.8 hp/L |
| Bore/stroke ratio | 1.12:1 (Oversquare) |
Model information
| Year released | 1978 |
|---|---|
| Category | Enduro / offroad |
Engine specifications
| Engine type | Single cylinder, two-stroke |
|---|---|
| Displacement | 123 cc (7.51 cu in) |
| Power | 14 hp (10.2 kW) @ 7,000 rpm |
| Torque | 9.8 Nm (1.0 kgf-m or 7.2 ft.lbs) @ 6,500 rpm |
| Bore × stroke | 56.0 x 50 mm (2.2 x 2.0 inches) |
| Cooling system | Air |
| Fuel system | Carburettor. Mikuni VM 24 SH |
| Fuel control | Membrane |
| Starter | Kick |
| Lubrication | Autolube |
| Oil capacity | 1.00 L (1.06 US qt) |
Transmission and drivetrain
| Gearbox | 6-speed |
|---|---|
| Final drive | Chain (final drive) |
Chassis and suspension
| Front suspension | Hydraulic telescopic fork |
|---|---|
| Rear suspension | Monocross |
| Front wheel travel | 180 mm (7.1 inches) |
| Rear wheel travel | 145 mm (5.7 inches) |
| Rake | 30.0° |
Brakes, wheels and tires
| Front brakes | Expanding brake (drum brake) |
|---|---|
| Rear brakes | Expanding brake (drum brake) |
| Front tire | 2.75-21 |
| Rear tire | 3.00-18 |
Dimensions and weight
| Wet weight | 102 kg (224.9 lb) |
|---|---|
| Dry weight | 95 kg (209.4 lb) |
| Seat height | 845 mm (33.3 inches) |
| Overall length | 2,085 mm (82.1 inches) |
| Overall width | 865 mm (34.1 inches) |
| Overall height | 1,120 mm (44.1 inches) |
| Ground clearance | 265 mm (10.4 inches) |
Fuel and emissions
| Fuel capacity | 7.00 L (1.85 US gal) |
|---|---|
| Reserve fuel capacity | 1.00 L (0.26 US gal) |
Performance
| Top speed | 110.0 km/h (68.4 mph) |
|---|---|
| Power/weight ratio | 0.1474 hp/kg |
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 Yamaha models in this specifications database. Always double-check important specifications against the motorcycle owner’s/service manual and official Yamaha information before relying on them. Visit the official Yamaha website.