The Yamaha RX 125 motorcycle specifications include a 125 cc (7.63 cu in) engine, a 5-speed gearbox, and a listed weight of 96 kg (211.6 lb).
Key specifications
How the Yamaha RX 125 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 77% lower than the Yamaha database average. Around the 25th percentile across Yamaha models.
About 23% smaller than the Yamaha database average. Around the 35th 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.
125 cc — larger displacement than about 25% of Yamaha models.
10 L — larger than about 35% 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.
1,915
2,082
8% below average.
730
823
11% below average.
1,060
1,172
10% below average.
1,240
1,416
12% below average.
160
181
11% below average.
Mechanical overview
Additional useful specifications
| Front tire size | 3.00-18 |
|---|---|
| Rear tire size | 3.00-18 |
| Bore/stroke ratio | 1.12:1 (Oversquare) |
Model information
| Year released | 1979 |
|---|
Engine specifications
| Engine type | Single cylinder, two-stroke |
|---|---|
| Displacement | 125 cc (7.63 cu in) |
| Torque | 13.3 Nm (1.4 kgf-m or 9.8 ft.lbs) @ 7,000 rpm |
| Bore × stroke | 56.0 x 50 mm (2.2 x 2.0 inches) |
| Compression ratio | 6.9:1 |
| Cooling system | Air |
| Fuel system | Carburettor. Mikuni VM24SH |
| Fuel control | Port control |
| Ignition | Magneto |
| Starter | Kick |
| Lubrication | Autolube |
Transmission and drivetrain
| Gearbox | 5-speed |
|---|---|
| Final drive | Chain (final drive) |
Chassis and suspension
| Frame | Painted tubular steel |
|---|---|
| Front suspension | Telescopic forks |
| Rear suspension | Swing arm twin shocks |
Brakes, wheels and tires
| Front brakes | Single disc |
|---|---|
| Rear brakes | Expanding brake (drum brake) |
| Front tire | 3.00-18 |
| Rear tire | 3.00-18 |
Dimensions and weight
| Dry weight | 96 kg (211.6 lb) |
|---|---|
| Overall length | 1,915 mm (75.4 inches) |
| Overall width | 730 mm (28.7 inches) |
| Overall height | 1,060 mm (41.7 inches) |
| Wheelbase | 1,240 mm (48.8 inches) |
| Ground clearance | 160 mm (6.3 inches) |
Fuel and emissions
| Fuel capacity | 10.00 L (2.64 US gal) |
|---|
Performance
| Power/weight ratio | 0.1354 hp/kg |
|---|
Other specifications
| Color options | Red/black |
|---|---|
| Exhaust system | Single chrome pipe |
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.