The Yamaha AS1 motorcycle specifications include a 125 cc (7.63 cu in) engine, power of 15 hp (10.9 kW) @ 8,500 rpm, a 5-speed gearbox, and a listed weight of 98 kg (216 lb).
Key specifications
How the Yamaha AS1 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 72% lower than the Yamaha database average. Around the 28th percentile across Yamaha models.
About 77% lower than the Yamaha database average. Around the 25th percentile across Yamaha models.
About 27% smaller than the Yamaha database average. Around the 31st 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.
15 hp — more powerful than about 28% of Yamaha models with power data.
125 cc — larger displacement than about 25% of Yamaha models.
9.5 L — larger than about 31% 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.
1,854
2,082
11% below average.
671
823
18% below average.
1,011
1,172
14% below average.
1,072
1,416
24% below average.
150
181
17% below average.
Mechanical overview
Additional useful specifications
| Front tire size | -2.50-18 |
|---|---|
| Power-to-weight ratio | 0.153 hp/kg |
| Power-to-weight | 153.1 hp/tonne |
| Specific power | 120.0 hp/L |
| Bore/stroke ratio | 1.00:1 (Square) |
Model information
| Year released | 1968 |
|---|---|
| Category | Sport touring |
Engine specifications
| Engine type | Twin, two-stroke |
|---|---|
| Displacement | 125 cc (7.63 cu in) |
| Power | 15 hp (10.9 kW) @ 8,500 rpm |
| Torque | 12.7 Nm (1.3 kgf-m or 9.4 ft.lbs) @ 8,000 rpm |
| Bore × stroke | 43.0 x 43 mm (1.7 x 1.7 inches) |
| Compression ratio | 7.0:1 |
| Cooling system | Air |
| Fuel system | Carburettor |
| Fuel control | Port control |
| Ignition | Points |
| Lubrication | Autolube |
Transmission and drivetrain
| Gearbox | 5-speed |
|---|---|
| Final drive | Chain (final drive) |
Chassis and suspension
| Frame | Steel tube |
|---|---|
| Front suspension | Telescopic |
| Rear suspension | Swinging arm, coil spring oil damper |
Brakes, wheels and tires
| Front brakes | Expanding brake (drum brake). single leading shoe |
|---|---|
| Rear brakes | Expanding brake (drum brake) |
| Front tire | -2.50-18 |
Dimensions and weight
| Dry weight | 98 kg (216 lb) |
|---|---|
| Overall length | 1,854 mm (73.0 inches) |
| Overall width | 671 mm (26.4 inches) |
| Overall height | 1,011 mm (39.8 inches) |
| Wheelbase | 1,072 mm (42.2 inches) |
| Ground clearance | 150 mm (5.9 inches) |
Fuel and emissions
| Fuel capacity | 9.46 L (2.50 US gal) |
|---|
Performance
| Top speed | 120.7 km/h (75.0 mph) |
|---|---|
| Power/weight ratio | 0.1531 hp/kg |
Other specifications
| Color options | Blue or red |
|---|---|
| Exhaust system | Twin chrome |
| Comments | Great classic |
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.