The Yamaha GT80 B motorcycle specifications include a 72 cc (4.39 cu in) engine, a 4-speed gearbox, and a listed weight of 60.3 kg (133 lb).
Key specifications
How the Yamaha GT80 B 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 87% lower than the Yamaha database average. Around the 9th percentile across Yamaha models.
About 68% lighter than the Yamaha database average. Around the 1st percentile across Yamaha models.
About 62% smaller than the Yamaha database average. Around the 7th 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.
72 cc — larger displacement than about 9% of Yamaha models.
60.3 kg — heavier than about 1% of Yamaha models, or lighter than about 99%.
4.9 L — larger than about 7% of Yamaha fuel tanks in this database.
Mechanical overview
Additional useful specifications
| Front tire size | 2.50-15 |
|---|---|
| Rear tire size | 2.75-14 |
| Bore/stroke ratio | 1.12:1 (Oversquare) |
Model information
| Year released | 1975 |
|---|---|
| Category | Enduro / offroad |
Engine specifications
| Engine type | Single cylinder, two-stroke |
|---|---|
| Displacement | 72 cc (4.39 cu in) |
| Torque | 6.1 Nm (0.6 kgf-m or 4.5 ft.lbs) @ 7,200 rpm |
| Bore × stroke | 47.0 x 42 mm (1.9 x 1.7 inches) |
| Compression ratio | 6.0:1 |
| Cooling system | Air |
| Fuel system | Carburettor. Teikei |
| Ignition | Points type Ignition |
| Starter | Kick |
| Lubrication | Auto Lube |
Transmission and drivetrain
| Gearbox | 4-speed |
|---|---|
| Final drive | Chain (final drive) |
| Clutch | Wet plate |
Chassis and suspension
| Frame | Steel |
|---|---|
| Front suspension | Inverted forks |
| Rear suspension | non-adjustable dual shock |
| Front wheel travel | 102 mm (4.0 inches) |
| Rear wheel travel | 76 mm (3.0 inches) |
| Rake | 32.0° |
Brakes, wheels and tires
| Front brakes | Expanding brake (drum brake) |
|---|---|
| Rear brakes | Expanding brake (drum brake) |
| Front tire | 2.50-15 |
| Rear tire | 2.75-14 |
Dimensions and weight
| Wet weight | 60.3 kg (133 lb) |
|---|---|
| Dry weight | 59 kg (130 lb) |
Fuel and emissions
| Fuel capacity | 4.92 L (1.30 US gal) |
|---|
Performance
| Top speed | 91.0 km/h (56.5 mph) |
|---|---|
| Power/weight ratio | 0.0831 hp/kg |
Other specifications
| Color options | White/Competition Yellow |
|---|---|
| Exhaust system | Single tuned 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.