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Yamaha AT1-B Official poster & SpecificationsTechnical Specifications of Yamaha AT1 125cc

The Yamaha AT1 was a single cylinder dual-sport / enduro bike made by Yamaha Motor Company from 1969 to 1971.

There were three main modifications made to the Yamaha AT1, each corresponding to the year of the production. The original model was 1969 Yamaha AT1, followed by Yamaha AT1B in 1970 and finally Yamaha AT1C in 1971. A Motocross edition, marked with suffix "M" was also introduced each year. The M or MX models were lighter and had several performance enhancing modifications, such as higher compression ratio, larger carburetor, tuned exhaust etc.

Model: Yamaha AT1 125

Versions: Yamaha AT1 (100101-119829), Yamaha AT1B (120101-138890), Yamaha AT1M (300101-303790), Yamaha AT1MX (310101-312326), Yamaha AT1C (139101-162879), Yamaha AT1M-C (313101-317191)

Year: 1969-71

Motorcycle Type: Dual sport / Enduro

Dry weight: 94.0 kg

Ground clearance: 225 mm (8.85 inches)

Fuel tank size: 7.2 litres (1.6 gallons)

Colour options: Pearl White, Competition Yellow, Brilliant Red


Engine, Intake & Transmission

Displacement: 123 cc

Engine: Single, two-stroke

Top speed: 97 km/h (60 mph)

Fuel system: Carburettor

Fuel control: Port control

Ignition: Points

Lubrication system: Autolube

Cooling system: Air cooled

Gearbox: 5-speed

Transmission: Wet, multiple disc with Chain

Start up: Electric start & Kick-start


Chassis, suspension, brakes and wheels

Frame type: Steel tube – double tubular cradle

Front suspension: Hydraulic telescopic fork

Rear suspension: Twin shocks

Front brakes: Drum brake

Rear brakes: Drum brake