Yamaha GT80: history, specs, pictures

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Yamaha GT80
Also called GT80/MX
Production 1973 - 1980
Class Enduro
single cylinder, two-stroke
Bore / Stroke 47.0mm x 42.0mm
Top Speed 57 mph (91 km/h)
Torque 4.5 ft/lbs (6.1 Nm) @ 7200RPM
Fuel System carburetor. teikei
Ignition points type ignition
Spark Plug NGK B7HS '73-80 [1]
Battery YUASA 6N4-2A-5 '73-80 [1]
Transmission Gear box: 4-speed
Clutch: wet plate
Final Drive Chain: 420x
Suspension Front: inverted forks
Rear: non-adjustable dual shock
Brakes Front: expanding brake (drum brake)
Rear: expanding brake (drum brake)
Front Tire 2.50-15 '73-80 [1]
Rear Tire 2.75-14 '73-80 [1]
Weight 130.07 pounds (59.0 Kg) (dry), 60.3 kg (wet)
Recommended Oil Yamalube 10w-40
Fuel Capacity 1.3 Gallon (4.92 Liters)
Manuals Service Manual

The Yamaha GT80 B was a single cylinder, two-stroke standard produced by Yamaha in 1975. It could reach a top speed of 57 mph (91 km/h). Max torque was 4.5 ft/lbs (6.1 Nm) @ 7200 RPM.

Engine[edit | edit source]

The engine was a air cooled single cylinder, two-stroke. A 47.0mm bore x 42.0mm stroke result in a displacement of just 72.0 cubic centimeters.

Drive[edit | edit source]

The bike has a 4-speed transmission. Power was moderated via the wet plate.

Chassis[edit | edit source]

It came with a 2.50-15 front tire and a 2.75-14 rear tire. Stopping was achieved via expanding brake (drum brake) in the front and a expanding brake (drum brake) in the rear. The front suspension was a inverted forks while the rear was equipped with a non-adjustable dual shock. The GT80 B was fitted with a 1.3 Gallon (4.92 Liters) fuel tank. The bike weighed just 130.07 pounds (59.0 Kg).

1973[edit | edit source]

1978[edit | edit source]

1980[edit | edit source]

1980 Yamaha GT80 in Red
1980 Yamaha GT80 in Red
1980 Yamaha GT80 in Red

1981[edit | edit source]

1981 Yamaha GT80 in Blue
1981 Yamaha GT80 in Blue
1981 Yamaha GT80 in Blue
1981 Yamaha GT80 in Blue

References[edit | edit source]

  1. 1.0 1.1 1.2 1.3 2019 Western Power Sports Catalog. Western Power Sports. 2019.