Yamaha GT80: history, specs, pictures

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1973-Yamaha-GTMX-Silver-5282-0.jpg
Yamaha GT80
Manufacturer
Also called GT80/MX
Production 1973 - 1980
Class Enduro
Engine
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

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

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

Chassis

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



1978


1980

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



1981

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


References

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