Yamaha ST125: history, specs, pictures

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Yamaha ST125
Manufacturer
Also called ST 125
Production 1998
Engine
single cylinder, two-stroke
Top Speed 99 mph (160 km/h)
Fuel System carburetor. mikuni
Ignition electronic
Transmission Gear box: 6-speed

Final Drive: chain

Clutch: wet plate
Suspension Front: rwu forks
Rear: monoshock
Brakes Front: single disc. twin piston caliper
Rear: single disc. twin piston caliper
Weight 242.51 pounds (110.0 Kg) (dry),
Recommended Oil Yamalube 10w-40
Fuel Capacity 2.64 Gallon (10.00 Liters)
Fuel Consumption 8.00 liters/100 km (12.5 km/l or 29.40 mpg)
Manuals Service Manual


The Yamaha ST125 was a single cylinder, two-stroke standard produced by Yamaha in 1998. It could reach a top speed of 99 mph (160 km/h).

Engine[edit | edit source]

The engine was a liquid cooled single cylinder, two-stroke. Fuel was supplied via a port control.

Drive[edit | edit source]

The bike has a 6-speed transmission. Power was moderated via the wet plate.

Chassis[edit | edit source]

Stopping was achieved via single disc. twin piston caliper in the front and a single disc. twin piston caliper in the rear. The front suspension was a rwu forks while the rear was equipped with a monoshock. The ST125 was fitted with a 2.64 Gallon (10.00 Liters) fuel tank. The bike weighed just 242.51 pounds (110.0 Kg).