Harley-Davidson SX125: history, specs, pictures

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Harley-Davidson SX125
Also called SX 125, SXT125, SXT 125
Production 1975 - 1977
single cylinder, two-stroke
Bore / Stroke 56.0mm x 50.0mm
Top Speed 65 mph (105 km/h)
Horsepower 12.74 HP (9.5 KW) @ 7000RPM
Transmission Gear box: 5-speed
Final Drive: chain
Brakes Front: expanding brake
Rear: expanding brake
Front Tire 3.00-19
Rear Tire 3.50-18
Weight 112.0 kg (wet)
Fuel Capacity 2.77 Gallon (10.50 Liters)
Related Harley-Davidson SX125
Harley-Davidson SX175
Harley-Davidson SX250
Competition Honda XL125, Kawasaki KS125
Manuals Service Manual

The Harley-Davidson SXT125 was a single cylinder, two-stroke standard produced by Harley-Davidson between 1975 and 1977. It could reach a top speed of 65 mph (105 km/h). Claimed horsepower was 12.74 HP (9.5 KW) @ 7000 RPM.


The engine was a air cooled single cylinder, two-stroke. A 56.0mm bore x 50.0mm stroke result in a displacement of just 123.0 cubic centimeters. Fuel was supplied via a port control.


The bike has a 5-speed transmission.


It came with a 3.00-19 front tire and a 3.50-18 rear tire. Stopping was achieved via expanding brake in the front and a expanding brake in the rear. The SXT125 was fitted with a 2.77 Gallon (10.50 Liters) fuel tank.

1975 Harley Davidson SX 125[edit]

1975 Harley Davidson SX 125

The Harley Davidson SX 125 featured an air-cooled, two-stroke, 125cc, single cylinder paired to a five-speed manual transmission. It comes standard with laced wheels, dual shocks as a rear suspension, a dual seat, and a drum braking system. In addition to the small engine, it comes with a 10 liter fuel tank, plus it tips the scale at only 112 kg, making it one of the lightest and fuel-efficient machines from House Milwaukee ever to be produced.