AMF Harley-Davidson SXT-125


General Information
Years built: 1975, 1976, 1977
Bikes produced:  
Price in 1977 (Germany): 2669 D-Mark
Frame: Double downtube
Vehicle Ident. # (VIN): 3F

Engine

Model designation letter: SXT
Type: 2 cycle, single cylinder, air cooled
Bore: 56 mm
Stroke: 50 mm
Piston displacement: 123 cc
Compression ratio: 10.8:1
Top Speed: 104 km/h
Power Output: 13 PS @ 7000 U/min
Lubrication system: Fuel and oil mixture
Starter system: Primary kick

Ignition System
Type:  
Ignition timing:  
Trigger air gap:  
Spark plug: Champion No. 3
Spark plug electrode gap:  

Dimensions and Weight
Overall length: 81.9 inches
Handlebar width:  
Ground clearance: 8.6 inches
Wheelbase: 53.5 inches
Seats: 2 persons
Seat height: 29.5 inches
Dry weight: 110 kg
Max. weight loaded: 275 kg
Steering angle:  
Steering Head angle:  
Trail:  
Front suspension: Ceriani
Rear suspension: 3-way adjustable
Fuel tank: 10.5 liters (2.8 US gallons)
Oil Tank:  
Transmission:  
Front fork:  

Transmission System:
Clutch: wet, multi plate
Primary drive pinion gear:  
Primary drive crown wheel gear:  
Primary reduction:  
Gear ratios: 1st: 2.083, 2nd: 1.312 3rd: 0.947, 4th 0.761 5th: 0.608
Gearshift pattern: 1 down - 4 up, left side foot shift
Gearbox sprocket: 14 teeth
Rearwheel sprocket: 61 teeth
Chain type: Single Chain

Carburetor
Type: Dell'Orto VHB 27 AD
Venturi dia.: 27 mm
Main jet: 90
Pilot jet:  
Starting jet:  
Throttle valve:  
Jet needle:  
Needle jet:  
Air screw setting:  
Air filter:  

Wheels and Brakes

Front wheel tire: 3.00-19
Rear wheel tire: 3.50-18
Front brake: internal expanding, single leading shoe, 135 mm (5.3 inches)
Rear brake: internal expanding, single leading shoe, 135 mm (5.3 inches)
Rims: Front: 1.6 x 19, rear: 1.86 x 18
Spokes: 36 spokes (front and rear)
Tire pressure:  

The SXT-125 is equipped with battery, coil, headlight, taillight, stoplight, horn and turnsignals. It's street legal in Europe and the USA.
The bike is often mixed up with the earlier TX-125 or SX-125. One reason for the mix up is the "SX-125 eagle-logo" on the exhaust shield instead of a "SXT-125 logo" by factory.
It also uses the same designation "3F" in the VIN as earlier 125cc bikes.

The SXT-125 basically uses the same engine as the earlier 125cc bikes but now equipped with a aluminum cylinder with a hardcoated barrel. The bike does have a seperate plastic reservoir for two stroke oil mounted beneath the gas tank. There is also an automatic oil pump for oil mixture hidden behind a cover on the ride side of the engine. While the SXT-125 is a dirt bike with its high exhaust, it has a very similar brother the street version "SS-125" which differs mainly in a lower chrome exhaust.

The second pictures shows a 1976 "Olympia". Harley-Davidson was one of the official suppliers for the Olympic Games in Montreal (1976). Support workers on site were provided with these sponsor bikes. The Olympic bikes were painted red with the Olympic rings logo on top of the gas tank.

Picture 1: 1975 SXT-125
Pictures 6-7: Fully restored 1976 SXT-125 located in Finland. Thanks to Viitala for sharing.


SXT-125, 197501 SXT-125 Olympia02 1977 SXT-125 Raphael France03 1977 SXT-125 Raphael France04
SXT Frame05 SXT-125, Finland06 SXT-125, Finland07

Thanks to Raphael for the pictures of his SXT125 bik
es

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