| MODEL | HARLEY-DAVIDSON SST 250 1974 - 1978 |
| Year | 1974 - 1978 |
| Engine Type | Two stroke, single cylinder |
| Displacement / Capacity | 242.6 cc / 14.8 cu in |
| Bore X Stroke | 72 x 59.6 mm |
| Compression Ratio | 10.3:1 |
| Cooling System | Air cooled |
| Max Power | 12.4 kW / 17 hp @ 7000 rpm |
| Max Torque | — |
| Ignition | Battery and coil, later electronic CDI |
| Induction | 1x 32 mm Dell'Orto carburettor |
| Start System | Kick |
| TRANSMISSION SPECS | |
| Lubrication | — |
| Gear Box | 5 speed |
| Clutch | — |
| Final Drive | Chain |
| CHASSIS SPECS | |
| Frame | — |
| Front Suspension | Ceriani oil-damped telescopic fork |
| Rear Suspension | Swinging arm, Betor dampers, 3-way adjustable |
| Front Brakes | Single disc |
| Rear Brakes | Drum |
| DIMENSION SPECS | |
| Overall Length | — |
| Overall Width | — |
| Overall Height | — |
| Seat Height | — |
| Wheelbase | — |
| Ground Clearance | — |
| Dry Weight | 114 kg / 252 lbs |
| Wet Weight | 129 kg / 284 lbs |
| WHEEL SPECS | |
| Front Tyre | 3.25-19 |
| Rear Tyre | 4.00-18 |
| FUEL SYSTEM | |
| Fuel Capacity | 10.5 Litres / 2.7 US gal |
| Fuel Consumption | 45 mpg |
| Top Speed | 137 km/h / 85 mph |
Built by Aermacchi in Varese, the 250 two-stroke street single replaced the four-stroke Sprint in Harley's small-bike range. It was the low-pipe road twin of the SX 250 trail bike, with a five-speed box and a front disc. Testers rated its low-down pull, handling and brakes, but sales were weak and the line ended when Harley sold the factory to Cagiva in 1978.
