The first RX 125 was a light, liquid-cooled two-stroke enduro that put Aprilia into the 125 cc off-road class in the early 1980s.
| MODEL | APRILIA RX 125 1983 - 1984 |
| Year | 1983 - 1984 |
| Engine Type | Single cylinder, two-stroke |
| Displacement / Capacity | 124 cc / 7.57 cu in |
| Bore X Stroke | 54 x 54 mm / 2.1 x 2.1 in |
| Compression Ratio | 11.5:1 |
| Cooling System | Liquid cooled |
| Max Power | 24.8 kW / 34 hp @ 10750 rpm |
| Max Torque | — |
| Ignition | — |
| Induction | Carburettor |
| Start System | — |
| TRANSMISSION SPECS | |
| Lubrication | — |
| Gear Box | 6 Speed |
| Clutch | — |
| Final Drive | Chain |
| CHASSIS SPECS | |
| Frame | Steel frame |
| Front Suspension | Telescopic fork |
| Rear Suspension | Swingarm with single shock absorber |
| Front Brakes | Drum |
| Rear Brakes | Drum |
| DIMENSION SPECS | |
| Overall Length | — |
| Overall Width | — |
| Overall Height | — |
| Seat Height | — |
| Wheelbase | — |
| Ground Clearance | 300 mm |
| Dry Weight | 91 kg / 200.6 lbs |
| Wet Weight | — |
| WHEEL SPECS | |
| Front Tyre | 3.00-21 |
| Rear Tyre | 4.00-18 |
| FUEL SYSTEM | |
| Fuel Capacity | 8.5 Litres / 2.25 US gal |
| Fuel Consumption | — |
| Top Speed | 130 km/h / 80.8 mph |
The first RX 125 was a light, liquid-cooled two-stroke enduro that put Aprilia into the 125 cc off-road class in the early 1980s. It was simple by later standards, with drum brakes at both ends, a conventional telescopic fork and a single rear shock, but at about 91 kg and with a six-speed gearbox it was a lively trail and competition-style machine for young riders.
