The 2005 Tuono 125 was the last run of the two-stroke version, still essentially an RS 125 with a nose fairing and flat bars instead of clip-ons.
| MODEL | APRILIA TUONO 125 2005 |
| Year | 2005 |
| Engine Type | Two stroke, single cylinder |
| Displacement / Capacity | 124.8 cc / 7.6 cu in |
| Bore X Stroke | 54 x 54.5 mm |
| Compression Ratio | 12.5:1 |
| Cooling System | Liquid cooled |
| Max Power | 14 hp |
| Max Torque | 16.25 Nm / 1.66 kgf-m / 12 lb-ft |
| Ignition | CDI electronic ignition |
| Induction | 28 mm Dell'Orto PHBH 28 BD carburettor |
| Start System | Electric |
| TRANSMISSION SPECS | |
| Lubrication | — |
| Gear Box | 6 speed |
| Clutch | Wet multi-plate (oil bath) |
| Final Drive | Chain |
| CHASSIS SPECS | |
| Frame | Cast aluminium sloping twin-spar with thin-walled structural shell and cross-rib reinforcement |
| Front Suspension | 40 mm upside-down hydraulic telescopic fork, 120 mm wheel travel |
| Rear Suspension | Cast aluminium asymmetric swingarm, hydraulic monoshock with adjustable spring preload, 120 mm wheel travel |
| Front Brakes | Single 320 mm disc, 4 piston caliper |
| Rear Brakes | Single 220 mm disc, 2 piston caliper |
| DIMENSION SPECS | |
| Overall Length | — |
| Overall Width | — |
| Overall Height | — |
| Seat Height | 805 mm / 31.7 in |
| Wheelbase | 1345 mm / 53.0 in |
| Ground Clearance | — |
| Dry Weight | 122 kg / 269 lbs |
| Wet Weight | — |
| WHEEL SPECS | |
| Front Tyre | 110/70-17 |
| Rear Tyre | 150/60-17 |
| FUEL SYSTEM | |
| Fuel Capacity | 14 Litres / 3.7 US gal |
| Fuel Consumption | — |
| Top Speed | 130 km/h / 81 mph |
The 2005 Tuono 125 was the last run of the two-stroke version, still essentially an RS 125 with a nose fairing and flat bars instead of clip-ons. It kept the RS chassis, Brembo-equipped 320 mm front disc and upside-down fork, which made it one of the sharpest-handling learner bikes of its day. In many markets it was sold restricted to learner-legal power, and owners often de-restricted it for a big jump in performance.
