Aprilia AS 125R


Make Model.

Aprilia AS 125R




Two stroke, single cylinder


124 cc / 7.6 cu in
Bore x Stroke 54 mm x 54 mm
Compression Ratio 14.2:1
Cooling System Liquid cooled


Dell'Orto PHBH AS 26 mm carburetor




Electric and kick
Clutch Multi-disc oil bath

Max Power

19.4 kW / 26 hp @ 8500 rpm


6 Speed

Final Drive

Frame Double cradle tubular steel

Front Suspension

Marzocchi 32 mm, non-adjustable

Rear Suspension

Swingarm with single shock absorber

Front Brakes

Single 240 mm disc

Rear Brakes

Single 230 mm disc

Front Tyre

100-90 -16

Rear Tyre

100-90 -18
Wheelbase 1365 mm / 53.7 in
Seat Height 800mm / 31.5 in

Dry Weight

117 kg / 258 lbs

Top Speed

145 km/h / 90 mph

Presented in Gardone Riviera in May 1985 and sold soon after, the AS 125 R, where R indicates the presence of the new Austrian Rotax engine instead of the previous Hiro, is like his ancestor ST 125 of 1983.. The AS-R can indeed be called a slight evolution of the previous ST and STX models with regard to aesthetics and cycling, although the new Rotax engine is totally new. Characterized by the presence of the exhaust valve and RAVE (Regulation Aprilia Exhaust Valve), the modern engine Rotax 127 provides outstanding performance that transform the leadership of the AS-R, making it not only more robust but also more mature tha its ancestor STX. The AS-R is therefore a more powerful bike and most of STX fun to drive, though not as refined as the Honda NS-F is regarded a the best 125 of 1985.

Curiously enough for Aprilia, the AS-R proves long-lived enough to stay in production throughout 1986 without any special changes, just long enough for men of Aprilia to present the revolutionary Aprilia AF1 Project 108, 1987.

Price in 1985: Lire 3,430,000 turnkey.

Available colors: red / gray. (Other colors were available, but still to be confirmed)