In the 70’s and early 80’s Aprilia was mainly known for its small capacity and competition off-road motocross bikes, then at the Milan Motor Show in 1981 Aprilia debuted the all new ST125 (Strada) road bike to excited crowds.
On sale in late 82, but categorised as a 83 model, the ST featured a single cylinder liquid cooled 2 stroke engine produced by Italian company Hiro Motori. Design wise it leant on Italian market bikes such as the HRD and Malanca and also Japanese bikes such as the Yamaha RD/ Kawasaki AR models of the era. The Hiro motor was pre-mix only for 2 stroke oil, maybe this was due to its motocross based engine.
For 1984 the ST remained in production alongside the new updated STX 125 model which featured a nose fairing and auto-lube, with the ST gaining the auto lube and is recognisable by its Aprilia-branded crankcases. As with the STX, the ST had a new exhaust system with a separate silencer end-can was used in 1984, replacing the long black pipe.
The last evolution of the ST came in 1985 with the AS125R, this model featured a significant upgrade in the form of a Rotax 127 engine with the RAVE powervalve, and a large jump in performance.
The ST 125 was identified by the type code ST 125 and had DGM 50803. Chassis specification: 32 mm Marzocchi fork
APS (Aprilia Progressive System) with Sebac rear shock
Grimeca hydraulic twin piston front brake with 240 mm disc and a 160 mm drum at the rear.
18” wheels Engine specification: The engine was produced by the Italian company Hiro Motori s.a.s.
Reed valve intake system called H.I.S. (Hiro Induction System).
Forced circulation liquid cooling
Dell’Orto PHBH 28 AS carburetor.
Six-speed transmission.
Maximum power: 18.07 hp at 8250 rpm
Top speed of 126.8 km/h (78.78mph)
400-meter acceleration tests from 50 km/h (31mph), 23.7 seconds/ 98.800 km/h (61.39mph)
The ST 125 was identified by the type code ST 125 and had DGM 50803. Chassis specification: 32 mm Marzocchi fork
APS (Aprilia Progressive System) with Sebac rear shock
Grimeca hydraulic twin piston front brake with 240 mm disc and a 160 mm drum at the rear.
18” wheels Engine specification: The engine was produced by the Italian company Hiro Motori s.a.s.
Reed valve intake system called H.I.S. (Hiro Induction System).
Forced circulation liquid cooling
Dell’Orto PHBH 28 AS carburetor.
Six-speed transmission.
Maximum power: 18.07 hp at 8250 rpm
Top speed of 126.8 km/h (78.78mph)
400-meter acceleration tests from 50 km/h (31mph), 23.7 seconds/ 98.800 km/h (61.39mph)
Brochure translation:
The 125 ST APRILIA is a motorcycle that goes beyond conventional, focussing on himself the skills of a Gran Turismo and a Sports Car. Elegance of lines, absence of vibrations, comfort, fluidity of driving and low consumption blend perfectly with speed, recovery, road holding, braking and safety.
The liquid-cooled engine with internal circulation pump, allows homogeneity of temperature, consistency of performance and maximum noise containment. The front fork with advanced stud and the Mono-shock absorber rear with A.P.S. system (April Progressive System) they guarantee driving comfort and safety in curves with any background. The upgraded electrical system, equipped with a 130W generator with all battery services, offers greater lighting power, as well as supply consistency even at low rotation speeds, ensuring more safety in night driving.
The saddle is foldable with a safety lock to access the object compartment. The instrumentation ideally positioned and also equipped with a "fuel reserve light" is truly functional and complete. In this way it allows constant control of every part of the bike without creating problems or distractions driving.
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