Aprilia ST125 Make Model. | Aprilia ST 125 | Year | 1982 - 84 | Engine | Two stroke, single cylinder | Capacity | 124 cc / 7.6 cu in | Bore x Stroke | 52.8 mm x 57mm | Compression Ratio | 14.5:1 | Cooling System | Liquid cooled | Induction | ?28 mm Dell'Orto PHBH AS | Ignition | Electronic | Battery | 12V 5.5 Ah | Generator | 130W | Starting | Kick | Clutch | Multi-disc oil bath | Max Power | 13.8 Nm / 18.5 hp @ 8250 rpm | Transmission | 6 Speed | Final Drive | Chain | Frame | Double cradle tubular steel | Front Suspension | Marzocchi ?32mm fork. non-adjustable | Rear Suspension | Swingarm with single shock absorber | Front Brakes | Single ?230 mm disc | Rear Brakes | ?160mm drum | Front Wheel | 2.75-18 | Rear Wheel | 3.00-18 | Seat Height | 800 mm / 31.5 in | Dry Weight | 104 kg / 229 lbs | Top Speed | 126.8 km/h / 78.8 mph | Overview The first road Aprilia chassis is a conventional double-cradle tubular closed with substantial reinforcements behind the headstock. If the 32mm Marzocchi fork is rather conventional, the same can not be said for the rear swingarm suspension with single shock absorber called progressive Sebach APS (Aprilia Progressive System). The system, first case among 125 Italian road, was born from the experience of Venetian house and it was certainly a novelty for the sixteen year olds. The brakes use the proven solution front disc / rear drum. The front brake system is a stndard production Grimeca.
Engine
The motor produced by Japan's Hiro (partner Aprilia mid 70s) is a direct evolution of the excellent motor manufactured for off-road models, but extensively reworked for this new role and six gear setup.
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