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Aprilia STX 125

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Make Model

Aprilia STX 125

Year

1984

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

Ø28 mm Dell'Orto PHBH AS

Ignition

Electronic

Starting

Kick
Clutch Multi-disc oil bath

Max Power

13.8 kW kW / 18.5 hp @ 8000 rpm

Transmission

6 Speed

Final Drive

Chain
Frame Double cradle tubular steel

Rake

28.5°

Trail

87 mm / 3.4 in

Front Suspension

Marzocchi Ø32 mm fork, non-adjustable

Rear Suspension

Swingarm with single shock absorber

Front Brakes

Single Ø240 mm disc

Rear Brakes

Ø160 mm Drum

Front Tyre

100-90 -16

Rear Tyre

100-90 -18
Dimensions Length: 1370 mm / 53.9 in
Seat Height 800mm / 31.5 in

Dry Weight

113 kg / 249 lbs

Top Speed

130 km/h / 81 mph
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Overview

Presented at the Milan Show in November 1983, and marketed from March 1984 Aprilia was now moving forward to the limit in this category: more powerful and more beautiful than the ST 125 from which it derives directly, the STX immediately became a bestseller.


The STX immediately presents itself as more mature and not only for the presence of the windshield and front toe. The pearl white with red and black inserts is certainly modern and the comfortable saddle is now enhanced with the Aprilia logo on both sides. The oil tank is immediately in front of the headstock and the plug is easily accessible, being located just before the petrol cap.

The instrumentation is the same as with the ST. The electric controls are now Italian (CEV) manufactured, although, in the opinion of the writer, are perhaps a little less pleasant than the Magura previously installed on the TS.

Engine

The ST's Hiro engine remains virtually unchanged. According to data collected at the time, it gain in terms of power output is about 0.5hp or 18.48hp at 8500rpm instead of 18.07hp to 8250rpm. Not bad considering the limited interventions and the fact that the mixer "eats" a little more 'power.

More radical, however, assistance where all transmission gear ratios have been lengthened and decreased the secondary reduction ratio and in sixth, from 1:8.04 to 1:7.77; the maximum speed however, due to increased power and new gear ratios increased from 126.8 to 129.7 km / hour.

 

 

 

 

 

 



 

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