1986

RX 125 (reduced effect)

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MotoLibrary Score

38 /100 Commuter

Power

9 HP

Top Speed

130 km/h

Engine

124 ccm

Technical Overview

1986 Aprilia RX 125 (reduced effect) Technical Analysis & Specification Breakdown

Built around Aprilia's motorcycle platform, the 1986 Aprilia RX 125 (reduced effect) features a 124 cc (7.6 cu in) liquid-cooled single cylinder, two-stroke configuration. In factory specification, peak output is rated at 9 HP (6.6 kW) at 7,000 rpm, transferring power to the rear wheel through a 6-speed gearbox and chain final drive. With a specific output of 72.6 HP per liter, the engine character is indicating a tractable, stress-free state of tune focused on everyday usability and broad torque delivery.

On the scales, the RX 125 (reduced effect) measures 91 kg (201 lbs) wet (curb), translating to a power-to-weight ratio of 0.1 HP/kg (10.11 kg per horsepower). The 8.5-liter (2.2 US gal) fuel tank supports practical everyday commuting and weekend road stints, while factory top speed is listed at 130 km/h (81 mph).

Specific Output

72.6 HP/L

Power-to-Weight

0.1 HP/kg (10.11 kg/HP)

Engine

Displacement 124.0 ccm (7.57 cubic inches)

Engine Type Single cylinder, two-stroke

Engine Details Single cylinder, two-stroke

Power 9.0 HP (6.6 kW)) @ 7000 RPM

Compression 14.5:1

Bore x Stroke 54.0 x 54.0 mm (2.1 x 2.1 inches)

Fuel Control Membrane

Cooling Liquid

Transmission

Gearbox 6-speed

Final Drive Chain (final drive)

Performance

Top Speed 130.0 km/h (80.8 mph)

Wheels & Brakes

Front Tyre 3.00-21

Rear Tyre 4.00-18

Front Brakes Single disc

Rear Brakes Expanding brake

Dimensions & Weight

Weight incl. 91.0 kg (200.6 pounds)

Fuel Capacity 8.50 litres (2.25 US gallons)

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Power

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Transmission

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Beginner

A2 license compatible, manageable power.

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